Zobrazeno 1 - 10
of 68
pro vyhledávání: '"ALVERMANN, ANDREAS"'
We perform a numerical study of Floquet topological insulators with temporal disorder to investigate the existence of quantized charge transport without Anderson localization. We first argue that in setups with temporal imperfections Anderson localiz
Externí odkaz:
http://arxiv.org/abs/2301.09520
Publikováno v:
ACM Trans. Parallel Comput. 10, 16 (2023)
We address the communication overhead of distributed sparse matrix-(multiple)-vector multiplication in the context of large-scale eigensolvers, using filter diagonalization as an example. The basis of our study is a performance model which includes a
Externí odkaz:
http://arxiv.org/abs/2209.01974
Publikováno v:
Phys. Rev. A 104, L051501 (2021)
We show how quantized transport can be realized in Floquet chains through encapsulation of a chiral or helical shift. The resulting transport is immutable rather than topological in the sense that it neither requires a band gap nor is affected by arb
Externí odkaz:
http://arxiv.org/abs/2108.03960
Publikováno v:
APL Photonics 6, 010801 (2021)
We propose a one-dimensional Floquet ladder that possesses two distinct topological transport channels with opposite directionality. The transport channels occur due to a $\mathbb Z_2$ non-Hermitian Floquet topological phase that is protected by time
Externí odkaz:
http://arxiv.org/abs/2011.07829
Publikováno v:
Eur. Phys. J. B, (2020) 93:151
We present a non-Hermitian Floquet model with topological edge states in real and imaginary band gaps. The model utilizes two stacked honeycomb lattices which can be related via four different types of non-Hermitian time-reversal symmetry. Implementi
Externí odkaz:
http://arxiv.org/abs/2008.09812
Publikováno v:
EPL, 131 (2020) 30007
In two-dimensional anomalous Floquet insulators, non-Hermitian boundary state engineering can be used to completely separate chiral boundary states from bulk bands in the quasienergy spectrum. The topological properties of such spectrally separated b
Externí odkaz:
http://arxiv.org/abs/2004.03290
Publikováno v:
Phys. Rev. Research 2, 023235 (2020)
We show that non-Hermiticity enables topological phases with unidirectional transport in one-dimensional Floquet chains. The topological signatures of these phases are non-contractible loops in the spectrum of the Floquet propagator that are separate
Externí odkaz:
http://arxiv.org/abs/1911.11413
Publikováno v:
Phys. Rev. Lett. 123, 190403 (2019)
In Hermitian topological systems, the bulk-boundary correspondence strictly constraints boundary transport to values determined by the topological properties of the bulk. We demonstrate that this constraint can be lifted in non-Hermitian Floquet insu
Externí odkaz:
http://arxiv.org/abs/1908.01372
Publikováno v:
Phys. Rev. B 99, 245102 (2019)
Universal driving protocol for symmetry-protected Floquet topological phasesWe propose a universal driving protocol for the realization of symmetry-protected topological phases in $2+1$ dimensional Floquet systems. Our proposal is based on the theore
Externí odkaz:
http://arxiv.org/abs/1906.04149
Autor:
Maczewsky, Lukas J., Höckendorf, Bastian, Kremer, Mark, Biesenthal, Tobias, Heinrich, Matthias, Alvermann, Andreas, Fehske, Holger, Szameit, Alexander
Publikováno v:
Nature Materials (2020)
Much of the recent enthusiasm directed towards topological insulators as a new state of matter is motivated by their hallmark feature of protected chiral edge states. In fermionic systems, Kramers degeneracy gives rise to these entities in the presen
Externí odkaz:
http://arxiv.org/abs/1812.07930