Non-KAM classical chaos topology for electrons in superlattice minibands determines the inter-well quantum transition rates

F Wang; M T Greenaway; A G Balanov; T M Fromhold

doi:10.1038/s41598-024-52351-6

Non-KAM classical chaos topology for electrons in superlattice minibands determines the inter-well quantum transition rates

Sci Rep. 2024 Mar 4;14(1):5269. doi: 10.1038/s41598-024-52351-6.

Authors

F Wang¹, M T Greenaway², A G Balanov², T M Fromhold³

Affiliations

¹ School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK.
² Department of Physics, Loughborough University, Loughborough, LE11 3TU, UK.
³ School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, UK. mark.fromhold@nottingham.ac.uk.

Abstract

We investigate the quantum-classical correspondence for a particle tunnelling through a periodic superlattice structure with an applied bias voltage and an additional tilted harmonic oscillator potential. We show that the quantum mechanical tunnelling rate between neighbouring quantum wells of the superlattice is determined by the topology of the phase trajectories of the analogous classical system. This result also enables us to estimate, with high accuracy, the tunnelling rate between two spatially displaced simple harmonic oscillator states using a classical model, and thus gain new insight into this generic quantum phenomenon. This finding opens new directions for exploring and understanding the quantum-classical correspondence principle and quantum jumps between displaced harmonic oscillators, which are important in many branches of natural science.