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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 3 Issue 2 (1998) pp 263-270
Transmission resonances in magnetic-barrier structures
Y. Guo (1)(2) (a), Z.-Q. Li (2), B.-L. Gu (1), Q. Sun (2), J.-Z. Yu (2), Y. Kawazoe (2)
(1) Department of Physics, Tsinghua University, Beijing 100084, P.R. China
(2) Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Received: 18 August 1997 / Revised: 20 September 1997 / Accepted: 13 October 1997
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 ($n\geq 4$, 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 ky-value (ky 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 (n-1)-fold) obtained in periodic electric superlattices can be extended to periodically arranged MB superlattices of identical blocks through which electrons with $k_y\geq 0$ tunnel, and it is no longer proper for electrons with ky<0 to tunnel.
PACS. 73.40.Gk Tunneling - 03.65.Ge Solutions of wave equations: bound states
(a) email: guoy@phys.tsinghua.edu.cn
Article in PDF-Format (371 KB)
Online publication: July 9, 1998
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