We report on stacked multiple quantum dots (QDs) formed inside inverted pyramidal recesses, which allow for the precise positioning of the QDs themselves. Specifically, we fabricated double QDs with varying inter-dot distances and ensembles with more than two nominally highly symmetric QDs. For each, the effect of the interaction between QDs is studied by characterizing a large number of QDs through photoluminescence spectroscopy. A clear red-shift of the emission energy is observed together with a change in the orientation of its polarization, suggesting an increasing interaction between the QDs. Finally, we show how stacked QDs can help influencing the charging of the excitonic complexes.

1.
P.
Michler
,
A.
Kiraz
,
C.
Becher
,
W. V.
Schoenfeld
,
P. M.
Petroff
,
L.
Zhang
,
E.
Hu
, and
A.
Imamoglu
, “
A quantum dot single-photon turnstile device
,”
Science
290
(
5500
),
2282
2285
(
2000
).
2.
C.
Santori
,
D.
Fattal
,
J.
Vučković
,
G. S.
Solomon
, and
Y.
Yamamoto
, “
Indistinguishable photons from a single-photon device
,”
Nature
419
(
6907
),
594
597
(
2002
).
3.
N.
Akopian
,
N. H.
Lindner
,
E.
Poem
,
Y.
Berlatzky
,
J.
Avron
,
D.
Gershoni
,
B. D.
Gerardot
, and
P. M.
Petroff
, “
Entangled photon pairs from semiconductor quantum dots
,”
Phys. Rev. Lett.
96
(
13
),
130501
(
2006
).
4.
Z.
Yuan
,
B. E.
Kardynal
,
R. M.
Stevenson
,
A. J.
Shields
,
C. J.
Lobo
,
K.
Cooper
,
N. S.
Beattie
,
D. A.
Ritchie
, and
M.
Pepper
, “
Electrically driven single-photon source
,”
Science
295
(
5552
),
102
105
(
2002
).
5.
C. L.
Salter
,
R. M.
Stevenson
,
I.
Farrer
,
C. A.
Nicoll
,
D. A.
Ritchie
, and
A. J.
Shields
, “
An entangled-light-emitting diode
,”
Nature
465
(
7298
),
594
597
(
2010
).
6.
Y. H.
Huo
,
B. J.
Witek
,
S.
Kumar
,
J. R.
Cardenas
,
J. X.
Zhang
,
N.
Akopian
,
R.
Singh
,
E.
Zallo
,
R.
Grifone
,
D.
Kriegner
,
R.
Trotta
,
F.
Ding
,
J.
Stangl
,
V.
Zwiller
,
G.
Bester
,
A.
Rastelli
, and
O. G.
Schmidt
, “
A light-hole exciton in a quantum dot
,”
Nat. Phys
10
(
1
),
46
51
(
2014
).
7.
V.
Jovanov
,
S.
Kapfinger
,
M.
Bichler
,
G.
Abstreiter
, and
J. J.
Finley
, “
Direct observation of metastable hot trions in an individual quantum dot
,”
Phys. Rev. B
84
(
23
),
235321
(
2011
).
8.
T.
Warming
,
E.
Siebert
,
A.
Schliwa
,
E.
Stock
,
R.
Zimmermann
, and
D.
Bimberg
, “
Hole-hole and electron-hole exchange interactions in single InAs/GaAs quantum dots
,”
Phys. Rev. B
79
(
12
),
125316
(
2009
).
9.
G. J.
Beirne
,
C.
Hermannstädter
,
L.
Wang
,
A.
Rastelli
,
O. G.
Schmidt
, and
P.
Michler
, “
Quantum light emission of two lateral tunnel-coupled (In, Ga) As/GaAs quantum dots controlled by a tunable static electric field
,”
Phys. Rev. Lett.
96
(
13
),
137401
(
2006
).
10.
H. J.
Krenner
,
M.
Sabathil
,
E. C.
Clark
,
A.
Kress
,
D.
