Physics – Condensed Matter – Quantum Gases
Scientific paper
2009-08-27
Phys.Rev.Lett.103:230403,2009
Physics
Condensed Matter
Quantum Gases
Accepted for publication in PRL, Nov 12, 2009
Scientific paper
10.1103/PhysRevLett.103.230403
We study solitary wave propagation in the condensate of a system of hard-core bosons with nearest-neighbor interactions. For this strongly repulsive system, the evolution equation for the condensate order parameter of the system, obtained using spin coherent state averages is different from the usual Gross-Pitaevskii equation (GPE). The system is found to support two kinds of solitons when there is a particle-hole imbalance: a dark soliton that dies out as the velocity approaches the sound velocity, and a new type of soliton which brightens and persists all the way up to the sound velocity, transforming into a periodic wave train at supersonic speed. Analogous to the GPE soliton, the energy-momentum dispersion for both solitons is characterized by Lieb II modes.
Balakrishnan Radha
Clark Charles W.
Satija Indubala I.
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