Ashton S. Bradley and Brian P. Anderson
Phys. Rev. X 2, 041001 (2012) - Published 4 October, 2012
Theoretical analysis of a confined turbulent quantum fluid reveals features of the clustering of quantized vortices and permits a new way to compute the Kolmogorov constant, which captures the nature of energy flow across different length scales.
Netanel H. Lindner, Erez Berg, Gil Refael, and Ady Stern
Phys. Rev. X 2, 041002 (2012) - Published 11 October, 2012
Theoretical investigations of hybrid systems of fractional quantum Hall states and superconductors lead to the prediction of fractional Majorana fermions – a novel type of exotic, non-Abelian particles.
Austin G. Fowler, Adam C. Whiteside, Angus L. McInnes, and Alimohammad Rabbani
Phys. Rev. X 2, 041003 (2012) - Published 17 October, 2012
A powerful software-based tool transforms the so-far extremely laborious task of optimizing real quantum-computing hardware for topological error correction into a highly automated and efficient one for a broad range of hardware platforms.
A. G. R. Thomas, C. P. Ridgers, S. S. Bulanov, B. J. Griffin, and S. P. D. Mangles
Phys. Rev. X 2, 041004 (2012) - Published 19 October, 2012
Experiments exploring the collision of a high-intensity laser beam with an electron beam are within the reach of modern laser technology. New fundamental insights into the quantum electrodynamic process of photon emission from accelerating electrons and a new type of gamma-ray sources may emerge from these soon-to-be-realized experiments.
Jean Carlos Perez, Joanne Mason, Stanislav Boldyrev, and Fausto Cattaneo
Phys. Rev. X 2, 041005 (2012) - Published 25 October, 2012
Large-scale, record-resolution numerical magnetohydrodynamic simulations significantly advance the debate on the nature of strong turbulence in astrophysical plasmas.
Michael J. W. Hall and Howard M. Wiseman
Phys. Rev. X 2, 041006 (2012) - Published 25 October, 2012
A quantum-information theoretical approach explores the potential and the limit of a newly emerging direction of precision quantum measurements that exploits nonlinear interactions between probe photons.
Michael Monteforte and Fred Wolf
Phys. Rev. X 2, 041007 (2012) - Published 1 November, 2012
Can a single neuronal spike in 100 billion spikes affect information processing in the human brain? Monteforte and Wolf from Max-Planck Institute for Dynamics and Self-organization show that the answer is “yes” and also reveal how that comes about with a novel concept of nonlinear dynamics.
Andreas Mann, Jakob Walowski, Markus Münzenberg, Stefan Maat, Matthew J. Carey, Jeffrey R. Childress, Claudia Mewes, Daniel Ebke, Volker Drewello, Günter Reiss, and Andy Thomas
Phys. Rev. X 2, 041008 (2012) - Published 15 November, 2012
A series of experiments on a judicious selection of magnetic materials using ultrafast laser pulses demonstrate successful control of spin polarization and ultrafast spin dynamics in the materials through their electronic structures.
B. J. Wundt, C. T. Munger, and U. D. Jentschura
Phys. Rev. X 2, 041009 (2012) - Published 16 November, 2012
Does the electron have a nonzero electric dipole moment? Measurements based on an atomic-fountain apparatus are predicted to be able to answer this question more accurately by lowering the current experimental detection limits by two orders of magnitude.
K. A. Patel, J. F. Dynes, I. Choi, A. W. Sharpe, A. R. Dixon, Z. L. Yuan, R. V. Penty, and A. J. Shields
Phys. Rev. X 2, 041010 (2012) - Published 20 November, 2012
A group at Toshiba Research succeed in sending quantum encryption keys over record distances on high-traffic optical fibers, taking a big step toward quantum communication on a practical scale.
Konstantin Y. Bliokh, Peter Schattschneider, Jo Verbeeck, and Franco Nori
Phys. Rev. X 2, 041011 (2012) - Published 26 November, 2012
With their spiraling wavefronts, orbital angular momentum, and capability of interacting with applied magnetic fields, electron vortex beams make it possible to directly observe fundamental properties of quantum states of electrons in fields under an electron microscope.
Tanmoy Das, Tomasz Durakiewicz, Jian-Xin Zhu, John J. Joyce, John L. Sarrao, and Matthias J. Graf
Phys. Rev. X 2, 041012 (2012) - Published 27 November, 2012
Combined state-of-the-art experimental and theoretical investigations of a strongly correlated electronic material point to spin fluctuations as the prime mechanism for “dressing” electrons.
