Bose-Einstein condensation of dipolar excitons in double and single quantum wells

2008 ◽  
Vol 5 (7) ◽  
pp. 2379-2386 ◽  
Author(s):  
V. B. Timofeev ◽  
A. V. Gorbunov
Keyword(s):  
Quantum Wells ◽  
Einstein Condensation ◽  
Single Quantum ◽  
Bose Einstein Condensation ◽  
Bose Einstein

Bose-einstein condensation of exciton polaritons in high-Q planar microcavities with GaAs quantum wells

JETP Letters ◽  
2010 ◽  
Vol 92 (9) ◽  
pp. 595-599 ◽  
Author(s):  
V. D. Kulakovskii ◽  
A. V. Larionov ◽  
S. I. Novikov ◽  
S. Höfling ◽  
Ch. Schneider ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Einstein Condensation ◽  
Bose Einstein Condensation ◽  
High Q ◽  
Exciton Polaritons ◽  
Bose Einstein

Bose–Einstein condensation and superfluidity of trapped polaritons in graphene and quantum wells embedded in a microcavity

2010 ◽  
Vol 368 (1932) ◽  
pp. 5459-5482 ◽  
Author(s):  
Oleg L. Berman ◽  
Roman Ya. Kezerashvili ◽  
Yurii E. Lozovik ◽  
David W. Snoke
Keyword(s):  
Magnetic Field ◽  
Quantum Wells ◽  
Einstein Condensation ◽  
Two Dimensional ◽  
Rabi Splitting ◽  
Graphene Layers ◽  
Bose Einstein Condensation ◽  
Optical Microcavity ◽  
Superfluid Fraction ◽  
Bose Einstein

The theory for spontaneous coherence of short-lived quasiparticles in two-dimensional excitonic systems is reviewed, in particular, quantum wells (QWs) and graphene layers (GLs) embedded in microcavities. Experiments with polaritons in an optical microcavity have already shown evidence of Bose–Einstein condensation (BEC) in the lowest quantum state in a harmonic trap. The theory of BEC and superfluidity of the microcavity excitonic polaritons in a harmonic potential trap is presented. Along the way, we determine a general method for defining the superfluid fraction in a two-dimensional trap, within the angular momentum representation. We discuss BEC of magnetoexcitonic polaritons (magnetopolaritons) in a QW and GL embedded in an optical microcavity in high magnetic field. It is shown that Rabi splitting in graphene is tunable by the external magnetic field B , while in a QW the Rabi splitting does not depend on the magnetic field in the strong B  limit.

scholarly journals Coherence and Optical Emission from Bilayer Exciton Condensates

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
D. W. Snoke
Keyword(s):  
Quantum Wells ◽  
Long Range ◽  
Optical Emission ◽  
Range Order ◽  
Einstein Condensation ◽  
Long Range Order ◽  
Coupled Quantum Wells ◽  
Bose Einstein Condensation ◽  
Bose Einstein

Experiments aimed at demonstrating Bose-Einstein condensation of excitons in two types of experiments with bilayer structures (coupled quantum wells) are reviewed, with an emphasis on the basic effects. Bose-Einstein condensation implies the existence of a macroscopic coherence, also known as off-diagonal long-range order, and proposed tests and past claims for coherence in these excitonic systems are discussed.

Systems with Condensates and Pairing

2018 ◽  
Author(s):  
Klaus Morawetz
Keyword(s):  
Critical Parameters ◽  
Einstein Condensation ◽  
Cooper Pairs ◽  
Pair Breaking ◽  
Systematic Theory ◽  
Bose Einstein Condensation ◽  
T Matrix ◽  
The Stability ◽  
Bose Einstein

The Bose–Einstein condensation and appearance of superfluidity and superconductivity are introduced from basic phenomena. A systematic theory based on the asymmetric expansion of chapter 11 is shown to correct the T-matrix from unphysical multiple-scattering events. The resulting generalised Soven scheme provides the Beliaev equations for Boson’s and the Nambu–Gorkov equations for fermions without the usage of anomalous and non-conserving propagators. This systematic theory allows calculating the fluctuations above and below the critical parameters. Gap equations and Bogoliubov–DeGennes equations are derived from this theory. Interacting Bose systems with finite temperatures are discussed with successively better approximations ranging from Bogoliubov and Popov up to corrected T-matrices. For superconductivity, the asymmetric theory leading to the corrected T-matrix allows for establishing the stability of the condensate and decides correctly about the pair-breaking mechanisms in contrast to conventional approaches. The relation between the correlated density from nonlocal kinetic theory and the density of Cooper pairs is shown.

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