Volume 115, Number 2, July 2016
|Number of page(s)||7|
|Published online||19 August 2016|
A robust relativistic quantum two-level system with edge-dependent currents and spin polarization
1 School of Electrical, Computer and Energy Engineering, Arizona State University - Tempe, AZ 85287, USA
2 Institute of Computational Physics and Complex Systems, and Key Laboratory for Magnetism and Magnetic Materials of MOE, Lanzhou University - Lanzhou, Gansu 730000, China
3 Department of Physics, Arizona State University - Tempe, AZ 85287, USA
Received: 17 June 2016
Accepted: 27 July 2016
We consider a class of relativistic quantum systems of ring geometry with mass confinement, subject to a magnetic flux. Such a system supports a family of boundary modes with edge-dependent currents and spin polarization as the spinor-wave analog of the whispering-gallery modes. While these states are remarkably robust against random scattering, boundary deformations and/or bulk disorders can couple the two oppositely circulating base states. Superposition of the two states can be realized by sweeping an external magnetic flux. We also address the issue of decoherence and articulate a possible experimental scheme based on 3D topological insulators.
PACS: 05.45.Mt – Quantum chaos; semiclassical methods / 73.23.Ra – Persistent currents / 03.65.Pm – Relativistic wave equations
© EPLA, 2016
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