Non-Hermitian Weyl Physics in Topological Insulator Ferromagnet Junctions

Abstract

We introduce and investigate material junctions as a generic and tuneable electronic platform for the realization of exotic non-Hermitian (NH) topological states of matter, where the NH character is induced by the surface self-energy of a thermal reservoir. As a conceptually rich and immediately experimentally realizable example, we consider a three-dimensional topological insulator (TI) coupled to a ferromagnetic lead. Remarkably, the symmetry protected TI is promoted in a dissipative fashion to a non-symmetry protected NH Weyl phase with no direct Hermitian counterpart and which exhibits robustness against any perturbation. The transition between a gapped phase and the NH Weyl phase may be readily tuned experimentally with the magnetization direction of the ferromagnetic lead. Given the robustness of this exotic nodal phase, our general analysis also applies to, e.g., a two-dimensional electron gas close to criticality in proximity to a ferromagnetic lead. There, the predicted bulk Fermi arcs are directly amenable to surface spectroscopy methods such as angle-resolved photoemission spectroscopy.

6 pages, 4 figures

References in corpus (12)

• Topological Photonics
• Making Sense of Non-Hermitian Hamiltonians
• The physics of exceptional points
• Edge Modes, Degeneracies, and Topological Numbers in Non-Hermitian Systems
• Selective enhancement of topologically induced interface states in a dielectric resonator chain
• Periodic Table for Topological Bands with Non-Hermitian Bernard-LeClair Symmetries
• New topological invariants in non-Hermitian systems
• Exceptional rings in two-dimensional correlated systems with chiral symmetry
• Non-Hermitian systems and topology: A transfer-matrix perspective
• Flat Band in Disorder Driven Non-Hermitian Weyl Semimetals
• Topological phase in a non-Hermitian PT symmetric system
• Disorder-induced exceptional points and nodal lines in Dirac superconductors

Cited by in corpus (80)

• Exceptional Topology of Non-Hermitian Systems
• Non-Hermitian Physics
• Symmetry and Topology in Non-Hermitian Physics
• Topological Origin of Non-Hermitian Skin Effects
• Non-Hermitian topological phenomena: A review
• Higher-order non-Hermitian skin effect
• Non-Bloch band theory of non-Hermitian Hamiltonians in the symplectic class
• Topological Classification of Non-Hermitian Hamiltonians
• Perspective on topological states of non-Hermitian lattices
• Many-body topology of non-Hermitian systems
• Topology of anti-parity-time-symmetric non-Hermitian Su-Schrieffer-Heeger model
• Topological Field Theory of Non-Hermitian Systems
• Quantum anomaly, non-Hermitian skin effects, and entanglement entropy in open systems
• Non-Hermitian topology of spontaneous magnon decay
• Non-Hermitian Floquet topological superconductors with multiple Majorana edge modes
• Bulk-boundary correspondence in non-Hermitian systems: stability analysis for generalized boundary conditions
• Magnetic suppression of non-Hermitian skin effects
• Exceptional Spin Liquids from Couplings to the Environment
• Non-Hermitian Topological Phases: Principles and Prospects
• Chiral-symmetry protected exceptional torus in correlated nodal-line semi-metals
• Exceptional band touching for strongly correlated systems in equilibrium
• Phase Transitions and Generalized Biorthogonal Polarization in Non-Hermitian Systems
• Finite temperature dynamical quantum phase transition in a non-Hermitian system
• Exceptional odd-frequency pairing in non-Hermitian superconducting systems
• Non-Hermitian higher-order topological superconductors in two-dimension: statics and dynamics
• Homotopy, Symmetry, and Non-Hermitian Band Topology
• Bulk-boundary correspondence in point-gap topological phases
• Inversion symmetric non-Hermitian Chern insulator
• Nonreciprocal Charge and Spin Transport Induced by Non-Hermitian Skin Effect in Mesoscopic Heterojunctions
• Non-Hermitian topology in monitored quantum circuits
• Anomaly in dynamical quantum phase transition in non-Hermitian system with extended gapless phases
• Non-Hermitian many-body topological excitations in interacting quantum dots
• Controlling Exceptional Points with Light
• Real spectra in non-Hermitian topological insulators
• Symmetry-protected exceptional and nodal points in non-Hermitian systems
• Topological enhancement of non-normality in non-Hermitian skin effects
• Generalized Berry phase for a bosonic Bogoliubov system with exceptional points
• Dissipative analog of four-dimensional quantum Hall physics
• Light-driven Lifshitz transitions in non-Hermitian multi-Weyl semimetals
• Non-Hermitian phase-biased Josephson junctions
• Non-Hermitian Topology in Hermitian Topological Matter
• Bulk Bogoliubov Fermi arcs in non-Hermitian superconducting systems
• Hexagonally warped exceptional physics in multi-Weyl semimetals
• Anomalous Andreev Spectrum and Transport in Non-Hermitian Josephson Junctions
• Non-normal Hamiltonian dynamics in quantum systems and its realization on quantum computers
• Exceptional degeneracies in non-Hermitian Rashba semiconductors
• Characterizing the Bulk-Boundary Correspondence of one-dimensional non-Hermitian interacting systems by edge entanglement entropy
• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
• Non-Hermitian chiral anomalies
• Non-Hermitian higher-Order Weyl semimetal with surface diabolic points
• Dynamical signatures of point-gap Weyl semimetal
• Alice string in Non-Hermitian Systems
• State-dependent Topological Invariants and Anomalous Bulk-Boundary Correspondence in non-Hermitian Topological Systems
• Exceptional Non-Hermitian Phases in Disordered Quantum Wires
• Non-Hermitian minimal Kitaev chains
• Mesoscopic transport signatures of disorder-induced non-Hermitian phases
• Fingerprint of Non-Hermiticity in d-wave Altermagnet
• Dynamically Induced Exceptional Phases in Quenched Interacting Semimetals
• $\mathcal{P}\mathcal{T}$ symmetry-protected exceptional cones and analogue Hawking radiation
• Correlations in non-Hermitian systems and Diagram techniques for the steady state
• Persistent anomaly in dynamical quantum phase transition in long-range non-Hermitian $p$-wave Kitaev chain
• Andreev non-Hermitian Hamiltonian for open Josephson junctions from Green's functions
• Surface exceptional points in a topological Kondo insulator
• Corner modes in non-Hermitian next-nearest-neighbor hopping model
• Nonlinear Hall effects with an exceptional ring
• Unconventional quantum criticality in a non-Hermitian extended Kitaev chain
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Spontaneous Formation of Exceptional Points at the Onset of Magnetism
• Emergence of exceptional points and their spectroscopic signature in Dirac semimetal-dirty Superconductor heterojunction
• Non-Hermitian Boundary in a Surface Selective Reconstructed Magnetic Weyl Semimetal
• Non-Hermitian topological quantum states in a reservoir-engineered transmon chain
• Random non-Hermitian action theory for stochastic quantum dynamics: from canonical to path integral quantization
• Supercurrent from the imaginary part of the Andreev levels in non-Hermitian Josephson junctions
• Non-Hermitian skin effect and electronic nonlocal transport
• Topological Engineering of High-Order Exceptional Points through Transformation Optics
• Adiabatic charge transport through non-Bloch bands
• Tailoring higher-order van Hove singularities in non-Hermitian interface systems via Floquet engineering
• Magnetic field effects on the Kitaev model coupled to environment
• Hexagonal Warping Control of Exceptional Points in Topological Insulator--Ferromagnetic Heterojunctions
• Physical constraints on effective non-Hermitian systems