We propose an improved scheme to do the time-dependent variational principle (TDVP) in finite matrix product states (MPSs) for two-dimensional systems or one-dimensional systems with long-range interactions. We present a method to represent the time-evolving state in a MPS with its basis enriched by state averaging with global Krylov vectors. We show that the projection error is significantly reduced so precise time evolution can still be obtained even if a larger time step is used. Combined with the one-site TDVP, our approach provides a way to dynamically increase the bond dimension while still preserving unitarity for real-time evolution. Our method can be more accurate and exhibit slower bond dimension growth than the conventional two-site TDVP.

We investigate the low-frequency charge-carrier dynamics of a molecular dimer-Mott insulator ${\beta }^{\prime }-{(\mathrm{BEDT}-\mathrm{TTF})}_2{\mathrm{ICl}}_2$, where the freezing of charge fluctuations on the dimers gives rise to electronic ferroelectricity. We show that conductance fluctuation (noise) spectroscopy allows one to probe changes in the dielectric properties at elevated temperatures, where samples are even still in the conductive regime. Our results explain the formation of electric polarization states leading to glassy and relaxor-type ferroelectric behavior that is frequently observed in these systems. The onset of distinct two-level fluctuations and changes of the underlying $1/f$-type noise indicate the formation of nanoscale polar regions, the dynamics of which depends on the applied electric fields. Conductance noise spectroscopy therefore is a suitable tool for investigating the onset of electric-polarization dynamics in molecular and other, inorganic charge-driven ferroelectrics.

Scanning tunneling microscopy and spectroscopy are utilized to study the atomic-scale structure and electronic properties of infinite-layer ${\mathrm{Sr}}_{0.94}{\mathrm{La}}_{0.06}\mathrm{Cu}{\mathrm{O}}_{2+y}$ films prepared on $\mathrm{Sr}\mathrm{Ru}{\mathrm{O}}_3$-buffered $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_3$(001) substrate by ozone-assisted molecular beam epitaxy. Incommensurate structural supermodulation with a period of 24.5 $\text{Å}$ is identified on the $\mathrm{Cu}{\mathrm{O}}_2$-terminated surface, leading to characteristic stripes running along the ${45}^{\text{o}}$ direction with respect to the Cu-O-Cu bonds. Spatially resolved tunneling spectra reveal substantial inhomogeneity on a nanometer-length scale and emergence of in-gap states at sufficient doping. Despite the Fermi level shifting up to 0.7 eV, the charge-transfer energy gap of the $\mathrm{Cu}{\mathrm{O}}_2$ planes remains fundamentally unchanged at different doping levels. The occurrence of the $\mathrm{Cu}{\mathrm{O}}_2$ superstructure is constrained in the surface region and its formation is found to link with oxygen intake that serves as the doping agent of holes in the epitaxial films.

We explore the structural evolution of highly oriented pyrolytic graphite (HOPG) under detonation-induced shock conditions using in situ synchrotron x-ray diffraction in the ns timescale. We observe the formation of hexagonal diamond (lonsdaleite) at pressures above 50 GPa, in qualitative agreement with recent gas gun experiments. First-principles density functional calculations reveal that under uniaxial compression, the energy barrier for the transition toward hexagonal diamond is lower than that for cubic diamond. Finally, no indication of cubic diamond formation was observed up to $>70$ GPa.

Ferroelastic $\mathrm{La}\mathrm{Al}{\mathrm{O}}_3$ (space group $R\overline{3}c$) exists with two different microstructures: twins and tweed. Both microstructures contain electrical dipole moments. Polarity inside ferroelastic twin walls has been shown using two complementary experimental techniques and identical samples. PFM reveals a weak piezoelectric effect at the loci of the domain walls. In tweed samples, the PFM signal is finite but variable in the entire sample. PFM shows that same characteristic tweed microstructure as observed optically. The piezoelectric effect is of a similar magnitude inside twin walls and, space averaged, in the tweed microstructure (and approximately one order of magnitude smaller than in $c$-oriented $\mathrm{Pb}\mathrm{Ti}{\mathrm{O}}_3$ single crystals). Resonance piezoelectric spectroscopy proves that domain walls vibrate under the application of an external driving electric field. The resonance frequency is very close to stress induced vibrations. This is evidence for weak but finite coupling between the local dipole moments in the domain walls and the external electric field. The same coupling and the piezoelectric response are much stronger in the tweed sample. Symmetry breaking by dipolar vectors in a $\mathrm{La}\mathrm{Al}{\mathrm{O}}_3$ sample with tweed has been confirmed by the observation of optical second harmonic signals. The noncentrosymmetric point group is identified as $3m$ in agreement with earlier work on twinned $\mathrm{La}\mathrm{Al}{\mathrm{O}}_3$ but in contradiction with predictions of Landau-Ginzburg theory of simple ferroelastic wall structures.

