In this invited paper of the 28th International Conference of the Physics of Semiconductors (ICPS-28), we discuss the peculiar quantum electrodynamical properties of a semiconductor microcavity system, in which a cavity photon mode is strongly coupled to an intersubband transition of a doped quantum well system. In this kind of semiconductor system, it is possible to achieve an unprecedented ultrastrong coupling regime, in which the vacuum Rabi frequency is comparable to the electronic transition frequency. We discuss the anomalous quantum properties of the quantum ground state (a squeezed vacuum) and of the intersubband cavity polariton excitations. We address the role of dissipation and point out some future perspectives concerning the investigation of quantum vacuum radiation effects induced by an ultrafast time modulation of the quantum vacuum.

1.
Cavity Quantum Electrodynamics
, edited by
P. R.
Berman
(
Academic
,
Boston
,
1994
).
2.
J. M.
Raimond
,
M.
Brune
, and
S.
Haroche
,
Rev. Mod. Phys.
73
,
565
(
2001
).
3.
E. T.
Jaynes
and
F. W.
Cummings
,
Proc. IEEE
51
,
89
(
1963
).
4.
C.
Weisbuch
,
M.
Nishioka
,
A.
Ishikawa
, and
Y.
Arakawa
,
Phys. Rev. Lett.
69
,
3314
(
1992
).
5.
J. J.
Hopfield
,
Phys. Rev.
112
,
1555
(
1958
).
6.
J. P.
Reithmaier
 et al,
Nature
432
,
197
(
2004
);
[PubMed]
T.
Yoshie
 et al,
Nature
432
,
200
(
2004
);
[PubMed]
E.
Peter
 et al,
Phys. Rev. Lett.
95
,
067401
(
2005
).
[PubMed]
7.
D.
Dini
,
R.
Kohler
,
A.
Tredicucci
,
G.
Biasol
, and
L.
Sorba
,
Phys. Rev. Lett.
90
,
116401
(
2003
).
8.
E.
Dupont
,
H. C.
Liu
,
A. J.
SpringThorpe
,
W.
Lai
, and
M.
Extavour
,
Phys. Rev. B
68
,
245320
(
2003
).
9.
A. A.
Anappara
,
A.
Tredicucci
,
G.
Biasiol
, and
L.
Sorba
,
Appl. Phys. Lett.
87
,
051105
(
2005
).
10.
Intersubband Transitions in Quantum Wells
,
Physics and Device Applications I
, Semiconductors and Semimetals Vol.
62
, edited by
H. C.
Liu
and
F.
Capasso
(
Academic
,
San Diego
,
2000
).
11.
C.
Sirtori
,
F.
Capasso
,
J.
Faist
, and
S.
Scandolo
,
Phys. Rev. B
50
,
8663
(
1994
).
12.
A.
Liu
,
Phys. Rev. B
55
,
7101
(
1997
).
13.
C.
Ciuti
,
G.
Bastard
, and
I.
Carusotto
,
Phys. Rev. B
72
,
115303
(
2005
).
14.
C.
Ciuti
and
I.
Carusotto
,
Phys. Rev. A.
74
,
033811
(
2006
).
15.
M.
Artoni
and
J. L.
Birman
,
Phys. Rev. B
44
,
3736
(
1991
).
16.
P.
Schwendimann
and
A.
Quattropani
,
Europhys. Lett.
17
,
355
(
1992
).
17.
A. A.
Anappara
and
A.
Tredicucci
(unpublished).
18.
R.
Ferreira
and
G.
Bastard
,
Phys. Rev. B
40
,
1074
(
1989
).
19.
A. O.
Caldeira
and
A. J.
Leggett
,
Phys. Rev. Lett.
46
,
211
(
1981
).
20.
R.
Colombelli
,
C.
Ciuti
,
Y.
Chassagneux
, and
C.
Sirtori
,
Semicond. Sci. Technol.
20
,
985
(
2005
).
21.
L.
Sapienza
,
R.
Colombelli
,
A.
Vasanelli
,
C.
Ciuti
,
C.
Manquest
,
U.
Gennser
, and
C.
Sirtori
,
,
Appl. Phys. Lett.
(in press).
22.
For a recent review, see
A.
Lambrecht
,
J. Opt. B: Quantum Semiclassical Opt.
7
,
S3
(
2005
).
23.
S.
De Liberato
,
C.
Ciuti
, and
I.
Carusotto
,
Phys. Rev. Lett.
98
,
103602
(
2007
).
You do not currently have access to this content.