Anisotropic Excitation Spectrum of a Dipolar Quantum Bose Gas

被引：72

作者：

Bismut, G. ^{[1
]}

Laburthe-Tolra, B. ^{[1
]}

Marechal, E. ^{[1
]}

Pedri, P. ^{[1
]}

Gorceix, O. ^{[1
]}

Vernac, L. ^{[1
]}

机构：

[1] Univ Paris 13, UMR CNRS 7538, Phys Lasers Lab, F-93430 Villetaneuse, France

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 15期

关键词：

EINSTEIN CONDENSATE;

D O I：

10.1103/PhysRevLett.109.155302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We measure the excitation spectrum of a dipolar chromium Bose-Einstein condensate with Raman-Bragg spectroscopy. The energy spectrum depends on the orientation of the dipoles with respect to the excitation momentum, demonstrating an anisotropy that originates from the dipole-dipole interactions between the atoms. We compare our results with the Bogoliubov theory based on the local density approximation and, at large excitation wavelengths, with the numerical simulations of the time-dependent Gross-Pitaevskii equation. Our results show an anisotropy of the speed of sound.

引用

页数：5

共 34 条

[1] Bose-Einstein Condensation of Erbium [J].

Aikawa, K. ;

Frisch, A. ;

Mark, M. ;

Baier, S. ;

Rietzler, A. ;

Grimm, R. ;

Ferlaino, F. .

PHYSICAL REVIEW LETTERS, 2012, 108 (21)

[2] Superfluid pairing in a polarized dipolar Fermi gas [J].

Baranov, MA ;

Mar'enko, MS ;

Rychkov, VS ;

Shlyapnikov, GV .

PHYSICAL REVIEW A, 2002, 66 (01) :10-136061

[3] All-optical production of chromium Bose-Einstein condensates [J].

Beaufils, Q. ;

Chicireanu, R. ;

Zanon, T. ;

Laburthe-Tolra, B. ;

Marechal, E. ;

Vernac, L. ;

Keller, J. -C. ;

Gorceix, O. .

PHYSICAL REVIEW A, 2008, 77 (06)

[4] Optimized loading of an optical dipole trap for the production of chromium BECs [J].

Bismut, G. ;

Pasquiou, B. ;

Ciampini, D. ;

Laburthe-Tolra, B. ;

Marechal, E. ;

Vernac, L. ;

Gorceix, O. .

APPLIED PHYSICS B-LASERS AND OPTICS, 2011, 102 (01) :1-9

[5] Collective Excitations of a Dipolar Bose-Einstein Condensate [J].

Bismut, G. ;

Pasquiou, B. ;

Marechal, E. ;

Pedri, P. ;

Vernac, L. ;

Gorceix, O. ;

Laburthe-Tolra, B. .

PHYSICAL REVIEW LETTERS, 2010, 105 (04)

[6]

Bismut G., 2012, THESIS U PARIS 13, V13

[7] Momentum transferred to a trapped Bose-Einstein condensate by stimulated light scattering [J].

Brunello, A ;

Dalfovo, F ;

Pitaevskii, L ;

Stringari, S ;

Zambelli, F .

PHYSICAL REVIEW A, 2001, 64 (06) :5

[8] Role of attractive interactions on Bose-Einstein condensation [J].

Dodd, RJ ;

Edwards, M ;

Williams, CJ ;

Clark, CW ;

Holland, MJ ;

Ruprecht, PA ;

Burnett, K .

PHYSICAL REVIEW A, 1996, 54 (01) :661-664

[9] 1977 RIETZ LECTURE - BOOTSTRAP METHODS - ANOTHER LOOK AT THE JACKKNIFE [J].

EFRON, B .

ANNALS OF STATISTICS, 1979, 7 (01) :1-26

[10] Collective oscillations of dipolar Bose-Einstein condensates and accurate comparison between contact and dipolar interactions [J].

Giovanazzi, S. ;

Santos, L. ;

Pfau, T. .

PHYSICAL REVIEW A, 2007, 75 (01)

← 1 2 3 4 →