Perspective: non-Hermitian physics in magnetic systems
arXiv:2209.03946 · doi:10.1063/5.0124841
Abstract
Non-Hermitian Hamiltonians provide an alternative perspective on the dynamics of quantum and classical systems coupled non-conservatively to an environment. Once primarily an interest of mathematical physicists, the theory of non-Hermitian Hamiltonians has solidified and expanded to describe various physically observable phenomena in optical, photonic, and condensed matter systems. Self-consistent descriptions of quantum mechanics based on non-Hermitian Hamiltonians have been developed and continue to be refined. In particular, non-Hermitian frameworks to describe magnonic and hybrid magnonic systems have gained popularity and utility in recent years, with new insights into the magnon topology, transport properties, and phase transitions coming into view. Magnonic systems are in many ways a natural platform in which to realize non-Hermitian physics because they are always coupled to a surrounding environment and exhibit lossy dynamics. In this perspective we review recent progress in non-Hermitian frameworks to describe magnonic and hybrid magnonic systems, such as cavity magnonic systems and magnon-qubit coupling schemes. We discuss progress in understanding the dynamics of inherently lossy magnetic systems as well as systems with gain induced by externally applied spin currents. We enumerate phenomena observed in both purely magnonic and hybrid magnonic systems which can be understood through the lens of non-Hermitian physics, such as PT and Anti-PT-symmetry breaking, dynamical magnetic phase transitions, non-Hermitian skin effect, and the realization of exceptional points and surfaces. Finally, we comment on some open problems in the field and discuss areas for further exploration.
arXiv comment15 pages, 4 figures, invited Perspective article submitted to Journal of Applied Physics. Updated references and minor copyediting
References in corpus (93)
- Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
- Making Sense of Non-Hermitian Hamiltonians
- Edge states and topological invariants of non-Hermitian systems
- Enhanced Gilbert Damping in Thin Ferromagnetic Films
- Spin Transfer Torques
- Spin Caloritronics
- Exceptional Topology of Non-Hermitian Systems
- Non-Hermitian Physics
- Pseudo-Hermiticity versus PT Symmetry: The necessary condition for the reality of the spectrum of a non-Hermitian Hamiltonian
- Topological phases of non-Hermitian systems
- The physics of exceptional points
- PT-Symmetric Quantum Mechanics
- Symmetry and Topology in Non-Hermitian Physics
- Nonlocal magnetization dynamics in ferromagnetic heterostructures
- Strongly coupled magnons and cavity microwave photons
- Hybridizing ferromagnetic magnons and microwave photons in the quantum limit
- Dynamically encircling exceptional points in a waveguide: asymmetric mode switching from the breakdown of adiabaticity
- Lasing in topological edge states of a 1D lattice
- Spin pumping and magnetization dynamics in metallic multilayers
- Efficient Light Funneling based on the non-Hermitian Skin Effect
- Pseudo-Hermiticity versus PT-Symmetry II: A complete characterizatio n of non-Hermitian Hamiltonians with a real spectrum
- Pseudo-Hermiticity versus PT-Symmetry III: Equivalence of pseudo-Her miticity and the presence of antilinear symmetries
- Hybrid quantum systems based on magnonics
- Magnon-photon-phonon entanglement in cavity magnomechanics
- Theory of magnon-driven spin Seebeck effect
- Quantum magnonics: when magnon spintronics meets quantum information science
- Observation of non-Hermitian degeneracies in a chaotic exciton-polariton billiard
- Topological phases in the non-Hermitian Su-Schrieffer-Heeger model
- Weyl Exceptional Rings in a Three-Dimensional Dissipative Cold Atomic Gas
- Entanglement-based single-shot detection of a single magnon with a superconducting qubit
- Topological chiral magnonic edge mode in a magnonic crystal
- Universal non-Hermitian skin effect in two and higher dimensions
- Magnon dark modes and gradient memory
- Observation of the exceptional point in cavity magnon-polaritons
- Non-Hermitian Quantum Sensing: Fundamental Limits and Non-Reciprocal Approaches
- Level Attraction Due to Dissipative Magnon-Photon Coupling
- Spin pumping by parametrically excited exchange magnons
- Squeezed states of magnons and phonons in cavity magnomechanics
- Hybrid magnonics: physics, circuits and applications for coherent information processing
- Control and Local Measurement of the Spin Chemical Potential in a Magnetic Insulator
- Absence of topological insulator phases in non-Hermitian PT-symmetric Hamiltonians
