253 citations · 524 across the 8 of their papers we have counts for
8 papers
Spatial correlation of two-dimensional Bosonic multi-mode condensates
Wolfgang H. Nitsche, Na Young Kim, Georgios Roumpos +4
We studied the spatial coherence of a Bosonic two-dimensional multi-mode condensate both through measurements and simulations. It is shown that condensates with a constant spatial…
Algebraic order and the Berezinskii-Kosterlitz-Thouless transition in an exciton-polariton gas
Wolfgang H. Nitsche, Na Young Kim, Georgios Roumpos +5
We observe quasi-long range coherence in a two-dimensional condensate of exciton-polaritons. Our measurements are the first to confirm that the spatial correlation algebraically de…
Vortex-antivortex pair dynamics in an exciton-polariton condensate
M. D. Fraser, G. Roumpos, Y. Yamamoto
The study of superfluid and Berezinskii-Kosterlitz-Thouless phases in exciton-polaritons requires an understanding of vortex dynamics in a dissipative unconfined condensate. In thi…
Single vortex-antivortex pair in an exciton polariton condensate
Georgios Roumpos, Michael D. Fraser, Andreas Löffler +3
In a homogeneous two-dimensional system at non-zero temperature, although there can be no ordering of infinite range, a superfluid phase is predicted for a Bose liquid. The stabili…
Gain-induced trapping of microcavity exciton polariton condensates
Georgios Roumpos, Wolfgang H. Nitsche, Sven Hoefling +2
We have performed real and momentum space spectroscopy of exciton polariton condensates in a GaAs-based microcavity under non-resonant excitation with an intensity stabilized laser…
Signature of the microcavity exciton-polariton relaxation mechanism in the polarization of emitted light
Georgios Roumpos, Chih-Wei Lai, T. C. H. Liew +3
We have performed real and momentum space spin-dependent spectroscopy of spontaneously formed exciton polariton condensates for a non-resonant pumping scheme. Under linearly polari…
GaAs Microcavity Exciton-Polaritons in a Trap
Na Young Kim, Chih-Wei Lai, Shoko Utsunomiya +8
We present a simple method to create an in-plane lateral potential in a semiconductor microcavity using a metal thin-film. Two types of potential are produced: a circular aperture…
Quantum simulation of spin ordering with nuclear spins in a solid state lattice
Georgios Roumpos, Cyrus P. Master, Yoshihisa Yamamoto
An experiment demonstrating the quantum simulation of a spin-lattice Hamiltonian is proposed. Dipolar interactions between nuclear spins in a solid state lattice can be modulated b…