The discovery of alternating superconducting and insulating ground states in magic angle graphene has suggested an intriguing analogy with cuprate high-$T_c$ materials. Here we argue that the network states of small angle twisted bilayer graphene (TBG) afford a further perspective on the cuprates by emulating their stripe-ordered phases, as in ${\mathrm{La}}_{1.875}{\mathrm{Ba}}_{0.125}{\mathrm{CuO}}_4$. We show that the spin and valley quantum numbers of stripes in TBG graphene fractionalize, developing characteristic signatures in the tunneling density of states and the magnetic noise spectrum of impurity spins. By examining the coupling between the charge rivers we determine the superconducting transition temperature. Our study suggests that twisted bilayer graphene can be used for a controlled emulation of stripe superconductivity and quantum sensing experiments of emergent anyonic excitations.

We report electron transport studies in an encapsulated few-layer $\mathrm{W}{\mathrm{Te}}_2$ at low temperatures and high magnetic fields. The magnetoconductance reveals a temperature-induced crossover between weak antilocalization and weak localization in the quantum diffusive regime. We show that the crossover clearly manifests coexistence and competition among several characteristic lengths, including the dephasing length, the spin-flip length, and the mean free path. In addition, low-temperature conductance increases logarithmically with the increase of temperature indicating an interplay of electron-electron interaction (EEI) and spin-orbit coupling (SOC). We demonstrate the existence and quantify the strengths of EEI and SOC which are considered to be responsible for gap opening in the quantum spin Hall state in $\mathrm{W}{\mathrm{Te}}_2$ at the monolayer limit.

The origin of the two-dimensional electron system (2DES) appearing at the (001) interface of band insulators ${\mathrm{SrTiO}}_3$ and ${\mathrm{LaAlO}}_3$ has been rationalized in the framework of a polar catastrophe scenario. This implies the existence of a critical thickness of polar ${\mathrm{LaAlO}}_3$ overlayer ($4\mathrm{u}.\mathrm{c}.$) for the appearance of the 2DES: a polar catastrophe for thick ${\mathrm{LaAlO}}_3$ overlayer is avoided either through a Zener breakdown or a stabilization of donor defects at the ${\mathrm{LaAlO}}_3$ surface, both providing electrons to dope the substrate. The observation of a critical thickness is observed in experiments, supporting these hypotheses. Yet, there remains an open debate about which of these possible mechanisms actually occurs first. Using hybrid functional density functional theory, we re-examine these mechanisms at the same level of approximation. Particularly, we clarify the role of donor defects in these heterostructures and argue that, under usual growth conditions, electric-field driven stabilization of oxygen vacancies and hydrogen adsorbates at the LAO surface occurs at a smaller LAO thickness than required for the Zener breakdown.

A recent modification, $\mathrm{r}{}^2\mathrm{SCAN}$, of the strongly constrained and appropriately normed (SCAN) meta-generalized gradient approximation (GGA) exchange-correlation functional mostly eliminates numerical instabilities and attendant integration grid sensitivities exhibited by SCAN. Here, we show that the successful deorbitalization of SCAN to SCAN-L (SCAN with density Laplacian dependence) carries over directly to yield $\mathrm{r}{}^2\mathrm{SCAN}$-L. A major benefit is that the high iteration counts that hindered the use of SCAN-L are eliminated in $\mathrm{r}{}^2\mathrm{SCAN}$-L. It therefore is a computationally much faster meta-GGA than its orbital-dependent antecedent. Validation data for molecular heats of formation, bond lengths, and vibration frequencies (G3/99X, T96-R, and T82-F test sets, respectively) and on lattice constants, and cohesive energies (for 55 solids) and bulk moduli (for 40 solids) are provided. In addition, we show that the overmagnetization of bcc Fe, hcp Co, and fcc Ni persists in $\mathrm{r}{}^2\mathrm{SCAN}$ but does not appear in $\mathrm{r}{}^2\mathrm{SCAN}$-L. Distinct from SCAN, both $\mathrm{r}{}^2\mathrm{SCAN}$ and $\mathrm{r}{}^2\mathrm{SCAN}$-L give the correct nonmagnetic ground state for bcc V.

