Eur. Phys. J. B 3, 263-270 (1998)
https://doi.org/10.1007/s100510050312

Transmission resonances in magnetic-barrier structures

¹ Department of Physics, Tsinghua University, Beijing 100084, P.R. China
² Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

Corresponding author: ^a guoy@phys.tsinghua.edu.cn

Received: 18 August 1997
Revised: 20 September 1997
Accepted: 13 October 1997
Published online: 15 May 1998

Abstract

Quantum transport properties of electrons in simple magnetic-barrier (MB) structures and in finite MB superlattices are investigated in detail. It is shown that there exists a transition of transmission resonances, i.e., from incomplete transmission resonances in simple MB structures consisting of unidentical blocks, to complete transmission resonances in comparatively complex MB structures (, n is the number of barriers). In simple unidentical block arrangements in double- and triple-MB structures we can also obtain complete transmission by properly adjusting parameters of the building blocks according to k_y-value (k_y is the wave vector in y direction). Strong suppression of the transmission and of the conductance is found in MB superlattices which are periodic arrangements of two different blocks. The resonance splitting effect in finite MB superlattices is examined. It is confirmed that the rule (i.e., for n-barrier tunneling the splitting would be -fold) obtained in periodic electric superlattices can be extended to periodically arranged MB superlattices of identical blocks through which electrons with tunnel, and it is no longer proper for electrons with to tunnel.