Schuh
,
M.
Bichler
,
G.
Abstreiter
, and
J. J.
Finley
, “
Direct observation of controlled coupling in an individual quantum dot molecule
,”
Phys. Rev. Lett.
94
(
5
),
057402
(
2005
).
11.
G.
Ortner
,
M.
Bayer
,
Y.
Lyanda-Geller
,
T. L.
Reinecke
,
A.
Kress
,
J. P.
Reithmaier
, and
A.
Forchel
, “
Control of vertically coupled InGaAs/GaAs quantum dots with electric fields
,”
Phys. Rev. Lett.
94
(
15
),
157401
(
2005
).
12.
E. A.
Stinaff
,
M.
Scheibner
,
A. S.
Bracker
,
I. V.
Ponomarev
,
V. L.
Korenev
,
M. E.
Ware
,
M. F.
Doty
,
T. L.
Reinecke
, and
D.
Gammon
, “
Optical signatures of coupled quantum dots
,”
Science
311
(
5761
),
636
639
(
2006
).
13.
Q.
Xie
,
A.
Madhukar
,
P.
Chen
, and
N. P.
Kobayashi
, “
Vertically self-organized InAs quantum box islands on GaAs(100)
,”
Phys. Rev. Lett.
75
(
13
),
2542
2545
(
1995
).
14.
G.
Ortner
,
M.
Schwab
,
P.
Borri
,
W.
Langbein
,
U.
Woggon
,
M.
Bayer
,
S.
Fafard
,
Z.
Wasilewski
,
P.
Hawrylak
,
Y. B.
Lyanda-Geller
,
T. L.
Reinecke
, and
A.
Forchel
, “
Exciton states in self-assembled InAs/GaAs quantum dot molecules
,”
Physica E
25
(
2–3
),
249
260
(
2004
).
15.
A. J.
Bennett
,
M. A.
Pooley
,
R. M.
Stevenson
,
M. B.
Ward
,
R. B.
Patel
,
A. B.
de la Giroday
,
N.
Sköld
,
I.
Farrer
,
C. A.
Nicoll
,
D. A.
Ritchie
, and
A. J.
Shields
, “
Electric-field-induced coherent coupling of the exciton states in a single quantum dot
,”
Nat. Phys.
6
(
12
),
947
950
(
2010
).
16.
M. A.
Dupertuis
,
K. F.
Karlsson
,
D. Y.
Oberli
,
E.
Pelucchi
,
A.
Rudra
,
P. O.
Holtz
, and
E.
Kapon
, “
Symmetries and the polarized optical spectra of exciton complexes in quantum dots
,”
Phys. Rev. Lett.
107
(
12
),
127403
(
2011
).
17.
M.
Khoshnegar
,
T.
Huber
,
A.
Predojević
,
D.
Dalacu
,
M.
Prilmüller
,
J.
Lapointe
,
X.
Wu
,
P.
Tamarat
,
B.
Lounis
,
P.
Poole
,
G.
Weihs
, and
H.
Majedi
, “
A solid state source of photon triplets based on quantum dot molecules
,”
Nat. Commun.
8
,
15716
(
2017
).
18.
Q.
Zhu
,
K. F.
Karlsson
,
M.
Byszewski
,
A.
Rudra
,
E.
Pelucchi
,
Z.
He
, and
E.
Kapon
, “
Hybridization of electron and hole states in semiconductor quantum-dot molecules
,”
Small
5
(
3
),
329
335
(
2009
).
19.
G.
Juska
,
V.
Dimastrodonato
,
L. O.
Mereni
,
A.
Gocalinska
, and
E.
Pelucchi
, “
Towards quantum-dot arrays of entangled photon emitters
,”
Nat. Photonics
7
(
7
),
527
531
(
2013
).
20.
T. H.
Chung
,
G.
Juska
,
S. T.
Moroni
,
A.
Pescaglini
,
A.
Gocalinska
, and
E.
