New Challenges in Cavity Magnonics and Symmetry
A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".
Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 1443
Special Issue Editors
Interests: spintronics; spin cavitronics; biomagnetism; majorana
Special Issue Information
Dear Colleagues,
Cavity magnonics—the emerging interdiscipline of cavity quantum electrodynamics and magnonics—has been rapidly developing in recent years. Cavity magnon-polaritons (CMPs) are a new type of bosonic quasiparticles caused by the hybridization of magnons and cavity photons, which has been detected and characterized via the anti-crossing transmission spectrum. The entangled spin orientation and photon number state in CMPs enables an efficient quantum information transfer between photon and magnon via Rabi oscillation, which is promising for quantum computing.
Recently, non-Hermitian physics and parity-time symmetry have attracted considerable attention. The non-Hermitian Hamiltonians allow the entirely real spectrum as long as the combined parity (P) and time (T)-reversal symmetries are respected. The non-Hermitian singularities, called exceptional points, have been experimentally observed in the cavity magnonic system. Conventional CMPs have a finite lifetime due to the intrinsic losses of photons and magnons. Pumping the cavity to compensate the dissipation may extend the coherent time of a CMP and lead to a dynamical equilibrium. Such a system can be described by a non-Hermitian Hamiltonian, with the hallmark of a non-Hermitian system being the singularity degeneracy and a collapse of the dimensionality in the eigenspace. This property may significantly modify the properties of polaritonic modes and the transmission spectrum. PT-symmetric CMPs and more general non-Hermitian CMPs, such as anti-PT symmetric and anyonic-PT symmetric CMPs, are seeking opportunities toward both scientific curiosity and new technological innovations.
Dr. Yunshan Cao
Prof. Dr. Xiansi Wang
Guest Editors
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Keywords
- cavity magnonics
- cavity magnon polaritons
- strong coupling
- parity-time symmetry
- anti-parity–time symmetry
- anyonic-parity–time symmetry
- exceptional point
