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Braiding Majorana corner modes in a second-order topological superconductor
Tudor E. Pahomi, Manfred Sigrist, Alexey A. Soluyanov
We propose the concept of a device based on a square-shaped sample of a two-dimensional second-order topological helical superconductor which hosts two zero-dimensional Majorana qu…
Non-Abelian band topology in noninteracting metals
QuanSheng Wu, Alexey A. Soluyanov, Tomáš Bzdušek
Electron energy bands of crystalline solids generically exhibit degeneracies called band-structure nodes. Here, we introduce non-Abelian topological charges that characterize line…
Orbital contributions to the electron g-factor in semiconductor nanowires
Georg W. Winkler, Dániel Varjas, Rafal Skolasinski +3
Recent experiments on Majorana fermions in semiconductor nanowires [Albrecht et al., Nat. 531, 206 (2016)] revealed a surprisingly large electronic Landé g-factor, several times la…
Triple Point Topological Metals
Ziming Zhu, Georg W. Winkler, QuanSheng Wu +2
Topologically protected fermionic quasiparticles appear in metals, where band degeneracies occur at the Fermi level, dictated by the band structure topology. While in some metals t…
Experimental Signatures of the Inverted Phase in InAs/GaSb Coupled Quantum Wells
Matija Karalic, Susanne Mueller, Christopher Mittag +8
Transport measurements are performed on InAs/GaSb double quantum wells at zero and finite magnetic fields applied parallel and perpendicular to the quantum wells. We investigate a…
Nodal-chain metals
Tomáš Bzdušek, QuanSheng Wu, Andreas Rüegg +2
The band theory of solids is arguably the most successful theory of condensed matter physics, providing the description of the electronic energy levels in a variety of materials. E…
Topological Phases in InAsSb: From Novel Topological Semimetal to Majorana Wire
Georg W. Winkler, QuanSheng Wu, Matthias Troyer +2
Superconductor proximitized one-dimensional semiconductor nanowires with strong spin-orbit interaction (SOI) are at this time the most promising candidates for the realization of t…
Smooth gauge and Wannier functions for topological band structures in arbitrary dimensions
Georg W. Winkler, Alexey A. Soluyanov, Matthias Troyer
The construction of exponentially localized Wannier functions for a set of bands requires a choice of Bloch-like functions that span the space of the bands in question, and are smo…
Type-II Weyl Semimetals
Alexey A. Soluyanov, Dominik Gresch, Zhijun Wang +4
Fermions in nature come in several types: Dirac, Majorana and Weyl are theoretically thought to form a complete list. Even though Majorana and Weyl fermions have for decades remain…
Smooth gauge for topological insulators
Alexey A. Soluyanov, David Vanderbilt
We develop a technique for constructing Bloch-like functions for 2D Z_2-insulators (i.e., quantum spin-Hall insulators) that are smooth functions of k on the entire Brillouin-zone…
Wannier representation of Z_2 topological insulators
Alexey A. Soluyanov, David Vanderbilt
We consider the problem of constructing Wannier functions for Z_2 topological insulators in two dimensions. It is well known that there is a topological obstruction to the construc…