T.‐C. Chiang

Topological Surface Superconductivity via Josephson Coupling in Bi 2 Te 3 /Nb

Joseph Andrew Hlevyack, Syu‐You Guan, Yen-Chen Tsui, Wenyu Chen et autres

High Resolution Image Download MS PowerPoint Slide Since discoveries of protected conducting surface states, topological superconducting qubits have enchanted quantum science as prime elements in future fault-tolerant devices, particularly those based on Josephson junctions containing topological insulators. Still, Josephson coupling is often …

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Signatures of Kramers-Weyl fermions in the charge density wave material (TaSe4)2I

Soyeun Kim, Robert C. McKay, Nina Bielinski, Junehu Park et autres

The quasi-one-dimensional charge density wave (CDW) material (TaSe4)2I has been recently predicted to host Kramers-Weyl (KW) fermions which should exist in the vicinity of high symmetry points in the Brillouin zone in chiral materials with strong spin-orbit coupling. However, direct spectroscopic evidence …

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In-Plane Anisotropy of Charge Density Wave Fluctuations in 1 T − TiSe 2

Xuefei Guo, Anshul Kogar, Jans Henke, Felix Flicker et autres

We report measurements of anisotropic triple-q charge density wave (CDW) fluctuations in the transition metal dichalcogenide 1T-TiSe_{2} over a large volume of reciprocal space with x-ray diffuse scattering. Above the transition temperature, T_{CDW}, the in-plane diffuse scattering is marked by ellipses which …

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Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe 3

Dipanjan Chaudhuri, Qianni Jiang, Xuefei Guo, Jin Chen et autres

A charge density wave (CDW) is a phase of matter characterized by a periodic modulation of valence electron density coupled with lattice distortion. Its formation is closely tied to the dynamical charge susceptibility, [Formula: see text], which reflects the collective electron dynamics …

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In-plane anisotropy of charge density wave fluctuations in 1$T$-TiSe$_2$

Xuefei Guo, Anshul Kogar, Jans Henke, Felix Flicker et autres

We report measurements of anisotropic triple-$q$ charge density wave (CDW) fluctuations in the transition metal dichalcogenide 1$T$-TiSe$_2$ over a large volume of reciprocal space with X-ray diffuse scattering. Above the transition temperature, $T_{\text{CDW}}$, the out-of-plane diffuse scattering is characterized by rod-like structures …

Evidence of Directional Structural Superlubricity and Lévy Flights in a van der Waals Heterostructure

Maxime Le Ster, Paweł Krukowski, Maciej Rogala, P. Dąbrowski et autres

Structural superlubricity is a special frictionless contact in which two crystals are in incommensurate arrangement such that relative in-plane translation is associated with vanishing energy barrier crossing. So far, it has been realized in multilayer graphene and other van der Waals (2D …

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Measurement of the dynamic charge susceptibility near the charge density wave transition in ErTe$_3$

Dipanjan Chaudhuri, Qianni Jiang, Xuefei Guo, Jin Chen et autres

A charge density wave (CDW) is a phase of matter characterized by a periodic modulation of the valence electron density accompanied by a distortion of the lattice structure. The microscopic details of CDW formation are closely tied to the dynamic charge susceptibility, …

Conformally invariant charge fluctuations in a strange metal

Xuefei Guo, Jin Chen, Farzaneh Hoveyda-Marashi, Simon Bettler et autres

The strange metal is a peculiar phase of matter in which the electron scattering rate, $τ^{-1} \sim k_B T/\hbar$, which determines the electrical resistance, is universal across a wide family of materials and determined only by fundamental constants. In 1989, theorists hypothesized …

Uniform Diffusion of Cooper Pairing Mediated by Hole Carriers in Topological Sb 2 Te 3 /Nb

Joseph Andrew Hlevyack, Sahand Najafzadeh, Yao Li, Tsubaki Nagashima et autres

Spin-helical Dirac Fermions at a doped topological insulator’s boundaries can support Majorana quasiparticles when coupled with s -wave superconductors, but in n -doped systems, the requisite induced Cooper pairing in topological states is often buried at heterointerfaces or complicated by degenerate coupling …

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Realization of a two-dimensional Weyl semimetal and topological Fermi strings

Qiangsheng Lu, P. Venugopal Reddy, Hoyeon Jeon, Alessandro R. Mazza et autres

A two-dimensional (2D) Weyl semimetal, akin to a spinful variant of graphene, represents a topological matter characterized by Weyl fermion-like quasiparticles in low dimensions. The spinful linear band structure in two dimensions gives rise to distinctive topological properties, accompanied by the emergence …

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Unconventional Spectral Gaps Induced by Charge Density Waves in the Weyl Semimetal (TaSe4)2I

Meng-Kai Lin, Joseph Andrew Hlevyack, Chengxi Zhao, Pavel Dudin et autres

High Resolution Image Download MS PowerPoint Slide Coupling Weyl quasiparticles and charge density waves (CDWs) can lead to fascinating band renormalization and many-body effects beyond band folding and Peierls gaps. For the quasi-one-dimensional chiral compound (TaSe 4 ) 2 I with an …

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Evidence of directional structural superlubricity and Lévy flights in a van der Waals heterostructure

Maxime Le Ster, Paweł Krukowski, Maciej Rogala, P. Dąbrowski et autres

Structural superlubricity is a special frictionless contact in which two crystals are in incommensurate arrangement such that relative in-plane translation is associated with vanishing energy barrier crossing. So far, it has been realized in multilayer graphene and other van der Waals two-dimensional …