Critical velocity, vortex shedding, and drag in a unitary Fermi superfluid

被引：2

作者：

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

Salasnich, L. ^{[1
,2
]}

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

机构：

[1] Univ Padua, Dipartimento Fis & Astron Galileo Galilei, I-35122 Padua, Italy

[2] Univ Padua, Consorzio Nazl Interuniv Sci Fis Mat, I-35122 Padua, Italy

[3] CNR, Ist Officina Mat Democritos, I-34136 Trieste, Italy

来源：

PHYSICAL REVIEW A | 2013年 / 87卷 / 01期

关键词：

ZERO-TEMPERATURE; REAL-TIME; VORTICES; BOSE;

D O I：

10.1103/PhysRevA.87.013637

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the real-time motion of a microscopic object in a cold Fermi gas at unitary conditions by using an extended Thomas-Fermi density functional approach. We find that the spontaneous creation of singly quantized vortex-antivortex pairs occurs as a critical velocity is exceeded, which leads to a drag between the moving object and the Fermi gas. The resulting force is linear in the velocity for subsonic motion and becomes quadratic for supersonic motion. DOI: 10.1103/PhysRevA.87.013637

引用

页数：6

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