Dirac fermions at the H point of graphite:: Magnetotransmission studies

被引：70

作者：

Orlita, M. ^{[1
,2
,3
]}

Faugeras, C. ^{[1
]}

Martinez, G. ^{[1
]}

Maude, D. K. ^{[1
]}

Sadowski, M. L. ^{[1
]}

Potemski, M. ^{[1
]}

机构：

[1] CNRS, Grenoble High Magnet Field Lab, F-38025 Grenoble 09, France

[2] Charles Univ Prague, Inst Phys, CZ-12116 Prague 2, Czech Republic

[3] ASCR, Inst Phys, CZ-16253 Prague 6, Czech Republic

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.100.136403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on far infrared magnetotransmission measurements on a thin graphite sample prepared by exfoliation of highly oriented pyrolytic graphite. In a magnetic field, absorption lines exhibiting a blueshift proportional to root B are observed. This is a fingerprint for massless Dirac holes at the H point in bulk graphite. The Fermi velocity is found to be (c) over tilde = (1.02 +/- 0.02) x 10(6) m/s and the pseudogap vertical bar Delta vertical bar at the H point is estimated to be below 10 meV. Although the holes behave to a first approximation as a strictly 2D gas of Dirac fermions, the full 3D band structure has to be taken into account to explain all the observed spectral features.

引用

页数：4

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