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Topological insulators and superconductors: ten-fold way and dimensional hierarchy
Shinsei Ryu, Andreas Schnyder, Akira Furusaki +1
It has recently been shown that in every spatial dimension there exist precisely five distinct classes of topological insulators or superconductors. Within a given class, the diffe…
Electronic and phononic Raman scattering in detwinned YBaCuO and YCaBaCuO: s-wave admixture to the -wave order parameter
M. Bakr, A. P. Schnyder, L. Klam +5
Inelastic light (Raman) scattering has been used to study electronic excitations and phonon anomalies in detwinned, slightly overdoped YBaCuO and moderately overdo…
Excitation spectrum and magnetic field effects in a quantum critical spin-orbital system:FeScS
Gang Chen, Andreas P. Schnyder, Leon Balents
The orbitally degenerate A-site spinel compound FeSc2S4 has been experimentally identified as a ``spin-orbital liquid'', with strong fluctuations of both spins and orbitals. Assumi…
Classification of Topological Insulators and Superconductors
Andreas P. Schnyder, Shinsei Ryu, Akira Furusaki +1
An exhaustive classification scheme of topological insulators and superconductors is presented. The key property of topological insulators (superconductors) is the appearance of ga…
The superspin approach to a disordered quantum wire in the chiral-unitary symmetry class with an arbitrary number of channels
Andreas P. Schnyder, Christopher Mudry, Ilya A. Gruzberg
We use a superspin Hamiltonian defined on an infinite-dimensional Fock space with positive definite scalar product to study localization and delocalization of noninteracting spinle…
Lattice model of three-dimensional topological singlet superconductor with time-reversal symmetry
Andreas P. Schnyder, Shinsei Ryu, Andreas W. W. Ludwig
We study topological phases of time-reversal invariant singlet superconductors in three spatial dimensions. In these particle-hole symmetric systems the topological phases are char…