Anomalous growth of thermoelectric power in gapped graphene

被引：42

作者：

Sharapov, S. G. ^{[1
,2
]}

Varlamov, A. A. ^{[2
,3
]}

机构：

[1] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, UA-03680 Kiev, Ukraine

[2] Mediterranean Inst Fundamental Phys, Rome, Italy

[3] Univ Roma Tor Vergata, CNR SPIN, I-00133 Rome, Italy

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 03期

关键词：

D O I：

10.1103/PhysRevB.86.035430

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

There exist experiments indicating that at certain conditions, such as an appropriate substrate, a gap of the order of 10 meV can be opened at the Dirac points of a quasiparticle spectrum of graphene. We demonstrate that the opening of such a gap can result in the appearance of a fingerprint bump of the Seebeck signal when the chemical potential approaches the gap edge. The magnitude of the bump can be up to one order higher than the already large value of the thermopower occurring in graphene. Such a giant effect, accompanied by the nonmonotonous dependence on the chemical potential, is related to the emergence of a new channel of quasiparticle scattering from impurities with the relaxation time strongly dependent on the energy. We analyze the behavior of conductivity and thermopower in such a system, accounting for quasiparticle scattering from impurities with the model potential in a self-consistent scheme. Reproducing the existing results for the case of gapless graphene, we demonstrate a failure of the simple Mott formula in the case under consideration.

引用

页数：5

共 23 条

[21] Magnetoresistance Measurements of Graphene at the Charge Neutrality Point [J].

Zhao, Yue ;

Cadden-Zimansky, Paul ;

Ghahari, Fereshte ;

Kim, Philip .

PHYSICAL REVIEW LETTERS, 2012, 108 (10)

[22] Substrate-induced bandgap opening in epitaxial graphene [J].

Zhou, S. Y. ;

Gweon, G.-H. ;

Fedorov, A. V. ;

First, P. N. ;

De Heer, W. A. ;

Lee, D.-H. ;

Guinea, F. ;

Castro Neto, A. H. ;

Lanzara, A. .

NATURE MATERIALS, 2007, 6 (10) :770-775

[23] Thermoelectric and Magnetothermoelectric Transport Measurements of Graphene [J].

Zuev, Yuri M. ;

Chang, Willy ;

Kim, Philip .

PHYSICAL REVIEW LETTERS, 2009, 102 (09)

← 1 2 3 →