Leggett Modes and the Anderson-Higgs Mechanism in Superconductors without Inversion Symmetry

被引：18

作者：

Bittner, Nikolaj ^{[1
]}

Einzel, Dietrich ^{[2
]}

Klam, Ludwig ^{[3
]}

Manske, Dirk ^{[1
]}

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Walther Meissner Inst Tieftemp Forsch, D-85748 Garching, Germany

[3] ETH, Theoret Phys, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 22期

基金：

瑞士国家科学基金会;

关键词：

2-BAND SUPERCONDUCTORS; PHASES;

D O I：

10.1103/PhysRevLett.115.227002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We develop a microscopic and gauge-invariant theory for collective modes resulting from the phase of the superconducting order parameter in noncentrosymmetric superconductors. Considering various crystal symmetries, we derive the corresponding gauge mode.Gdq_ and find, in particular, new Leggett modes omega(L)(q) with characteristic properties that are unique to noncentrosymmetric superconductors. We calculate their mass and dispersion that reflect the underlying spin-orbit coupling and thus the balance between triplet and singlet superconductivity occurring simultaneously. Finally, we demonstrate the role of the Anderson-Higgs mechanism: while the long-range Coulomb interaction shifts omega(G)(q) to the condensate plasma mode omega(P)(q), it leaves the mass Lambda(0) of the new Leggett mode unaffected and only slightly modifies its dispersion.

引用

页数：5

共 24 条

[1] PLASMONS, GAUGE INVARIANCE, AND MASS [J].

ANDERSON, PW .

PHYSICAL REVIEW, 1963, 130 (01) :439-&

[2] Heavy fermion superconductivity and magnetic order in noncentrosymmetric CePt3Si -: art. no. 027003 [J].

Bauer, E ;

Hilscher, G ;

Michor, H ;

Paul, C ;

Scheidt, EW ;

Gribanov, A ;

Seropegin, Y ;

Noël, H ;

Sigrist, M ;

Rogl, P .

PHYSICAL REVIEW LETTERS, 2004, 92 (02) :4

[3]

Bauer E., 2012, NONCENTROSYMMETRIC S

[4] TRANSPORT EQUATIONS IN CLEAN SUPERCONDUCTORS [J].

BETBEDERMATIBET, O ;

NOZIERES, P .

ANNALS OF PHYSICS, 1969, 51 (03) :392-+

[5]

Bittner N., 2012, THESIS

[6] Two-Fluid Description of Two-Band Superconductors [J].

Bittner, Nikolaj ;

Einzel, Dietrich .

JOURNAL OF LOW TEMPERATURE PHYSICS, 2014, 174 (3-4) :184-206

[7] Observation of Leggett's collective mode in a multiband MgB2 superconductor [J].

Blumberg, G. ;

Mialitsin, A. ;

Dennis, B. S. ;

Klein, M. V. ;

Zhigadlo, N. D. ;

Karpinski, J. .

PHYSICAL REVIEW LETTERS, 2007, 99 (22)

[8]

Dzyaloshinskii I. E., 1958, PHYS REV, V4, P241

[9] Superconductivity without inversion symmetry:: MnSi versus CePt3Si -: art. no. 097001 [J].

Frigeri, PA ;

Agterberg, DF ;

Koga, A ;

Sigrist, M .

PHYSICAL REVIEW LETTERS, 2004, 92 (09) :097001-1

[10] BROKEN SYMMETRIES + MASSES OF GAUGE BOSONS [J].

HIGGS, PW .

PHYSICAL REVIEW LETTERS, 1964, 13 (16) :508-+

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