Memoirs of the Faculty of Engineering, Okayama University
Published by Faculty of Enginerring, Okayama University

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Memoirs of the School of Engineering, Okayama University

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Intrinsic Bistability of Coupled Quantum Wires: Localization due to Many-Body Effects

東辻 浩夫 Department of Electrical and Electronic Engineering
Tachibana Hiroyuki Department of Electrical and Electronic Engineering
Hashimoto Seiji Department of Electrical and Electronic Engineering
奈良 重俊 Department of Electrical and Electronic Engineering
抄録
The ground state of a system of electrons accumulated in a pair of coupled symmetric quantum wires is analyzed on the basis of density functional theory. It is shown that, in a domain of physical parameters, electrons are localized in either of wires. The main contribution to the total energy of this system comes from the Hartree energy, or the electrostatic energy, and the exchange-correlation energy between electrons. The ground state is determined by a competition between these contributions: We have symmetric electron distributions when the Hartree energy dominates and asymmetric (localized) states are realized in the opposite case. This kind of simple system with bistable electronic states may be applied to semiconductor memory devices.
ISSN
0475-0071
NCID
AA10699856
NAID