Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Steinhauer J"'
Publikováno v:
Phys. Rev. Lett. 111, 055301 (2013)
The Planck distribution of photons emitted by a black body led to the development of quantum theory. An analogous distribution of phonons should exist in a Bose-Einstein condensate. We observe this Planck distribution of thermal phonons in a 3D conde
Externí odkaz:
http://arxiv.org/abs/1307.2055
Publikováno v:
Phys. Rev. Lett. 110, 265301 (2013)
By a novel reciprocal space analysis of the measurement, we report a calibrated in situ observation of the bunching effect in a 3D ultracold gas. The calibrated measurement with no free parameters confirms the role of the exchange symmetry and the Ha
Externí odkaz:
http://arxiv.org/abs/1212.3794
Publikováno v:
Phys. Rev. Lett. 109, 195301 (2012)
We measure the oscillations of a standing wave of phonons in a Bose-Einstein condensate, thus obtaining the dispersion relation. We present the technique of short Bragg pulses, which stimulates the standing wave. The subsequent oscillations are obser
Externí odkaz:
http://arxiv.org/abs/1207.3440
Publikováno v:
Phys. Rev. Lett. 104, 113001 (2010)
We present an in-situ study of an optical lattice with tunneling and single lattice site resolution. This system provides an important step for realizing a quantum computer. The real-space images show the fluctuations of the atom number in each site.
Externí odkaz:
http://arxiv.org/abs/0903.3282
We study low momentum excitations of a Bose-Einstein condensate using a novel matter-wave interference technique. In time-of-flight expansion images we observe strong matter-wave fringe patterns. The fringe contrast is a sensitive spectroscopic probe
Externí odkaz:
http://arxiv.org/abs/cond-mat/0405222
We propose and demonstrate an echo method to reduce the inhomogeneous linewidth of Bogoliubov excitations, in a harmonically-trapped Bose-Einstein condensate. Our proposal includes the transfer of excitations with momentum +q to -q using a double two
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309584
The roton in a Bose-Einstein condensate is computed, both near and far from a Feshbach resonance. A low-density approximation is made, allowing for an analytic result. A Monte Carlo calculation shows that the roton is larger than predicted by the low
Externí odkaz:
http://arxiv.org/abs/cond-mat/0303375
We measure the response of an elongated Bose-Einstein condensate to a two-photon Bragg pulse. If the duration of the pulse is long, the total momentum transferred to the condensate exhibits a nontrivial behavior which reflects the structure of the un
Externí odkaz:
http://arxiv.org/abs/cond-mat/0209075
A dressed basis is used to calculate the dynamics of three-wave mixing between Bogoliubov quasi-particles in a Bose condensate. Due to the observed oscillations between different momenta modes, an energy splitting, analogous to the optical Mollow tri
Externí odkaz:
http://arxiv.org/abs/cond-mat/0208283
We report a measurement of the suppression of collisions of quasi-particles with ground state atoms within a Bose-Einstein condensate at low momentum. These collisions correspond to Beliaev damping of the excitations, in the previously unexplored reg
Externí odkaz:
http://arxiv.org/abs/cond-mat/0206234