Anisotropic Relaxation Dynamics in a Dipolar Fermi Gas Driven Out of Equilibrium

被引：31

作者：

Aikawa, K. ^{[1
,2
]}

Frisch, A. ^{[1
,2
]}

Mark, M. ^{[1
,2
]}

Baier, S. ^{[1
,2
]}

Grimm, R. ^{[1
,2
,3
]}

Bohn, J. L. ^{[4
,5
]}

Jin, D. S. ^{[4
,5
]}

Bruun, G. M. ^{[6
]}

Ferlaino, F. ^{[1
,2
,3
]}

机构：

[1] Univ Innsbruck, Inst Expt Phys, A-6020 Innsbruck, Austria

[2] Univ Innsbruck, Zentrum Quantenphys, A-6020 Innsbruck, Austria

[3] Austrian Acad Sci, Inst Quantenopt & Quanteninformat, A-6020 Innsbruck, Austria

[4] Univ Colorado, NIST, JILA, Boulder, CO 80309 USA

[5] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

[6] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 26期

基金：

欧洲研究理事会; 美国国家科学基金会; 奥地利科学基金会;

关键词：

BOSE-EINSTEIN CONDENSATION; ULTRACOLD COLLISIONS; QUANTUM; ATOMS; THRESHOLD; PHYSICS;

D O I：

10.1103/PhysRevLett.113.263201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the observation of a large anisotropy in the rethermalization dynamics of an ultracold dipolar Fermi gas driven out of equilibrium. Our system consists of an ultracold sample of strongly magnetic Er-167 fermions, spin polarized in the lowest Zeeman sublevel. In this system, elastic collisions arise purely from universal dipolar scattering. Based on cross-dimensional rethermalization experiments, we observe a strong anisotropy of the scattering, which manifests itself in a large angular dependence of the thermal relaxation dynamics. Our result is in good agreement with recent theoretical predictions. Furthermore, we measure the rethermalization rate as a function of temperature for different angles and find that the suppression of collisions by Pauli blocking is not influenced by the dipole orientation.

引用

页数：5

共 30 条

[1] Observation of Fermi surface deformation in a dipolar quantum gas [J].

Aikawa, K. ;

Baier, S. ;

Frisch, A. ;

Mark, M. ;

Ravensbergen, C. ;

Ferlaino, F. .

SCIENCE, 2014, 345 (6203) :1484-1487

[2] Reaching Fermi Degeneracy via Universal Dipolar Scattering [J].

Aikawa, K. ;

Frisch, A. ;

Mark, M. ;

Baier, S. ;

Grimm, R. ;

Ferlaino, F. .

PHYSICAL REVIEW LETTERS, 2014, 112 (01)

[3] 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)

[4] OBSERVATION OF BOSE-EINSTEIN CONDENSATION IN A DILUTE ATOMIC VAPOR [J].

ANDERSON, MH ;

ENSHER, JR ;

MATTHEWS, MR ;

WIEMAN, CE ;

CORNELL, EA .

SCIENCE, 1995, 269 (5221) :198-201

[5]

[Anonymous], 2002, BOSE EINSTEIN CONDEN

[6] Condensed Matter Theory of Dipolar Quantum Gases [J].

Baranov, M. A. ;

Dalmonte, M. ;

Pupillo, G. ;

Zoller, P. .

CHEMICAL REVIEWS, 2012, 112 (09) :5012-5061

[7] Quasi-universal dipolar scattering in cold and ultracold gases [J].

Bohn, J. L. ;

Cavagnero, M. ;

Ticknor, C. .

NEW JOURNAL OF PHYSICS, 2009, 11

[8] Differential scattering and rethermalization in ultracold dipolar gases [J].

Bohn, John L. ;

Jin, Deborah S. .

PHYSICAL REVIEW A, 2014, 89 (02)

[9] Viscosity and thermal relaxation for a resonantly interacting Fermi gas [J].

Bruun, GM ;

Smith, H .

PHYSICAL REVIEW A, 2005, 72 (04)

[10] Cold and ultracold molecules: science, technology and applications [J].

Carr, Lincoln D. ;

DeMille, David ;

Krems, Roman V. ;

Ye, Jun .

NEW JOURNAL OF PHYSICS, 2009, 11

← 1 2 3 →