We calculate the lattice thermal conductivities of the pyrite-type $\mathrm{Zn}{\mathrm{Se}}_2$ at pressures of 0 and 10 GPa by using the linearized phonon Boltzmann transport equation. We obtain a very low value (0.69 W/mK at room temperature at 0 GPa), comparable to the best thermoelectric materials. The vibrational spectrums are characterized by the isolated high-frequency optical phonon modes due to the stretching of Se-Se dimers and the low-frequency optical phonon modes with a strong anharmonicity due to the rattling modes of Zn atoms, especially the rotations of Zn atoms around these dimers. This means that the existence of localized Se-Se dimers leads to the strong anharmonicity of the low-frequency optical phonon modes. Interestingly, two transverse acoustic phonon modes with similar frequencies and wave vectors have very different degrees of anharmonicity. We show that the anharmonicities of the transverse acoustic phonon modes are connected to the corresponding changes in the pyrite parameters. Furthermore, to determine the thermoelectric performances of $\mathrm{Zn}{\mathrm{Se}}_2$, we also investigate its electrical transport properties. Our results show that both $p$-type and $n$-type $\mathrm{Zn}{\mathrm{Se}}_2$ can possess promising electrical transport properties contributed by the complex energy isosurfaces of both valence and conduction bands. The low thermal conductivities and promising electrical transport properties lead to a large thermoelectric figure of merit of $\mathrm{Zn}{\mathrm{Se}}_2$ for both $p$-type and $n$-type doping at different pressures. Our study reveals the effect of the localized nonmetallic dimers on the anharmonicity and lattice thermal conductivity in the pyrite-type compound, which can be used to guide researchers to seek promising thermoelectric materials containing nonmetallic dimers.

We present a time-dependent microscopic model for Coulomb blockade transport through an experimentally realized supramolecular spin-valve device driven by an oscillating magnetic field, in which the $4f$-electron magnetic states of an array of $\mathrm{Tb}{\mathrm{Pc}}_2$ single-molecule magnets (SMMs) were observed to modulate a sequential tunneling current through an underlying substrate nanoconstriction. Our model elucidates the dynamical mechanism at the origin of the observed hysteresis loops of the magnetoconductance, a signature of the SMM-modulated spin-valve effect, in terms of a phonon-assisted multi-spin-reversal cascade relaxation process, which mediates the switching of the device between the two conductive all-parallel spin configurations of the SMM array. Moreover, our proposed model can explain the zero-bias giant magnetoresistive transport gap measured in this device, solely within the incoherent transport regime, consistently with the experimental observations, as opposed to previous interpretations invoking Fano-resonance conductance suppression within a coherent ballistic transport regime. Finally, according to the proposed Coulomb blockade scenario, the SMM-mediated giant magnetoresistance effect is predicted to increase with the number of SMMs aligned on the nanoconstriction surface, on account of the increased number of intermediate nonconducting spin-flip states intervening in the phonon-assisted multi-spin-reversal cascade relaxation process necessary to switch between the two conducting all-parallel SMM spin configurations.