Pelucchi
, “
Selective carrier injection into patterned arrays of pyramidal quantum dots for entangled photon light-emitting diodes
,”
Nat. Photonics
10
(
12
),
782
787
(
2016
).
21.
S. E.
Economou
,
N.
Lindner
, and
T.
Rudolph
, “
Optically generated 2-dimensional photonic cluster state from coupled quantum dots
,”
Phys. Rev. Lett.
105
(
9
),
093601
(
2010
).
22.
M. H.
Baier
,
E.
Pelucchi
,
E.
Kapon
,
S.
Varoutsis
,
M.
Gallart
,
I.
Robert-Philip
, and
I.
Abram
, “
Single photon emission from site-controlled pyramidal quantum dots
,”
Appl. Phys. Lett.
84
(
5
),
648
650
(
2004
).
23.
L. O.
Mereni
,
V.
Dimastrodonato
,
R. J.
Young
, and
E.
Pelucchi
, “
A site-controlled quantum dot system offering both high uniformity and spectral purity
,”
Appl. Phys. Lett.
94
(
22
),
223121
(
2009
).
24.
V.
Dimastrodonato
,
E.
Pelucchi
, and
D. D.
Vvedensky
, “
Self-limiting evolution of seeded quantum wires and dots on patterned substrates
,”
Phys. Rev. Lett.
108
(
25
),
256102
(
2012
).
25.
S. T.
Moroni
,
V.
Dimastrodonato
,
T.-H.
Chung
,
G.
Juska
,
A.
Gocalinska
,
D. D.
Vvedensky
, and
E.
Pelucchi
, “
Indium segregation during III–V quantum wire and quantum dot formation on patterned substrates
,”
J. Appl. Phys.
117
(
16
),
164313
(
2015
).
26.
G.
Juska
,
E.
Murray
,
V.
Dimastrodonato
,
T. H.
Chung
,
S. T.
Moroni
,
A.
Gocalinska
, and
E.
Pelucchi
, “
Conditions for entangled photon emission from (111)B site-controlled pyramidal quantum dots
,”
J. Appl. Phys.
117
(
13
),
134302
(
2015
).
27.
G.
Bester
,
J.
Shumway
, and
A.
Zunger
, “
Theory of excitonic spectra and entanglement engineering in dot molecules
,”
Phys. Rev. Lett.
93
(
4
),
047401
(
2004
).
28.
G.
Juska
,
V.
Dimastrodonato
,
L. O.
Mereni
,
T. H.
Chung
,
A.
Gocalinska
,
E.
Pelucchi
,
B.
Van Hattem
,
M.
Ediger
, and
P.
Corfdir
, “
Complex optical signatures from quantum dot nanostructures and behavior in inverted pyramidal recesses
,”
Phys. Rev. B
89
(
20
),
205430
(
2014
).
29.
K. F.
Karlsson
,
V.
Troncale
,
D. Y.
Oberli
,
A.
Malko
,
E.
Pelucchi
,
A.
Rudra
, and
E.
Kapon
, “
Optical polarization anisotropy and hole states in pyramidal quantum dots
,”
Appl. Phys. Lett.
89
(
25
),
251113
(
2006
).
30.
R. M.
Stevenson
,
R. J.
Young
,
P.
See
,
C. E.
Norman
,
A. J.
Shields
,
P.
Atkinson
, and
D. A.
Ritchie
, “
Strong directional dependence of single-quantum-dot fine structure
,”
Appl. Phys. Lett.
87
(
13
),
133120
(
2005
).
31.
E.
Pelucchi
,
V.
Dimastrodonato
,
A.
Rudra
,
K.
Leifer
,
E.
Kapon
,
L.
Bethke
,
P. A.
Zestanakis
, and
D. D.
Vvedensky
, “
Decomposition, diffusion, and growth rate anisotropies in self-limited profiles during metalorganic vapor-phase epitaxy of seeded nanostructures
,”
Phys. Rev. B
83
(
20
),
205409
(
2011
).

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