Magnetic Control of the Non-Hermitian Skin Effect in Two-Dimensional Lattices

• URL: http://arxiv.org/abs/2511.20518v1
• Date: Tue, 25 Nov 2025 17:21:23 GMT
• Title: Magnetic Control of the Non-Hermitian Skin Effect in Two-Dimensional Lattices
• Authors: Stefano Longhi,
• Abstract summary: The non-Hermitian skin effect (NHSE) -- the anomalous boundary accumulation of an extensive number of bulk modes -- has emerged as a hallmark of non-Hermitian physics.<n>We develop a theoretical framework for magnetic control of the NHSE along line boundaries in two-dimensional single-band lattices.<n>We show that magnetic fields suppress the geometric skin effect in reciprocal models, whereas skin localization can persist in nonreciprocal systems.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The non-Hermitian skin effect (NHSE) -- the anomalous boundary accumulation of an extensive number of bulk modes -- has emerged as a hallmark of non-Hermitian physics, with broad implications for transport, sensing, and topological classification. A central open question is how magnetic or synthetic gauge fields influence this boundary phenomenon. Here, we develop a theoretical framework for magnetic control of the NHSE along line boundaries in two-dimensional single-band lattices. Using a non-Hermitian extension of the anisotropic Harper--Hofstadter model as a representative example, we show that magnetic fields suppress the geometric skin effect in reciprocal models, whereas skin localization can persist in nonreciprocal systems. The analysis disentangles the interplay of flux, nonreciprocity, and boundary geometry, revealing that magnetic fields mitigate or suppress the NHSE through distinct physical mechanisms -- such as bulk localization via Landau or Anderson physics, or the restoration of effective reciprocity. In particular, the geometry-dependent skin effect in reciprocal systems is found to be fragile against even weak magnetic fields.

Related papers

• Observation of Magnetic Devil's Staircase-Like Behavior in Quasiperiodic Qubit Lattices [55.2480439325792]
  devil's staircase (DS) phenomenon is a fractal response of magnetization to external fields.<n>We uncover a wealth of abrupt magnetic transitions driven by increasing external magnetic fields within a simple yet effective Ising-model framework.<n>Our results challenge the prevailing view that DS behavior is limited to periodic systems.
  arXiv  Detail & Related papers  (2025-07-24T21:39:06Z)
• Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator [50.54133633499971]
  We study the intrinsic magnetic topological material MnBi2Te4 in which the heavy n-type doping features are strongly suppressed.<n>Based on angle-resolved photoemission spectroscopy, transport measurements, and first-principles calculations, we reveal two magnetism-induced TPTs.<n>Our work paves the way for the realization of intrinsic magnetic topological states in MnBi2Te4 family and provides an ideal platform for achieving controllable and continuous TPTs.
  arXiv  Detail & Related papers  (2025-03-08T03:46:54Z)
• Harnessing Chiral Spin States in Molecular Nanomagnets for Quantum Technologies [44.1973928137492]
  We show that chiral qubits naturally suppress always-on interactions that can not be switched off in weakly coupled qubits.<n>Our findings establish spin chirality engineering as a promising strategy for mitigating always-on interaction in entangling two chiral qubits in molecular quantum technologies.
  arXiv  Detail & Related papers  (2025-01-21T08:23:12Z)
• Non-Hermitian Effects in Dicke models [18.25522741939446]
  We study the manifestation of non-Hermitian effects in the Dicke model of light-matter interaction. Our findings deepen the understanding of non-Hermitian physics in light-matter interaction.
  arXiv  Detail & Related papers  (2024-11-13T06:30:10Z)
• Anomalous symmetry protected blockade of skin effect in one-dimensional non-Hermitian lattice systems [20.4728241808175]
  We present a theorem which shows that the combined spatial reflection symmetry can be considered as a criterion in one-dimensional non-Hermitian systems. Our results reveal a profound connection between the symmetry and the fate of NHSE.
  arXiv  Detail & Related papers  (2024-07-29T07:57:59Z)
• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops [23.17305544412557]
  We fabricate a device of 7-septuple-layer MnBi2Te4 covered with AlOx capping layer. We uncover a cascade of quantum phase transitions that can be attributed to the influence of spin configurations on charge transport. The versatile tunability of the quantum anomalous Hall effect in MnBi2Te4 paves the way for potential applications in topological antiferromagnetic spintronics.
  arXiv  Detail & Related papers  (2024-05-14T15:08:07Z)
• Non-Hermitian and Liouvillian skin effects in magnetic systems [5.680861111258068]
  The non-Hermitian skin effect (NHSE) has emerged as a hallmark of non-Hermitian physics, with far-reaching implications for transport, topology, and sensing.<n>Here, we explore both the non-Hermitian and Liouvillian dynamics of a spin chain coupled to a bosonic reservoir.<n>Our analysis also reveals that the NHSE stems from the interplay between chiral spin couplings and reciprocal nonlocal dissipation.
  arXiv  Detail & Related papers  (2023-07-28T20:19:42Z)
• Manipulating non-Hermitian skin effect via electric fields [2.547311585168061]
  In non-Hermitian systems, the phenomenon that the bulk-band eigenstates are accumulated at the boundaries of the systems is called non-Hermitian skin effect (NHSE) We show abundant manipulation effects of dc and ac fields on NHSE, and that the physical mechanism behind these effects is the interplay between the Stark localization, dynamic localization and NHSE.
  arXiv  Detail & Related papers  (2022-01-25T13:43:45Z)
• Magnetic suppression of non-Hermitian skin effects [10.933587894257421]
  Skin effect, where macroscopically many bulk states are aggregated towards the system boundary, is one of the most important and distinguishing phenomena in non-Hermitian quantum systems. We discuss a new aspect of this effect whereby, despite its topological origin, applying magnetic field can largely suppress it.
  arXiv  Detail & Related papers  (2021-10-28T01:44:15Z)
• Non-Hermitian dislocation modes: Stability and melting across exceptional points [0.0]
  dislocation lattice defects support robust topological modes in the bulk of a non-Hermitian (NH) system. We explicitly demonstrate these findings for a two-dimensional NH Chern insulator, thereby establishing that dislocation lattice defects can be instrumental to experimentally probe pristine NH topology.
  arXiv  Detail & Related papers  (2021-05-11T17:59:33Z)
• Designer Magnetism in High Entropy Oxides [41.74498230885008]
  Disorder can have a dominating influence on correlated and quantum materials. In magnetic systems, spin and exchange disorder can provide access to quantum criticality, frustration, and spin dynamics. We show that high entropy oxides present an unexplored route to designing quantum materials.
  arXiv  Detail & Related papers  (2021-04-12T15:21:48Z)
• Effects of Topological Defect on the Energy Spectra and Thermo-magnetic Properties of CO Diatomic Molecule [0.0]
  Confinement effects of Aharonov-Bohm flux and magnetic fields with topological defect on CO diatomic molecule modeled by screened modified Kratzer potential is investigated. We observe that the system tends to exhibit both a paramagnetic and diamagnetic behavior for weak and intense magnetic field respectively and some sort of saturation at large magnetic field.
  arXiv  Detail & Related papers  (2021-02-19T10:21:16Z)

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.