Dielectric relaxation experiments performed at ambient and elevated pressures P in molecular, ionic, and polymeric glass formers have established that the relation of the Johari-Goldstein (JG) β-relaxation time ${\tau }_{\beta }\left(T,P\right)$ to the α-relaxation time ${\tau }_{\alpha }\left(T,P\right)$ is invariant to changes of T and P while the latter is kept constant. This property of the JG β relaxation is remarkable despite the fact that the invariance of the ratio ${\tau }_{\beta }\left(T,P\right)/{\tau }_{\alpha }\left(T,P\right)$ from experiment is sometimes approximate because the β relaxation is composed of a distribution of processes, and the ${\tau }_{\beta }\left(T,P\right)$ determined can be arbitrary. The property indicates the fundamental importance of the JG β relaxation and it cannot be neglected whenever the α relaxation is considered. Notwithstanding, the property has not been checked on whether it applies to metallic glasses. Conventional experiment techniques cannot fulfill the task, and the alternative is molecular dynamics simulations. In this paper we report the results of molecular dynamics simulations of dynamical mechanical spectroscopy performed on two very different metallic glasses, $\mathrm{Z}{\mathrm{r}}_{50}\mathrm{C}{\mathrm{u}}_{50}$ and $\mathrm{N}{\mathrm{i}}_{80}{\mathrm{P}}_{20}$, at different pressures P. The JG β relaxation appears as an excess wing on the low-temperature side of the α loss peak at $T_{\alpha ,P}$ in the isochronal loss modulus spectra ${E_P}^{″}\left(T\right)$. On the other hand, the isochronal non-Gaussian parameter $\alpha 2_P\left(T\right)$ peaks at the temperature $T_{\alpha 2,P}$ different from $T_{\alpha ,P}$ of ${E^{″}}_P\left(T\right)$. From the fact that $T_{\alpha 2,P}$ is significantly lower than $T_{\alpha ,P}$, we identified the peak temperature $T_{\alpha 2,P}$ of $\alpha 2_P\left(T\right)$ with the JG β relaxation, and hence the JG β relaxation is fully resolved by studying the isochronal non-Gaussian parameter $\alpha 2_P\left(T\right)$. After scaling temperature by $T_{\alpha ,P}$, the normalized ${E_P}^{″}(T/T_{\alpha ,P})$ and $\alpha 2_P(T/T_{\alpha ,P})$ both show superposition of data taken at various pressures for all $T/T_{\alpha ,P}$ covering the JG β relaxation and the α relaxation. Moreover the ratio $T_{\alpha 2,P}/T_{\alpha ,P}$ is invariant to changes of T and P while ${\tau }_{\alpha }\left(T,P\right)$ is maintained constant. Thus we have verified for two different metallic glasses, $\mathrm{Z}{\mathrm{r}}_{50}\mathrm{C}{\mathrm{u}}_{50}$ and $\mathrm{N}{\mathrm{i}}_{80}{\mathrm{P}}_{20}$, that ${\tau }_{\alpha }\left(T,P\right)/{\tau }_{\beta }\left(T,P\right)$ is invariant to changes of T and P at constant ${\tau }_{\alpha }\left(T,P\right)$, as found in soft matter.

Photonic pseudospin-$\frac{1}{2}$ systems which exhibit Dirac cone dispersion at Brillouin zone corners in analogy to graphene, have been extensively studied in recent years. However, it is known that a linear band crossing of two bands cannot emerge at the center of a Brillouin zone in a two-dimensional photonic system respecting time-reversal symmetry. Using a square lattice of elliptical magneto-optical cylinders, we constructed an unpaired Dirac point at the Brillouin zone center as the intersection of the second and third bands corresponding to the monopole and dipole excitations. Effective medium theory can be applied to the two linearly crossed bands with the effective constitutive parameters numerically calculated using the boundary effective medium approach. It is shown that only the effective permittivity approaches zero, while the determinant of the nonzero effective permeability vanishes at the Dirac point frequency, showing a different behavior from the double-zero-index metamaterials obtained from the pseudospin-1 triply degenerate points for time-reversal symmetric systems. Exotic phenomena, such as the Klein tunneling and Zitterbewegung, in the pseudospin-$\frac{1}{2}$ system can be well understood from the effective medium description. When the Dirac point is lifted, the edge-state dispersion near the Γ point can be accurately predicted by the effective constitutive parameters. We also further realized magneto-optical complex conjugate metamaterials for a wide frequency range by introducing a particular type of non-Hermitian perturbations which make the two linear bands coalescence to form exceptional points at the real frequency.

Coherent phonon-polaritons have attracted a considerable amount of interest owing to their relevance to nonlinear optics and terahertz (THz)-wave emissions. Therefore, it is important to analyze the THz electric fields of phonon-polaritons. However, in the majority of previous measurements, only a single component of the THz electric field was detected. In this paper, we demonstrate that pump-probe electro-optical imaging measurements using the Stokes parameters of probe polarization enable the phase-resolved selective detection of THz electric-field components that are associated with the phonon-polariton. We experimentally distinguish the mode profiles of ordinary and extraordinary phonon-polaritons, and clarify the excitation mechanism as optical rectification. These results are explained by numerical calculations of Maxwell equations for the THz electric field. The technique of selectively observing the THz electric field components may be useful for designing efficient THz-wave emitters.

