Correlational Origin of the Roton Minimum

Autor:	Kalman, G. J., Hartmann, P., Golden, K. I., Filinov, A., Donko, Z.
Rok vydání:	2010
Předmět:	Condensed Matter - Quantum Gases Condensed Matter - Other Condensed Matter
Zdroj:	EPL, 90 (2010) 55002
Druh dokumentu:	Working Paper
DOI:	10.1209/0295-5075/90/55002
Popis:	We present compelling evidence supporting the conjecture that the origin of the roton in Bose-condensed systems arises from strong correlations between the constituent particles. By studying the two dimensional bosonic dipole systems a paradigm, we find that classical molecular dynamics (MD) simulations provide a faithful representation of the dispersion relation for a low- temperature quantum system. The MD simulations allow one to examine the effect of coupling strength on the formation of the roton minimum and to demonstrate that it is always generated at a sufficiently high enough coupling. Moreover, the classical images of the roton-roton, roton-maxon, etc. states also appear in the MD simulation spectra as a consequence of the strong coupling. Comment: 7 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1002.3516 Zobrazit plný text záznamu View this record from Arxiv