- Topological invariance and global Berry phase in non-Hermitian systems
- Topological Magnons: A Review
- Entangling two magnon modes via magnetostrictive interaction
- Steady Bell state generation via magnon-photon coupling
- Magnon Blockade in a Hybrid Ferromagnet-Superconductor Quantum System
- Gigahertz frequency antiferromagnetic resonance and strong magnon-magnon coupling in the layered crystal CrCl3
- Experimental observation of exceptional surface in synthetic dimensions with magnon polaritons
- Mixed-state evolution in the presence of gain and loss
- Dissipation-based Quantum Sensing of Magnons with a Superconducting Qubit
- Higher-order exceptional point in a cavity magnonics system
- Coherent and Dissipative Cavity Magnonics
- Coherent coupling of two remote magnonic resonators mediated by superconducting circuits
- Observation of anti-PT symmetry phase transition in the magnon-cavity-magnon coupled system
- Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale
- Opportunities for long-range magnon-mediated entanglement of spin qubits via on- and off-resonant coupling
- Enhanced sensing of weak anharmonicities through coherences in dissipatively coupled anti-PT symmetric systems
- Strong coupling-enabled broadband non-reciprocity
- Tunable magnon-magnon coupling in synthetic antiferromagnets
- Long-Range Interaction of Spin-Qubits via Ferromagnets
- Nanomagnonic cavities for strong spin-magnon coupling
- Non-Hermitian topology of spontaneous magnon decay
- Topological Properties of a Coupled Spin-Photon System Induced by Damping
- Long-distance spin-spin coupling via floating gates
- Critical fluctuations at a many-body exceptional point
- Quantum-impurity relaxometry of magnetization dynamics
- Exceptional Point and Cross-Relaxation Effect in a Hybrid Quantum System
- Magnon blockade in a PT-symmetric-like cavity magnomechanical system
- Parity-time symmetry breaking in magnetic systems
- Antiferromagnetism emerging in a ferromagnet with gain
- Nonlinear non-Hermitian higher-order topological laser
- Nonabelian magnonics in antiferromagnets
- Chiral excitation of spin waves in ferromagnetic films
- Non-Hermiticity and topological invariants of magnon Bogoliubov-de Gennes systems
- Predicted strong coupling of solid-state spins via a single magnon mode
- Magnon Accumulation in Chirally Coupled Magnets
- Higher-order exceptional points in all-magnetic structures
- Exceptional points in dissipatively coupled spin dynamics
- Non-Hermitian skin effect in magnetic systems
- Non-Hermitian Topological End-Mode Lasing in Polariton Systems
- Chiral coupling of magnons in waveguides
- Self-hybridization and tunable magnon-magnon coupling in van der Waals synthetic magnets
- Non-Hermitian topology of one-dimensional spin-torque oscillator arrays
- Entangling Distant Spin qubits via a Magnetic Domain Wall
- Real spectra in non-Hermitian topological insulators
- Magnon Trap by Chiral Spin Pumping
- Spin-wave chirality and its manifestations in antiferromagnets
- Bose-Einstein Condensation of Magnons Pumped by the Bulk Spin Seebeck Effect
- Magnetic Resonance in Defect Spins mediated by Spin Waves
- Non-linear dynamics of the non-Hermitian Su-Schrieffer-Heeger model
- Chemical potential of an antiferromagnetic magnon gas
- Local thermomagnonic torques in two-fluid spin dynamics
- Origin of intrinsic Gilbert damping
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- Non-Hermitian Floquet Topological Matter -- A Review
- -symmetric, non-Hermitian quantum many-body physics -- a methodological perspective
- Dissipative Spin-wave Diode and Nonreciprocal Magnonic Amplifier
- Optimal Generators for Quantum Sensing
- Exceptional points as signatures of dynamical magnetic phase transitions
- Gain-Loss Coupled Systems
- Coherent control of magnon-polaritons using an exceptional point
- Hidden Critical Points in the Two-Dimensional model: Exact Numerical Study of a Complex Conformal Field Theory
- Solid-state platform for cooperative quantum dynamics driven by correlated emission
- Non-Hermitian dynamics of a two-spin system with PT symmetry
- Non-Hermitian Casimir effect of magnons
- Multitude of exceptional points in van der Waals magnets
- Level attraction from interference in two-tone driving
- Demonstration of a Tunable Non-Hermitian Nonlinear Microwave Dimer
- Hermitian and non-Hermitian topology in active matter
- Tunable Ultrafast Dynamics of Antiferromagnetic Vortices in Nanoscale Dots
- Non-Hermitian magnetic moment
- Semiclassical analysis of spin dynamics in the non-Hermitian Hubbard model
- Flux-modulated tunable interaction regimes in two strongly nonlinear oscillators