TY - GEN

T1 - Influence of electron-phonon interaction on Fano resonance in Aharonov-Bohm interferometer

AU - Ueda, Akiko

AU - Eto, Mikio

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We theoretically study the effect of electron-phonon (e-ph) interaction on a Fano resonance in an Aharonov-Bohm interferometer with an embedded quantum dot. We examine the bias-voltage (V) dependence of the decoherence, using Keldysh Green function method and perturbation with respect to e-ph interaction. With optical phonons of energy ω0, only the elastic process takes place when eV < ω0, in which electrons emit and absorb phonons virtually. The process suppresses the resonant amplitude. When eV > ω0, the inelastic process is possible which is accompaniedby real emission of phonons. It results in the dephasing and broadens the resonant width. With acoustic phonons, the asymmetric shape of the Fano resonance grows like a symmetric one as the bias voltage increases, in qualitative accordance with experimental results.

AB - We theoretically study the effect of electron-phonon (e-ph) interaction on a Fano resonance in an Aharonov-Bohm interferometer with an embedded quantum dot. We examine the bias-voltage (V) dependence of the decoherence, using Keldysh Green function method and perturbation with respect to e-ph interaction. With optical phonons of energy ω0, only the elastic process takes place when eV < ω0, in which electrons emit and absorb phonons virtually. The process suppresses the resonant amplitude. When eV > ω0, the inelastic process is possible which is accompaniedby real emission of phonons. It results in the dephasing and broadens the resonant width. With acoustic phonons, the asymmetric shape of the Fano resonance grows like a symmetric one as the bias voltage increases, in qualitative accordance with experimental results.

KW - Aharonov-Bohm interferometer

KW - Decoherence

KW - Electron-phonon interaction

KW - Fano resonance

KW - Keldysh Green function

KW - Quantum dot

UR - http://www.scopus.com/inward/record.url?scp=77958477647&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77958477647&partnerID=8YFLogxK

U2 - 10.1063/1.2730152

DO - 10.1063/1.2730152

M3 - Conference contribution

AN - SCOPUS:77958477647

SN - 9780735403970

T3 - AIP Conference Proceedings

SP - 839

EP - 840

BT - Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B

T2 - 28th International Conference on the Physics of Semiconductors, ICPS 2006

Y2 - 24 July 2006 through 28 July 2006

ER -