Robust Anderson transition in non-Hermitian photonic quasicrystals

• URL: http://arxiv.org/abs/2404.04537v1
• Date: Sat, 6 Apr 2024 07:35:04 GMT
• Title: Robust Anderson transition in non-Hermitian photonic quasicrystals
• Abstract summary: Anderson localization, i.e. the suppression of diffusion in lattices with random or incommensurate disorder, is a fragile interference phenomenon. Here we consider localization-delocalization phase transitions occurring in non-Hermitian quasicrystals with local incommensurate gain and loss.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Anderson localization, i.e. the suppression of diffusion in lattices with random or incommensurate disorder, is a fragile interference phenomenon which is spoiled out in the presence of dephasing effects or fluctuating disorder. As a consequence, Anderson localization-delocalization phase transitions observed in Hermitian systems, such as in one-dimensional quasicrystals when the amplitude of the incommensurate potential is increased above a threshold, are washed out when dephasing effects are included. Here we consider localization-delocalization spectral phase transitions occurring in non-Hermitian quasicrystals with local incommensurate gain and loss, and show that, contrary to the Hermitian case, the non-Hermitian phase transition is robust against dephasing effects. The results are illustrated by considering synthetic quasicrystals in photonic mesh lattices.

Related papers

• Topology from Decoherence [39.407739937584104]
  We show that decoherence can induce topological phenomena.<n>We demonstrate this in a lattice system subject to environment-induced dephasing.<n>Our results establish correlated quantum noise as a route to topology in open many-body systems.
  arXiv  Detail & Related papers  (2026-07-08T18:00:04Z)
• Observation of disorder-induced superfluidity [121.09589727417034]
  We explore phases arising from the interplay between disorder, kinetic energy, and interactions on a superconducting processor.<n>Our results provide strong experimental evidence for disorder-induced superfluidity.
  arXiv  Detail & Related papers  (2025-12-24T20:38:43Z)
• Topological crystals and soliton lattices in a Gross-Neveu model with Hilbert-space fragmentation [41.94295877935867]
  We explore the finite-density phase diagram of the single-flavour Gross-Neveu-Wilson (GNW) model.<n>We find a sequence of inhomogeneous ground states that arise through a real-space version of the mechanism of Hilbert-space fragmentation.
  arXiv  Detail & Related papers  (2025-06-23T14:19:35Z)
• Topological Phase Transitions and Mixed State Order in a Hubbard Quantum Simulator [36.556659404501914]
  Topological phase transitions challenge conventional paradigms in many-body physics.<n>We observe such a transition between one-dimensional crystalline symmetry-protected topological phases.<n>Our results demonstrate how topology and information influence quantum phase transitions.
  arXiv  Detail & Related papers  (2025-05-22T17:58:35Z)
• Measurement-induced entanglement transition in chaotic quantum Ising chain [42.87502453001109]
  We study perturbations that break the integrability and/or the symmetry of the model, as well as modifications in the measurement protocol, characterizing the resulting chaos and lack of integrability through the Dissipative Spectral Form Factor (DSFF) We show that while the measurement-induced phase transition and its properties appear broadly insensitive to lack of integrability and breaking of the $bbZ$ symmetry, a modification of the measurement basis from the transverse to the longitudinal direction makes the phase transition disappear altogether.
  arXiv  Detail & Related papers  (2024-07-11T17:39:29Z)
• Dephasing-induced mobility edges in quasicrystals [0.0]
  Mobility edges (ME) arise in the single-particle energy spectrum of certain one-dimensional lattices with aperiodic order. Dephasing and decoherence effects are widely acknowledged to spoil Anderson localization and to enhance transport. Here it is shown that ME can be created by pure dephasing effects in quasicrystals.
  arXiv  Detail & Related papers  (2024-05-12T07:53:28Z)
