Open AccessImportance of Backscattering Effects in Ballistic Quantum Transport in Mesoscopic Ring Structures
Author(s) -
Shin Mincheol,
Park Kyoung Wan,
Lee Seongjae,
Lee ElHang
Publication year - 1997
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.97.0197.0046
Subject(s) - mesoscopic physics , physics , ballistic conduction , interference (communication) , conductance , weak localization , maxima and minima , ring (chemistry) , electron , amplitude , quantum interference , quantum , coherent backscattering , condensed matter physics , quantum mechanics , magnetoresistance , magnetic field , scattering , chemistry , computer science , telecommunications , channel (broadcasting) , mathematics , mathematical analysis , organic chemistry
We have found that in the ballistic electron transport in a ring structure, the junction‐backscattering contribution is critical for all the major features of the Aharonov‐Bohm‐type interference patterns. In particular, by considering the backscattering effect, we present new and clear interpretation about the physical origin of the secondary minima in the electrostatic Aharonov‐Bohm effect and that of the h /2 e oscillations when both the electric and magnetic potentials are present. We have devised a convenient scheme of expanding the conductance by the junction backscattering amplitude, which enables us to determine most important electron paths among infinitely many paths and to gain insight about their contributions to the interference patterns. Based on the scheme, we have identified various interesting interference phenomena in the ballistic ring structure and found that the backscattering effect plays a critical role in all of them.