Extended van Hove Singularity and Superconducting Instability in Doped Graphene

被引：307

作者：

McChesney, J. L. ^{[1
,2
]}

Bostwick, Aaron ^{[1
]}

Ohta, Taisuke ^{[1
,3
]}

Seyller, Thomas ^{[4
]}

Horn, Karsten ^{[3
]}

Gonzalez, J. ^{[5
]}

Rotenberg, Eli ^{[1
]}

机构：

[1] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[2] Montana State Univ, Bozeman, MT 59717 USA

[3] Max Planck Gesell, Fritz Haber Inst, D-1000 Berlin, Germany

[4] Univ Erlangen Nurnberg, Inst Phys Kondensierten Mat, Erlangen, Germany

[5] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 13期

关键词：

ELECTRONIC-STRUCTURE; GRAPHITE; PHOTOEMISSION; PSEUDOGAPS; MECHANISM; SCENARIO; STATE; CAC6; C6CA;

D O I：

10.1103/PhysRevLett.104.136803

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the effects of doping on a single layer of graphene using angle-resolved photoemission spectroscopy. We show that many-body interactions severely warp the Fermi surface, leading to an extended van Hove singularity (EVHS) at the graphene M point. The ground state properties of graphene with such an EVHS are calculated, analyzing the competition between a magnetic instability and the tendency towards superconductivity. We find that the latter plays the dominant role as it is enhanced by the strong modulation of the interaction along the Fermi line, leading to an energy scale for the onset of the pairing instability as large as 1 meV when the Fermi energy is sufficiently close to the EVHS.

引用

页数：4

共 32 条

[1]

ATTACCALITE C, ARXIV08080786, P1302

[2] Photoemission study of K on graphite [J].

Bennich, P ;

Puglia, C ;

Brühwiler, PA ;

Nilsson, A ;

Maxwell, AJ ;

Sandell, A ;

Mårtensson, N ;

Rudolf, P .

PHYSICAL REVIEW B, 1999, 59 (12) :8292-8304

[3] Quasiparticle dynamics in graphene [J].

Bostwick, Aaron ;

Ohta, Taisuke ;

Seyller, Thomas ;

Horn, Karsten ;

Rotenberg, Eli .

NATURE PHYSICS, 2007, 3 (01) :36-40

[4] Theoretical explanation of superconductivity in C6Ca -: art. no. 237002 [J].

Calandra, M ;

Mauri, F .

PHYSICAL REVIEW LETTERS, 2005, 95 (23)

[5] Electronic structure of heavily doped graphene: The role of foreign atom states [J].

Calandra, Matteo ;

Mauri, Francesco .

PHYSICAL REVIEW B, 2007, 76 (16)

[6] Electron-phonon coupling and electron self-energy in electron-doped graphene: Calculation of angular-resolved photoemission spectra [J].

Calandra, Matteo ;

Mauri, Francesco .

PHYSICAL REVIEW B, 2007, 76 (20)

[7] The role of the interlayer state in the electronic structure of superconducting graphite intercalated compounds [J].

Csányi, G ;

Littlewood, PB ;

Nevidomskyy, AH ;

Pickard, CJ ;

Simons, BD .

NATURE PHYSICS, 2005, 1 (01) :42-45

[8] Calcium d states:: Chemical bonding of CaC6 [J].

Deng, Shuiquan ;

Simon, Arndt ;

Koehler, Juergen .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2008, 47 (35) :6703-6706

[9] Heteroepitaxial graphite on 6H-SiC(0001):: Interface formation through conduction-band electronic structure [J].

Forbeaux, I ;

Themlin, JM ;

Debever, JM .

PHYSICAL REVIEW B, 1998, 58 (24) :16396-16406

[10] OBSERVATION OF AN EXTENDED VAN-HOVE SINGULARITY IN YBA2CU4O8 BY ULTRAHIGH-ENERGY RESOLUTION ANGLE-RESOLVED PHOTOEMISSION [J].

GOFRON, K ;

CAMPUZANO, JC ;

ABRIKOSOV, AA ;

LINDROOS, M ;

BANSIL, A ;

DING, H ;

KOELLING, D ;

DABROWSKI, B .

PHYSICAL REVIEW LETTERS, 1994, 73 (24) :3302-3305

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