We use first-principles calculations combined with self-consistent phonon (SCP) theory, electron-phonon ($e-ph$) coupling, and the Boltzmann transport equation (BTE) to investigate the electronic and thermoelectric transport properties in the cubic ${\mathrm{Rb}}_3\mathrm{AuO}$ antiperovskite with strongly cubic and quartic lattice anharmonicity. The combination of SCP theory and Wannier-Fourier interpolation is used to calculate the $e-ph$ coupling due to the failure of density functional perturbation theory in solving $e-ph$ matrix elements for a strongly anharmonic crystal. Our results exhibit that a high electron mobility ${\mu }_e$, e.g., $\sim 454{\mathrm{cm}}^2/\mathrm{Vs}$ at $300\mathrm{K}$ from the iterative BTE solution, and a relatively weak temperature dependence of ${\mu }_e\propto T^{-1.1}$ are obtained in the $n$-type cubic ${\mathrm{Rb}}_3\mathrm{AuO}$. We demonstrate that the coupling between electrons and polar optical phonons is responsible for the good charge transport, which, along with the high thermopower deriving from a light and threefold degenerate conduction-band pocket around the $X$ point, leads to a very high power factor reaching $5.5\mathrm{mW}/{\mathrm{mK}}^2$ at $800\mathrm{K}$. Meanwhile, a low lattice thermal conductivity and an undersized Lorenz number that signifies a resulting low electron thermal conductivity are also detected. As a result, a good thermoelectric performance with a figure of merit $ZT\sim 1.02$ at $300\mathrm{K}$ and an anomalously high $ZT\sim 3.02$ at $800\mathrm{K}$ is captured in the $n$-type cubic ${\mathrm{Rb}}_3\mathrm{AuO}$. This finding breaks the long-term record of $ZT<3$ in most of the reported bulk thermoelectric materials to date, and illustrates that the cubic ${\mathrm{Rb}}_3\mathrm{AuO}$ is an excellent candidate for thermoelectric applications.

Recently, ${\mathrm{HoB}}_2$ was discovered to undergo a gigantic magnetic entropy change; the largest $|\mathrm{\Delta }{S}_M|=40.1\mathrm{J}{\mathrm{kg}}^{-1}{\mathrm{K}}^{-1}$ ($0.35\mathrm{J}{\mathrm{cm}}^{-3}{\mathrm{K}}^{-1}$) in magnetocaloric materials studied for hydrogen liquefaction [P. Baptista de Castro et al., NPG Asia Mater. 12, 35 (2020)]. In this study, in order to investigate the origin of the gigantic $|\mathrm{\Delta }{S}_M|$ in ${\mathrm{HoB}}_2$, we studied the magnetic orderings by neutron diffraction with an enriched powder sample of ${\mathrm{Ho}}^{11}{\mathrm{B}}_2$. Our experimental results showed the onset of ferromagnetic long-range order below $T_C=15\mathrm{K}$. For the second phase transition at $T_2=11\mathrm{K}$, the spin reorientation occurs, and the temperature dependence of the total magnetic moment of ${\mathrm{Ho}}^{3+}$ shows a kink anomaly, which is typically seen in compounds with quadrupolar ordering. In addition, the temperature dependence of the ferromagnetic short-range order above $T_C$ is strongly related to that of the magnetic entropy change in ${\mathrm{HoB}}_2$. These results infer that the gigantic $|\mathrm{\Delta }{S}_M|$ in ${\mathrm{HoB}}_2$ is caused by (i) the spin reorientation transition, which is likely associated with quadrupolar ordering, giving the additional contribution to $|\mathrm{\Delta }{S}_M|$ at the lower phase transition temperature, $T_2=11\mathrm{K}$, and (ii) the large FM fluctuation above $T_C$ with origins in the strong suppression of the FM long-range order.

