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Anomalous Andreev Reflection on a Torus-Shaped Fermi Surface
Wei Luo, Wei Chen, D. Y. Xing
Andreev reflection (AR) refers to the electron-hole conversion at the normal metal-superconductor interface. In a three-dimensional metal with spherical Fermi surface, retro (specu…
Andreev Reflection in Fermi Arc Surface States of Weyl Semimetals
Yue Zheng, Wei Chen, D. Y. Xing
Fermi arc surface states are the hallmark of Weyl semimetals, whose identification is usually challenged by their coexistence with gapless bulk states. Surface transport measuremen…
Random-gate-voltage induced Al'tshuler-Aronov-Spivak effect in topological edge states
Kun Luo, Wei Chen, Li Sheng +1
Helical edge states are the hallmark of the quantum spin Hall insulator. Recently, several experiments have observed transport signatures contributed by trivial edge states, making…
Spin torque and persistent currents caused by percolation of topological surface states
Wei Chen
The topological insulator/ferromagnetic metal (TI/FMM) bilayer thin films emerged as promising topological surface state-based spintronic devices, most notably in their efficiency…
Absence of equilibrium edge currents in theoretical models of topological insulators
Wei Chen
The low energy sector of 2D and 3D topological insulators (TIs) exhibits propagating edge states, which has speculated the existence of equilibrium edge currents or edge spin curre…
Persistent currents and spin torque caused by percolated quantum spin Hall state
Antonio Zegarra, J. Carlos Egues, Wei Chen
Motivated by recent experiments, we investigate the quantum spin Hall state in 2D topological insulator/ferromagnetic metal planar junctions by means of a tight-binding model and l…