TY - JOUR
T1 - Nonequilibrium transport in T-shaped double quantum dots
T2 - Phonon emission without dephasing
AU - Ueda, Akiko
AU - Eto, Mikio
N1 - Funding Information:
This work was partly supported by the Strategic Information and Communications R&D Promotion Program (SCOPE) from the Ministry of Internal Affairs and Communications of Japan, and by a grant-in-aid for scientific research from the Japan Society for the Promotion of Science.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/3
Y1 - 2008/3
N2 - We theoretically study the effect of electron-phonon interaction on transport properties in T-shaped double quantum dots, in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). Nonequilibrium transport under finite bias is calculated using Keldysh Green function method. The differential conductance shows a dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot antibonding orbital. The phonon emission from dot 2 breaks the interference and reduces the dip in size. The phonon emission from dot 1, on the other hand, does not affect the interference at all. An experiment to observe this dephasing-free phonon emission is proposed.
AB - We theoretically study the effect of electron-phonon interaction on transport properties in T-shaped double quantum dots, in which one of the dots is connected to the external leads (dot 1) and the other is disconnected (dot 2). Nonequilibrium transport under finite bias is calculated using Keldysh Green function method. The differential conductance shows a dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot antibonding orbital. The phonon emission from dot 2 breaks the interference and reduces the dip in size. The phonon emission from dot 1, on the other hand, does not affect the interference at all. An experiment to observe this dephasing-free phonon emission is proposed.
KW - Dephasing
KW - Electron-phonon interaction
KW - Nonequilibrium transport
KW - Quantum dot
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U2 - 10.1016/j.physe.2007.09.156
DO - 10.1016/j.physe.2007.09.156
M3 - Article
AN - SCOPUS:39649125148
VL - 40
SP - 1602
EP - 1604
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 5
ER -