Philippe Corboz, Miklós Lajkó, Andreas M. Läuchli, Karlo Penc, and Frédéric Mila
Phys. Rev. X 2, 041013 (2012) - Published 27 November, 2012
Multi-approach theoretical investigation of a minimal model of spin and orbital degrees of freedom of electrons in metal oxides yields the strongest evidence to date for the existence of a spin-orbital liquid down to the lowest temperature possible.
A. M. Kaufman, B. J. Lester, and C. A. Regal
Phys. Rev. X 2, 041014 (2012) - Published 29 November, 2012
Individual, neutral atoms trapped in optical tweezers have been cooled to their quantum ground state, raising hopes that they can be used to process quantum information.
Jon J. Papini, Jeppe C. Dyre, and Tage Christensen
Phys. Rev. X 2, 041015 (2012) - Published 29 November, 2012
When a bulk piece of material is heated at its surface, does its center become hotter or cooler? A Danish group predict theoretically, and confirm experimentally that, when heated at its surface, a supercooled viscoelastic glucose ball actually cools down at its center.
Sven Jahnke, Marc Timme, and Raoul-Martin Memmesheimer
Phys. Rev. X 2, 041016 (2012) - Published 13 December, 2012
Recent single-neuron experiments have revealed that neurons are capable of fast, nonadditive summation of synchronously received inputs. Incorporating this nonadditive neuronal coupling into theoretical models of cortical networks opens up a new direction for exploring guided neuronal synchrony – a process thought to be essential for cognitive functions such as memory, thought, and language.
A. Varykhalov, D. Marchenko, J. Sánchez-Barriga, M. R. Scholz, B. Verberck, B. Trauzettel, T. O. Wehling, C. Carbone, and O. Rader
Phys. Rev. X 2, 041017 (2012) - Published 20 December, 2012
A photoemission study of the electronic structure of a single graphene layer on nickel shows that the electrons in the graphene layer with a broken lattice symmetry still move like massless particles, contrary to what is expected.
Mahito Yamamoto, Olivier Pierre-Louis, Jia Huang, Michael S. Fuhrer, Theodore L. Einstein, and William G. Cullen
Phys. Rev. X 2, 041018 (2012) - Published 26 December, 2012
A nanophysics tale of “The Princess and the Pea” reenacted with graphene sheets, SiO nanoparticles, and an atomic force microscope provides a way to a deeper understanding of graphene’s mechanical properties and extends the realm of thin-sheet mechanics to the nanoscale limit.
Alex Hayat, Parisa Zareapour, Shu Yang F. Zhao, Achint Jain, Igor G. Savelyev, Marina Blumin, Zhijun Xu, Alina Yang, G. D. Gu, Harry E. Ruda, Shuang Jia, R. J. Cava, Aephraim M. Steinberg, and Kenneth S. Burch
Phys. Rev. X 2, 041019 (2012) - Published 27 December, 2012
Using a novel mechanical-bonding technique, a team of physicists at University of Toronto realize for the first time hybrid tunnel diodes composed of a high-temperature superconductor and a second material that is either a bulk semiconductor, a semiconductor quantum well, or a topological insulator.
Michael Knap, Aditya Shashi, Yusuke Nishida, Adilet Imambekov, Dmitry A. Abanin, and Eugene Demler
Phys. Rev. X 2, 041020 (2012) - Published 27 December, 2012
Expanding the reach of the field of ultracold atoms, a comprehensive and practical proposal describes how a range of new experiments on ultracold fermions can explore impurity-induced quantum dynamics–a classical topic in condensed matter physics that has seen very limited experimental observations.
Earl T. Campbell, Hussain Anwar, and Dan E. Browne
Phys. Rev. X 2, 041021 (2012) - Published 27 December, 2012
Fault-tolerant quantum-computation schemes employing multi-level quantum systems (qudits) instead of two-level systems (qubits) are shown to offer significant advantages over their existing qubit counterparts, including a potential one-millionfold resource saving in device memory.
S. M. Griffin, M. Lilienblum, K. T. Delaney, Y. Kumagai, M. Fiebig, and N. A. Spaldin
Phys. Rev. X 2, 041022 (2012) - Published 27 December, 2012
The behavior of the electric-polarization vortices generated by the ferroelectricity transition in solid-state materials of hexagonal manganites provides the first unambiguous experimental demonstration of the Kibble-Zurek mechanism that unifies our understanding of topological-defect generation in many subfields of physics.