Excitation spectrum of a two-dimensional long-range Bose liquid with supersymmetry
Abstract
We have studied the excitation spectrum of the specific two-dimensional model of strongly interacting Bose particles via mapping of the many-body Schrödinger equation in imaginary time to the classical stochastic dynamics. In a broad range of coupling strengths α, a roton-like spectrum is found, with the roton gap being extremely small in natural units. A single quantum phase transition between a strongly correlated superfluid and a quantum Berezinsky crystal is found.
- Publication:
-
Physical Review B
- Pub Date:
- March 2011
- DOI:
- 10.1103/PhysRevB.83.104515
- arXiv:
- arXiv:1012.0482
- Bibcode:
- 2011PhRvB..83j4515M
- Keywords:
-
- 05.30.Jp;
- 05.10.Gg;
- 74.25.Uv;
- Boson systems;
- Stochastic analysis methods;
- Condensed Matter - Superconductivity;
- Condensed Matter - Statistical Mechanics
- E-Print:
- 6 pages, 6 figures