Semiconductor self-assembled quantum dots (SAQDs) normally have zero-dimensional properties, but become coupled and acquire higher-dimensional character if the distance between the dots is small. Using photoluminescence spectroscopy under high hydrostatic pressure, we have obtained clear evidence for electronic coupling due to quantum-mechanical tunneling in stacks of SAQDs. We demonstrate that application of pressure allows controllable tuning and suppression of the electronic coupling. The effect originates from a pressure-induced increase in the effective mass of -electrons and a related increase in the interdot-barrier height.
REFERENCES
1.
D.
Bimberg
, M.
Grundmann
, and N. N.
Ledentsov
, Quantum Dot Heterostructures
(Wiley
, New York, 1999
).2.
Single Quantum Dots. Fundamentals, Applications and New Concepts
, edited by P.
Michler
, in Topics in Applied Physics Vol. 90
(Springer
, Berlin, 2003
).3.
R.
Nötzel
, Semicond. Sci. Technol.
11
, 1365
(1996
).4.
D.
Bimberg
, M.
Grundmann
, F.
Heinrichsdorff
, N. N.
Ledentsov
, V. M.
Ustinov
, A. E.
Zhukov
, A. R.
Kovsh
, M. V.
Maximov
, Y. M.
Shernyakov
, B. V.
Volovik
, A. F.
Tsatsul’nikov
, P. S.
Kop’ev
, and Z. I.
Alferov
, Thin Solid Films
367
, 235
(2000
), and references therein.5.
M. A.
Migliorato
, L. R.
Wilson
, D. J.
Mowbray
, M. S.
Skolnick
, M.
Al-Khafaji
, A. G.
Cullis
, and M.
Hopkinson
, J. Appl. Phys.
90
, 6374
(2001
).6.
S. A.
Crooker
, J. A.
Hollingworth
, S.
Tretiak
, and V. I.
Klimov
, Phys. Rev. Lett.
89
, 186802
(2002
).
[PubMed]
7.
P.
Perlin
, W.
Trzeciakowski
, E.
Litwin-Staszewska
, J.
Muszalski
, and M.
Micovic
, Semicond. Sci. Technol.
9
, 2239
(1994
).8.
I. E.
Itskevich
, M.
Henini
, H. A.
Carmona
, L.
Eaves
, P. C.
Main
, D. K.
Maude
, and J.-C.
Portal
, Appl. Phys. Lett.
70
, 505
(1997
);I. E.
Itskevich
, S. G.
Lyapin
, I. A.
Troyan
, P. C.
Klipstein
, L.
Eaves
, P. C.
Main
, and M.
Henini
, Phys. Rev. B
58
, R4250
(1998
).9.
A. J.
Williamson
and A.
Zunger
, Phys. Rev. B
58
, 6724
(1998
).10.
G.
Bastard
, Wave Mechanics Applied to Semiconductor Heterostructures
(Les Editions de Physique
, Paris, 1988
).11.
C.
Pryor
, Phys. Rev. Lett.
80
, 3579
(1998
).12.
W.
Sheng
and J.-P.
Leburton
, Appl. Phys. Lett.
78
, 1258
(2001
).13.
B.
Szafran
, S.
Bednarek
, and J.
Adamowski
, Phys. Rev. B
64
, 125301
(2001
).14.
M.
Korkusinski
and P.
Hawrilak
, Phys. Rev. B
63
, 195311
(2001
).15.
M.
Bayer
, P.
Hawrilak
, K.
Hinzer
, S.
Fafard
, M.
Korkusinski
, Z. R.
Wasilewski
, O.
Stern
, and A.
Forchel
, Science
291
, 451
(2001
).16.
M. H.
Son
, J. H.
Oh
, D. Y.
Jeong
, D.
Ahn
, M. S.
Sun
, S. W.
Hwang
, J. E.
Oh
, and L. W.
Engel
, Appl. Phys. Lett.
82
, 1230
(2003
).© 2005 American Institute of Physics.
2005
American Institute of Physics
You do not currently have access to this content.