scholarly journals Exciton Liquid in Coupled Quantum Wells

Science ◽  
2014 ◽  
Vol 343 (6166) ◽  
pp. 55-57 ◽  
Author(s):  
Michael Stern ◽  
Vladimir Umansky ◽  
Israel Bar-Joseph
Keyword(s):  
Gallium Arsenide ◽  
Quantum Wells ◽  
Critical Density ◽  
Electrical Conductance ◽  
Repulsive Interaction ◽  
Coupled Quantum Wells ◽  
Photogenerated Electrons ◽  
Electron Hole Plasma ◽  
Photoluminescence Line ◽  
Two Phases

Excitons in semiconductors may form correlated phases at low temperatures. We report the observation of an exciton liquid in gallium arsenide/aluminum gallium arsenide–coupled quantum wells. Above a critical density and below a critical temperature, the photogenerated electrons and holes separate into two phases: an electron-hole plasma and an exciton liquid, with a clear sharp boundary between them. The two phases are characterized by distinct photoluminescence spectra and by different electrical conductance. The liquid phase is formed by the repulsive interaction between the dipolar excitons and exhibits a short-range order, which is manifested in the photoluminescence line shape.

scholarly journals TRIONS IN COUPLED QUANTUM WELLS AND WIGNER CRYSTALLIZATION

2014 ◽  
Vol 28 (09) ◽  
pp. 1450064 ◽  
Author(s):  
OLEG L. BERMAN ◽  
ROMAN YA. KEZERASHVILI ◽  
SHALVA M. TSIKLAURI
Keyword(s):  
Quantum Wells ◽  
Critical Density ◽  
Wigner Crystal ◽  
Three Body Problem ◽  
Bohr Radius ◽  
Cluster Approach ◽  
Conditional Probability Distribution ◽  
Coupled Quantum Wells ◽  
The Third ◽  
Three Body

We consider a restricted three-body problem, where two interacted particles are located in a two-dimensional (2D) plane and interact with the third one located in the parallel spatially separated plane. The system of such type can be formed in the semiconductor coupled quantum wells, where the electrons (holes) and direct excitons spatially separated in different parallel neighboring quantum wells are sufficiently close to interact and form negative X- or positive X+ indirect trions. It is shown that at large interwell separations, when the interwell separation is much greater than the exciton Bohr radius, this problem can be solved analytically using the cluster approach. Analytical results for the energy spectrum and the wavefunctions of the spatially indirect trion are obtained, their dependencies on the interwell separations is analyzed and a conditional probability distribution is calculated. The formation of 2D Wigner crystal of trions at the low densities is predicted. It is shown that the critical density of the formation of the trion Wigner crystal is sufficiently greater than the critical density of the electron Wigner crystal in the same material.

Detection of Intersubband Transitions in Gallium Arsenide Coupled Quantum Wells by Hot Electron Effects

1997 ◽  
Vol 204 (1) ◽  
pp. 166-169 ◽  
Author(s):  
A. M. Tomlinson ◽  
C. C. Chang ◽  
R. J. Stone ◽  
C. T. Foxon ◽  
R. J. Nicholas ◽  
...  
Keyword(s):  
Gallium Arsenide ◽  
Quantum Wells ◽  
Hot Electron ◽  
Intersubband Transitions ◽  
Coupled Quantum Wells ◽  
Electron Effects

Theory of Light-Induced Drift of Electrons in Coupled Quantum Wells

1992 ◽  
Author(s):  
Mark I. Stockman ◽  
Leonid S. Muratov ◽  
Thomas F. George
Keyword(s):  
Quantum Wells ◽  
Coupled Quantum Wells

Study of electron-related intersubband optical properties in three coupled quantum wells wires with triangular transversal section

2015 ◽  
Vol 87 ◽  
pp. 131-136 ◽  
Author(s):  
A. Tiutiunnyk ◽  
V. Tulupenko ◽  
V. Akimov ◽  
R. Demediuk ◽  
A.L. Morales ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wells ◽  
Coupled Quantum Wells ◽  
Transversal Section

Luminescence studies of resonant tunneling in a triple barrier structure with strongly coupled quantum wells

1994 ◽  
Vol 37 (4-6) ◽  
pp. 721-724 ◽  
Author(s):  
T.S. Turner ◽  
P.M. Martin ◽  
L. Eaves ◽  
H.B. Evans ◽  
P.A. Harrison ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Resonant Tunneling ◽  
Barrier Structure ◽  
Coupled Quantum Wells ◽  
Strongly Coupled

Spin-dependent transport and spin polarization in coupled quantum wells

2008 ◽  
Vol 104 (6) ◽  
pp. 064321
Author(s):  
Genhua Liu ◽  
Yonghai Chen ◽  
Yu Liu ◽  
Caihong Jia ◽  
Zhanguo Wang
Keyword(s):  
Quantum Wells ◽  
Spin Polarization ◽  
Coupled Quantum Wells ◽  
Spin Dependent Transport ◽  
Dependent Transport
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