TY  - JOUR
A1  - Henkel, Carsten
A1  - Sauer, Tim-O
A1  - Proukakis, N. P.
T1  - Cross-over to quasi-condensation: mean-field theories and beyond
JF  - Journal of physics : B, Atomic, molecular and optical physics
N2  - We analyze the cross-over of a homogeneous, weakly interacting Bose gas in one dimension from the ideal gas into the dense quasi-condensate phase. We review a number of mean-field theories, perturbative or self-consistent, and provide accurate evaluations of equation of state, density fluctuations, and correlation functions. A smooth crossover is reproduced by classical-field simulations based on the stochastic Gross-Pitaevskii equation and the Yang-Yang solution to the one-dimensional Bose gas.
KW  - quantum gases
KW  - Bose-Einstein condensation
KW  - phase transition
KW  - critical fluctuations
Y1  - 2017
U6  - https://doi.org/10.1088/1361-6455/aa6888
SN  - 0953-4075
SN  - 1361-6455
VL  - 50
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  - 
TY  - JOUR
A1  - Schiefele, Juergen
A1  - Henkel, Carsten
T1  - Bosonic enhancement of spontaneous emission near an interface
JF  - Modern physics letters : A, Particles and fields, gravitation, cosmology, nuclear physics
N2  - We show how the spontaneous emission rate of an excited two-level atom placed in a trapped Bose-Einstein condensate of ground-state atoms is enhanced by bosonic stimulation. This stimulation depends on the overlap of the excited matter-wave packet with the macroscopically occupied condensate wave function, and provides a probe of the spatial coherence of the Bose gas. The effect can be used to amplify the distance-dependent decay rate of an excited atom near an interface.
KW  - Bose-Einstein condensation
KW  - Correlation function
KW  - Bosonic stimulation
KW  - Superradiance
KW  - Spontaneous decay
KW  - Cavity-quantum electrodynamics
Y1  - 2011
U6  - https://doi.org/10.1016/j.physleta.2010.11.058
SN  - 0375-9601
VL  - 375
IS  - 3
SP  - 680
EP  - 684
PB  - Elsevier
CY  - Amsterdam
ER  -