Charge solitons and their dynamical mass in one-dimensional arrays of Josephson junctions

被引：10

作者：

Homfeld, Jens ^{[1
]}

Protopopov, Ivan ^{[2
,3
]}

Rachel, Stephan ^{[4
]}

Shnirman, Alexander ^{[1
,5
]}

机构：

[1] Karlsruhe Inst Technol, Inst Theorie Kondensierten Materie, D-76128 Karlsruhe, Germany

[2] Karlsruhe Inst Technol, Inst Nanotechnol, D-76021 Karlsruhe, Germany

[3] LD Landau Theoret Phys Inst, RU-119334 Moscow, Russia

[4] Yale Univ, Dept Phys, New Haven, CT 06520 USA

[5] Karlsruhe Inst Technol, DFG Ctr Funct Nanostruct CFN, D-76128 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 06期

关键词：

QUANTUM PHASE-TRANSITIONS; SINGLE COOPER PAIRS; TUNNEL-JUNCTIONS; VORTEX DYNAMICS; SUPERCONDUCTOR; INDUCTANCE;

D O I：

10.1103/PhysRevB.83.064517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate charge transport in one-dimensional arrays of Josephson junctions. In the interesting regime of "small charge solitons" (polarons), Lambda E-J > E-C > E-J, where Lambda is the (electrostatic) screening length, the charge dynamics are strongly influenced by the polaronic effects (i.e., by dressing of a Cooper pair by charge dipoles). In particular, the soliton's mass in this regime scales approximately as E-J(-2). We employ two theoretical techniques: the many-body tight-binding approach and the mean-field approach, and the results of the two approaches agree in the regime of "small charge solitons." Renormalization of the soliton's mass could be observed; for example, as enhancement of the persistent current in a ring-shaped array.

引用

页数：9