The buildup process of an electron’s probability in a quantum dot coupled to two conducting leads is studied in the regime of strong electron–phonon interaction. Initially the electron occupies an eigenstate in one of the conducting leads. An analytical expression is obtained for the time dependence of the electron’s probability in the quantum dot using the Green’s-function technique. A significant enhancement in the buildup rate is found when there are phonons in the quantum dot at the beginning of the tunneling process. Strong enhancement is found when the electron energy equals the zero-phonon resonant tunneling peak. Speed enhancement in resonant tunneling devices can be achieved by using properly designed quantum dot structures.
REFERENCES
1.
J.
Villavencio
and R.
Romo
, Appl. Phys. Lett.
77
, 379
(2000
).2.
3.
4.
K. S.
Chan
, Appl. Phys. Lett.
83
, 692
(2003
).5.
E. N.
Economou
, Green’s Functions in Quantum Physics
, 2nd ed. (Springer
, New York, 1983
), Chap. 4.6.
D. M. T.
Kuo
and Y. C.
Chang
, Phys. Rev. B
66
, 085311
(2002
).7.
R.
Heitz
, I.
Mukhametzhanov
, O.
Stier
, A.
Madhukar
, and D.
Bimberg
, Phys. Rev. Lett.
83
, 4654
(1999
).8.
M.
Bissiri
, G.
Baldassarri
, H.
von Hogerstha
, A. S.
Bhatti
, M.
Capizzi
, and A.
Frova
, Phys. Rev. B
62
, 4642
(2000
).9.
M. A.
Odnoblyudov
, I. N.
Yassievich
, and K. A.
Chao
, Phys. Rev. Lett.
83
, 4884
(1999
).10.
K. J.
Yee
, K. G.
Lee
, E.
Ohl
, and D. S.
Kim
, Phys. Rev. Lett.
88
, 105501
(2002
).11.
A. V.
Bragas
, C.
Aku-Leh
, S.
Costantino
, A.
Ingale
, J.
Zhao
, and R.
Merlin
, Phys. Rev. B
69
, 205306
(2004
).12.
W.
Liang
et al., Appl. Phys. Lett.
82
, 1968
(2003
).13.
S. L.
Chuang
and N.
Holonyak
, Appl. Phys. Lett.
80
, 1270
(2002
).© 2005 American Institute of Physics.
2005
American Institute of Physics
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