Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe)<math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mrow></mrow><mrow><mn>1.14</mn></mrow></msub><msub><mi>NbSe</mi><mn>2</mn></msub></math>

Haoyuan Zhong; Hongyun Zhang; Haoxiong Zhang; Ting Bao; Kenan Zhang; Shengnan Xu; Laipeng Luo; Awabaikeli Rousuli; Wei Yao; Jonathan D. Denlinger; Yaobo Huang; Yang Wu; Yong Xu; Wenhui Duan; Shuyun Zhou

doi:10.1103/PhysRevMaterials.7.L041801

Letter

Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe) $_{1.14} {NbSe}_{2}$

Haoyuan Zhong ^1,*, Hongyun Zhang ^1,*, Haoxiong Zhang^1,*, Ting Bao¹, Kenan Zhang¹, Shengnan Xu¹, Laipeng Luo¹, Awabaikeli Rousuli¹, Wei Yao¹ et al.

Jonathan D. Denlinger², Yaobo Huang ³, Yang Wu^4,5, Yong Xu^1,6, Wenhui Duan ^1,6, and Shuyun Zhou ^1,6,†

¹State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
³Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, People's Republic of China
⁴Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, People's Republic of China
⁵College of Math and Physics, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
⁶Frontier Science Center for Quantum Information, Beijing 100084, People's Republic of China

^*These authors contributed equally to this work
^†Corresponding author: syzhou@mail.tsinghua.edu.cn

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Phys. Rev. Materials 7, L041801 – Published 26 April, 2023

DOI: https://doi.org/10.1103/PhysRevMaterials.7.L041801

Abstract

Van der Waals superlattices are important for tailoring the electronic structures and properties of layered materials. Here we report the superconducting properties and electronic structure of a natural van der Waals superlattice ( ${PbSe)}_{1.14} {NbSe}_{2}$ . Anisotropic superconductivity with a transition temperature $T_{c}$ = 5.6 $\pm$ 0.1 K, which is higher than monolayer ${NbSe}_{2}$ , is revealed by transport measurements on high-quality samples. Angle-resolved photoemission spectroscopy (ARPES) measurements reveal the two-dimensional electronic structure and a charge transfer of 0.43 electrons per ${NbSe}_{2}$ unit cell from the blocking PbSe layer. In addition, polarization-dependent ARPES measurements reveal a significant circular dichroism with opposite contrast at K and $K^{'}$ valleys, suggesting a significant spin-orbital coupling and distinct orbital angular momentum. Our work suggests natural van der Waals superlattice as an effective pathway for achieving intriguing properties distinct from both the bulk and monolayer samples.

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Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe) $_{1.14} {NbSe}_{2}$

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Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe)1.14NbSe2

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Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe) $_{1.14} {NbSe}_{2}$