Anisotropic Eliashberg function and electron-phonon coupling in doped graphene

被引：45

作者：

Haberer, D. ^{[1
,2
]}

Petaccia, L. ^{[3
]}

Fedorov, A. V. ^{[1
,4
]}

Praveen, C. S. ^{[5
,6
]}

Fabris, S. ^{[5
,6
]}

Piccinin, S. ^{[5
,6
]}

Vilkov, O. ^{[4
,7
]}

Vyalikh, D. V. ^{[4
,7
]}

Preobrajenski, A. ^{[8
]}

Verbitskiy, N. I. ^{[9
,10
]}

Shiozawa, H. ^{[9
]}

Fink, J. ^{[1
]}

Knupfer, M. ^{[1
]}

Buechner, B. ^{[1
]}

Grueneis, A. ^{[1
,9
]}

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[3] Elettra Sincrotrone Trieste, I-34149 Trieste, Italy

[4] St Petersburg State Univ, St Petersburg 198504, Russia

[5] CNR IOM DEMOCRITOS Theory Elettra Grp, I-34136 Trieste, Italy

[6] SISSA, I-34136 Trieste, Italy

[7] Tech Univ Dresden, Inst Festkorperphys, D-01069 Dresden, Germany

[8] Lund Univ, Lab MAX 4, S-22100 Lund, Sweden

[9] Univ Vienna, Fac Phys, A-1090 Vienna, Austria

[10] Moscow MV Lomonosov State Univ, Dept Mat Sci, Moscow 119992, Russia

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 08期

关键词：

SUPERCONDUCTIVITY; GAP;

D O I：

10.1103/PhysRevB.88.081401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate, with high-resolution angle-resolved photoemission spectroscopy, the spectral function of potassium-doped quasi-free-standing graphene on Au. Angle-dependent x-ray photoemission and density functional theory calculations demonstrate that potassium intercalates into the graphene/Au interface, leading to an upshift of the K-derived electronic band above the Fermi level. This empty band is what makes this system perfectly suited to disentangle the contributions to electron-phonon coupling coming from the pi band and K-derived bands. From a self-energy analysis we find an anisotropic electron-phonon coupling strength lambda of 0.1 (0.2) for the K Gamma (K M) high-symmetry directions in momentum space, respectively. Interestingly, the high-energy part of the Eliashberg function which relates to graphene's optical phonons is equal in both directions but only in K M does an additional low-energy part appear.

引用

页数：5

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