• Correlation-induced phase transitions and mobility edges in an interacting non-Hermitian quasicrystal [0.0]
  We uncover the effect of quantum correlation on phase transitions and entanglement dynamics in non-Hermitian quasicrystals. Our findings pave the way for further studies of the interplay between disorder and interaction in non-Hermitian quantum matter.
  arXiv  Detail & Related papers  (2023-10-02T15:25:03Z)
• Non-Hermiticity induced Exceptional Points and Skin Effect in the Dice-Haldane Model [12.632098351321218]
  We investigate the role of non-Hermiticity in the Chern insulating Haldane model on a dice lattice. We introduce non-Hermiticity into this model in two ways -- through balanced non-Hermitian gain and loss, and by non-reciprocal hopping in one direction. Our results place the dice-Haldane model as an exciting platform to explore non-Hermitian physics.
  arXiv  Detail & Related papers  (2022-07-29T11:13:09Z)
• Locality of Spontaneous Symmetry Breaking and Universal Spacing Distribution of Topological Defects Formed Across a Phase Transition [62.997667081978825]
  A continuous phase transition results in the formation of topological defects with a density predicted by the Kibble-Zurek mechanism (KZM) We characterize the spatial distribution of point-like topological defects in the resulting nonequilibrium state and model it using a Poisson point process in arbitrary spatial dimension with KZM density.
  arXiv  Detail & Related papers  (2022-02-23T19:00:06Z)
• Simulating non-Hermitian quasicrystals with single-photon quantum walks [8.119496606443793]
  We experimentally simulate non-Hermitian quasicrystals using photonic quantum walks. Our work opens the avenue of investigating the interplay of non-Hermiticity, quasiperiodicity, and spectral topology in open quantum systems.
  arXiv  Detail & Related papers  (2021-12-30T12:19:42Z)
• Topological transitions with continuously monitored free fermions [68.8204255655161]
  We show the presence of a topological phase transition that is of a different universality class than that observed in stroboscopic projective circuits. We find that this entanglement transition is well identified by a combination of the bipartite entanglement entropy and the topological entanglement entropy.
  arXiv  Detail & Related papers  (2021-12-17T22:01:54Z)
• Experimentally Detecting Quantized Zak Phases without Chiral Symmetry in Photonic Lattices [14.450949607717437]
  We experimentally realize an extended Su-Schrieffer-Heeger model with broken chiral symmetry. Our results demonstrate that inversion symmetry protects the quantized Zak phase, but edge states can disappear in the topological nontrivial phase. Our photonic lattice provides a useful platform to study the interplay among topological phases, symmetries, and the bulk-boundary correspondence.
  arXiv  Detail & Related papers  (2021-09-28T13:35:44Z)
• Damping transition in an open generalized Aubry-Andr\'e-Harper model [0.9239657838690226]
  We study the damping dynamics of the single-particle correlation for an open system under periodic and aperiodic order. Due to the non-Hermitian skin effect, the damping dynamics is boundary sensitive. We propose a possible scheme with ultracold atoms in a dissipative momentum lattice to realize and detect the damping dynamics.
  arXiv  Detail & Related papers  (2021-09-27T11:21:31Z)
• Non-Hermitian quasicrystal in dimerized lattices [0.0]
  Non-Hermitian quasicrystals possess PT and metal-insulator transitions induced by gain and loss or nonreciprocal effects. By investigating the spectrum, adjacent gap ratios and inverse participation ratios, we find an extended phase, a localized phase and a mobility edge phase.
  arXiv  Detail & Related papers  (2021-05-07T14:52:47Z)
• Observing localisation in a 2D quasicrystalline optical lattice [52.77024349608834]
  We experimentally and numerically study the ground state of non- and weakly-interacting bosons in an eightfold symmetric optical lattice. We find extended states for weak lattices but observe a localisation transition at a lattice depth of $V_0.78(2),E_mathrmrec$ for the non-interacting system.
  arXiv  Detail & Related papers  (2020-01-29T15:54:42Z)

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.