Volume 120, Number 2, October 2017
|Number of page(s)||6|
|Published online||02 January 2018|
Asymmetric scattering by non-Hermitian potentials
1 Department of Physics, University College Cork - Cork, Ireland
2 Departamento de Química Física, UPV/EHU - Apdo. 644, 48080 Bilbao, Spain
Received: 21 November 2017
Accepted: 18 December 2017
The scattering of quantum particles by non-Hermitian (generally non-local) potentials in one dimension may result in asymmetric transmission and/or reflection from left and right incidence. After extending the concept of symmetry for non-Hermitian potentials, eight generalized symmetries based on the discrete Klein's four-group (formed by parity, time reversal, their product, and unity) are found. Together with generalized unitarity relations they determine selection rules for the possible and/or forbidden scattering asymmetries. Six basic device types are identified when the scattering coefficients (squared moduli of scattering amplitudes) adopt zero/one values, and transmission and/or reflection are asymmetric. They can pictorically be described as a one-way mirror, a one-way barrier (a Maxwell pressure demon), one-way (transmission or reflection) filters, a mirror with unidirectional transmission, and a transparent, one-way reflector. We design potentials for these devices and also demonstrate that the behavior of the scattering coefficients can be extended to a broad range of incident momenta.
PACS: 03.65.Nk – Scattering theory / 11.30.Er – Charge conjugation, parity, time reversal, and other discrete symmetries / 03.67.-a – Quantum information
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