We have devised an experimental study to explore the vector nature of the dynamic order parameter $Q$ and the corresponding dynamic fluctuation ${\mathit{\sigma }}^Q$ and susceptibility ${\mathit{\chi }}^Q$ tensors in the vicinity of the dynamic phase transition (DPT). For this purpose, we have fabricated epitaxial Co and CoRu thin films with ($10\underline{1}0$) surface orientation and associated in-plane uniaxial anisotropy to mimic the behavior of an anisotropic Heisenberg model in the absence of magnetostatic interactions. Specifically, we measured the time-dependent magnetization component parallel to the externally applied magnetic field for different orientations of the magnetic easy axis (EA) while exploring the dynamic phase space defined by the applied oscillatory field amplitude $H_0$ and an additionally applied time-independent bias field $H_b$. The magnetization dynamics was hereby observed by utilizing an ultrasensitive transverse magneto-optical Kerr effect setup that allowed for real-time observations of the magnetic state evolution. Our experimental results demonstrate that while the position of the critical point changes upon rotating the EA away from the field axis, all qualitative aspects of the dynamic phase diagram close to the critical point are unchanged and the DPT can be universally observed. Also, metamagnetic anomalies occur for all measurement conditions. All our results are in agreement with a domain nucleation initiated magnetization reversal process and indicate that the overall dynamic state is dominated by the magnetization component parallel to the EA, so that a change in orientation in between the field axis and EA leads to a rather trivial rotation of the $Q$ vector, which simply follows the EA.

We consider a microscopic theory for the spin Hall magnetoresistance (SMR). We generally formulate a spin conductance at an interface between a normal metal and a magnetic insulator in terms of spin susceptibilities. We reveal that SMR is composed of static and dynamic parts. The static part, which is almost independent of the temperature, originates from spin flip caused by an interfacial exchange coupling. However, the dynamic part, which is induced by the creation or annihilation of magnons, has an opposite sign from the static part. By the spin-wave approximation, we predict that the latter results in a nontrivial sign change in the SMR signal at a finite temperature. In addition, we derive the Onsager relation between spin conductance and thermal spin-current noise.

β-W and β-Ta are well known for their large spin Hall angles (SHAs), while α-W and α-Ta possess small SHAs. Recent theoretical studies predicted that alloying Ta with W could enhance the SHA. In this work, a systematic study is performed on the spin Hall effect (SHE) in $\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$ alloys in the full composition range from $x=0$ to 1. We have obtained the structural phase diagram and SHAs of the α- and $\beta \text{−}\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$ alloy system, based on x-ray-diffraction, transmission electron microscopy, magnetotransport measurement, and macrospin model analysis. We have observed large SHAs ranging from −0.06 to −0.23 in $\alpha \text{−}\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$ and a maximum SHA of −0.59 in 5.3-nm-thick $\beta \text{−}\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$. In addition, a linear correlation between SHA and resistivity in $\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$ has been uncovered, providing evidence that the SHE in $\mathrm{T}{\mathrm{a}}_x{\mathrm{W}}_{1\text{−}x}$ is caused by the intrinsic mechanism and/or side-jump scattering. Furthermore, we have observed an unconventional thickness dependence of SHA in $\beta \text{−}\mathrm{T}{\mathrm{a}}_{0.25}{\mathrm{W}}_{0.75}$, which peaks at 5.3 nm. The decay of SHA upon increasing thickness is likely to be caused by the β- to α-phase transition.

Real-space modulated charge density waves (CDW) are a ubiquitous feature in many families of superconductors. In particular, how CDW relates to superconductivity is an active and open question that has recently gathered much interest since CDWs have been discovered in many cuprates superconductors. Here we show that disorder induced by proton irradiation is a full-fledged tuning parameter that can bring essential information to answer this question as it affects CDW and superconductivity with different and unequivocal mechanisms. Specifically, in the model CDW superconductor ${\mathrm{Lu}}_5{\mathrm{Ir}}_4{\mathrm{Si}}_{10}$ that develops a 1D CDW below 77 K and s-wave superconductivity below 4 K, we show that disorder enhances the superconducting critical temperature $T_{\mathrm{c}}$ and $H_{\mathrm{c}2}$ while it suppresses the CDW. Discussing how disorder affects both superconductivity and the CDW, we make a compelling case that superconductivity and CDW are competing for electronic density of states at the Fermi level in ${\mathrm{Lu}}_5{\mathrm{Ir}}_4{\mathrm{Si}}_{10}$, and we reconcile the results obtained via the more common tuning parameters of pressure and doping. Owing to its prototypical, 1D, Peierls type CDW and the s-wave, weak-coupling nature of its superconductivity, this irradiation study of ${\mathrm{Lu}}_5{\mathrm{Ir}}_4{\mathrm{Si}}_{10}$ provides the basis to understand and extend such studies to the more complex cases of density waves and superconductivity coexistence in heavy fermions, Fe-based, or cuprates superconductors.