Loss-induced Floquet non-Hermitian skin effect

• URL: http://arxiv.org/abs/2306.04460v1
• Date: Wed, 7 Jun 2023 14:36:34 GMT
• Title: Loss-induced Floquet non-Hermitian skin effect
• Authors: Yaohua Li, Cuicui Lu, Shuang Zhang, Yong-Chun Liu
• Abstract summary: We propose a mechanism of loss-induced Floquet NHSE, where the loss provides the basic source of non-Hermicity. We extend the generalized Brillouin zone theory to nonequilibrium systems to describe the Floquet NHSE. Our proposal can be realized in photonic lattices with helical waveguides and other related systems.
• Score: 0.5085064777896466
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-Hermitian topological systems have attracted lots of interest due to their unique topological properties when the non-Hermitian skin effect (NHSE) appears. However, the experimental realization of NHSE conventionally requires non-reciprocal couplings, which are compatible with limited systems. Here we propose a mechanism of loss-induced Floquet NHSE, where the loss provides the basic source of non-Hermicity and the Floquet engineering brings about the Floquet-induced complex next-nearest-neighbor couplings. We also extend the generalized Brillouin zone theory to nonequilibrium systems to describe the Floquet NHSE. Furthermore, we show that this mechanism can realize the second-order NHSE when generalized to two-dimensional systems. Our proposal can be realized in photonic lattices with helical waveguides and other related systems, which opens the door for the study of topological phases in Floquet non-Hermitian systems.

Related papers

• Topological Order in the Spectral Riemann Surfaces of Non-Hermitian Systems [44.99833362998488]
  We show topologically ordered states in the complex-valued spectra of non-Hermitian systems. These arise when the distinctive exceptional points in the energy surfaces of such models are annihilated. We illustrate the characteristics of the topologically protected states in a non-Hermitian two-band model.
  arXiv  Detail & Related papers  (2024-10-24T10:16:47Z)
• Floquet-Enriched Nontrivial Topology at Quantum Criticality [0.0]
  We identify a new class of Floquet criticality characterized by nontrivial topology. For generic driven Majorana fermion chains with chiral symmetry, we analytically demonstrate that Floquet driving can enrich the transition point. We provide an intuitive physical explanation for the underlying mechanism of the nontrivial topology at Floquet criticality.
  arXiv  Detail & Related papers  (2024-10-20T14:06:02Z)
• Study of quantum phase transition and entanglement in coupled top systems with standard and nonstandard symmetries under Floquet formalism [15.699822139827916]
  We study an effective time-independent Hamiltonian of a coupled kicked-top (CKT) system derived using the Van Vleck-based perturbation theory at the high-frequency driving limit under Floquet formalism. We study classical and quantum versions of this coupled top system for torsion-free and nonzero torsion cases.
  arXiv  Detail & Related papers  (2024-09-13T06:36:41Z)
• Non-chiral non-Bloch invariants and topological phase diagram in non-unitary quantum dynamics without chiral symmetry [26.179241616332387]
  We identify the non-Bloch topological phase diagram of a one-dimensional (1D) non-Hermitian system without chiral symmetry. We find that such topological invariants can distinguish topologically distinct gapped phases. Our work provides a useful platform to study the interplay among topology, symmetries and the non-Hermiticity.
  arXiv  Detail & Related papers  (2024-07-26T03:29:30Z)
• Observation of topology transition in Floquet non-Hermitian skin effects in silicon photonics [19.744996310272178]
  We realize the Floquet NHSE in periodically modulated optical waveguides integrated on a silicon photonics platform. Remarkably, we discover the transitions between the normal unipolar NHSEs and an unconventional bipolar NHSE. Our work unfolds a new route toward Floquet NHSEs originating from the interplay between gauge fields and dissipation effects.
  arXiv  Detail & Related papers  (2024-02-15T04:29:29Z)
• Dissipative preparation of a Floquet topological insulator in an optical lattice via bath engineering [44.99833362998488]
  Floquet engineering is an important tool for realizing charge-neutral atoms in optical lattices. We show that a driven-dissipative system approximates a topological insulator.
  arXiv  Detail & Related papers  (2023-07-07T17:47:50Z)
• Emergence of fluctuating hydrodynamics in chaotic quantum systems [47.187609203210705]
  macroscopic fluctuation theory (MFT) was recently developed to model the hydrodynamics of fluctuations. We perform large-scale quantum simulations that monitor the full counting statistics of particle-number fluctuations in boson ladders. Our results suggest that large-scale fluctuations of isolated quantum systems display emergent hydrodynamic behavior.
  arXiv  Detail & Related papers  (2023-06-20T11:26:30Z)
• Exceptional Classifications of Non-Hermitian Systems [2.218316486552747]
  Eigenstate coalescence in non-Hermitian systems is widely observed in diverse scientific domains. We propose an exhaustive classification framework for exceptional points (EPs) in non-Hermitian physical systems.
  arXiv  Detail & Related papers  (2023-06-12T08:53:33Z)
• Symmetry and topological classification of Floquet non-Hermitian systems [2.5897520593396495]
  Floquet and non-Hermitian topological phases can be epitomized by the various Floquet and non-Hermitian phases. We systematically classify FNH topological bands for 54-fold generalized Bernard-LeClair (GBL)symmetry classes and arbitrary spatial dimensions. Our results naturally produce the periodic tables of Floquet Hermitian topological insulators and Floquet unitaries.
  arXiv  Detail & Related papers  (2021-12-13T14:55:39Z)
• Bridging the gap between topological non-Hermitian physics and open quantum systems [62.997667081978825]
  We show how to detect a transition between different topological phases by measuring the response to local perturbations. Our formalism is exemplified in a 1D Hatano-Nelson model, highlighting the difference between the bosonic and fermionic cases.
  arXiv  Detail & Related papers  (2021-09-22T18:00:17Z)
• Dynamical solitons and boson fractionalization in cold-atom topological insulators [110.83289076967895]
  We study the $mathbbZ$ Bose-Hubbard model at incommensurate densities. We show how defects in the $mathbbZ$ field can appear in the ground state, connecting different sectors. Using a pumping argument, we show that it survives also for finite interactions.
  arXiv  Detail & Related papers  (2020-03-24T17:31:34Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.