107 citations · 187 across the 7 of their papers we have counts for
7 papers
Exponentially growing bulk Green functions as signature of nontrivial non-Hermitian winding number in one dimension
Heinrich-Gregor Zirnstein, Bernd Rosenow
A nonzero non-Hermitian winding number indicates that a gapped system is in a nontrivial topological class due to the non-Hermiticity of its Hamiltonian. While for Hermitian system…
Topological Magnetoelectric Effect: Nonlinear Time-Reversal-Symmetric Response, Witten Effect, and Half-Integer Quantum Hall Effect
Heinrich-Gregor Zirnstein, Bernd Rosenow
Topological insulators (TIs) in three space dimensions can be characterized by a quantized magnetoelectric coefficient. However, this coupling does not have experimentally observab…
Bulk-boundary correspondence for non-Hermitian Hamiltonians via Green functions
Heinrich-Gregor Zirnstein, Gil Refael, Bernd Rosenow
Genuinely non-Hermitian topological phases can be realized in open systems with sufficiently strong gain and loss; in such phases, the Hamiltonian cannot be deformed into a gapped…
Evolution of the transmission phase through a Coulomb-blockaded Majorana wire
Casper Drukier, Heinrich-Gregor Zirnstein, Bernd Rosenow +2
We present a study of the transmission of electrons through a semiconductor quantum wire with strong spin-orbit coupling in proximity to an s-wave superconductor, which is Coulomb-…
Time-reversal-symmetric topological magnetoelectric effect in three-dimensional topological insulators
Heinrich-Gregor Zirnstein, Bernd Rosenow
One of the hallmarks of time-reversal-symmetric topological insulators in three dimensions is the topological magnetoelectric effect (TME). So far, a time-reversal breaking variant…
Cancellation of quantum anomalies and bosonization of three-dimensional time-reversal symmetric topological insulators
Heinrich-Gregor Zirnstein, Bernd Rosenow
The strong time-reversal symmetric (TRS) topological insulator (TI) in three space dimensions features gapless surface states in the form of massless Dirac fermions. We study these…
Formulating Szemerédi's Theorem in Terms of Ultrafilters
Heinrich-Gregor Zirnstein
Van der Waerden's theorem asserts that if you color the natural numbers with, say, five different colors, then you can always find arbitrarily long sequences of numbers that have t…