Cavity-induced chiral edge currents and spontaneous magnetization in two-dimensional electron systems
Physical Review B 106, 205114 (2022)
Cavity-induced chiral edge currents and spontaneous magnetization in two-dimensional electron systems
We consider a laterally confined two-dimensional electron gas (2DEG), placed inside a gyrotropic cavity. Splitting of the circularly polarized electromagnetic modes leads to the emergence of the ground-state spontaneous magnetization, anomalous Hall effect and chiral edge currents in 2DEG. We examine the dependence of the magnetization and edge current density on the system size for two particular cases of the confining potential: infinite wall and parabolic potentials. We show that paramagnetic and diamagnetic contributions to the edge currents have qualitatively different dependences on the system size. For sufficiently large systems the emergent magnetic moment scales with the number of particles and takes a universal value independent of the system shape, the form of confining potential, and the presence of interparticle interactions. These findings pave the route to the design quantum electrodynamic engineering of the material properties of the mesoscopic electron systems.
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- http://dx.doi.org/10.1103/PhysRevB.106.205114
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- http://arxiv.org/abs/arXiv:2204.13759