Critical topology and pressure-induced superconductivity in the van der Waals compound AuTe2Br

  title={Critical topology and pressure-induced superconductivity in the van der Waals compound AuTe2Br},
  author={Erjian Cheng and Xianbiao Shi and Limin Yan and Tianheng Huang and Fengliang Liu and Wenlong Ma and Zeji Wang and Shuang Jia and Jian Sun and Weiwei Zhao and Wenge Yang and Yang Xu and Shiyan Li},
  journal={npj Quantum Materials},
The study on quantum spin Hall effect and topological insulators formed the prologue to the surge of research activities in topological materials in the past decade. Compared to intricately engineered quantum wells, three-dimensional weak topological insulators provide a natural route to the quantum spin Hall effect, due to the adiabatic connection between them and a stack of quantum spin Hall insulators, and the convenience in exfoliation of samples associated with their van der Waals-type… 



Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs3

Topological nodal-line semimetals (TNLSMs) are materials whose conduction and valence bands cross each other, meeting a topologically protected closed loop rather than discrete points in the

Observation and control of the weak topological insulator state in ZrTe5

It is demonstrated that the bulk band gap is controlled by external strain, realizing a more stable WTI state or an ideal Dirac semimetal (DS) state and the highly directional spin-current and the tunable band gap in ZrTe5 will provide an excellent platform for applications.

Pressure‐Driven Magneto‐Topological Phase Transition in a Magnetic Weyl Semimetal

The co‐occurrence of phase transitions with local and global order parameters, such as entangled magnetization and topological invariants, is attractive but seldom realized experimentally. In this

A weak topological insulator state in quasi-one-dimensional bismuth iodide

Angle-resolved photoemission spectroscopy is used to characterize the surface states of bismuth iodide, providing experimental evidence of a weak topological insulator state that had previously been only theoretically predicted.

Quantum spin Hall effect in two-dimensional transition metal dichalcogenides

Quantum spin Hall (QSH) effect materials feature edge states that are topologically protected from backscattering. However, the small band gap in materials that have been identified as QSH insulators

Transport of Topological Semimetals

Three-dimensional (3D) topological semimetals represent a new class of topological matters. The study of this family of materials has been at the frontiers of condensed matter physics, and many

Observation of the quantum spin Hall effect up to 100 kelvin in a monolayer crystal

The QSHE is established in monolayer tungsten ditelluride (WTe2) at temperatures much higher than in semiconductor heterostructures and allow for exploring topological phases in atomically thin crystals.

Topological insulators and superconductors

Topological insulators are new states of quantum matter which cannot be adiabatically connected to conventional insulators and semiconductors. They are characterized by a full insulating gap in the

Temperature-Driven Topological Phase Transition and Intermediate Dirac Semimetal Phase in ZrTe_{5}.

It is found that the energy gap closes around T_{p}, where the optical response exhibits characteristic signatures of a Dirac semimetal state, i.e., a linear frequency-dependent optical conductivity extrapolating to the origin (after subtracting a weak Drude response).

Subnanometre-wide electron channels protected by topology

Topologically protected states with a natural helicity are shown to form at step edges, which can be created with subnanometre precision in a weak topological insulator using atomic force microscopy.