Gapless spin-1 neutral collective mode branch for graphite

被引：58

作者：

Baskaran, G ^{[1
]}

Jafari, SA

机构：

[1] Inst Math Sci, Madras 600113, Tamil Nadu, India

[2] Sharif Univ Technol, Dept Phys, Tehran, Iran

[3] Abdus Salam ICTP, I-34100 Trieste, Italy

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.89.016402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the standard tight binding model of 2D graphite with short range electron repulsion, we predict a gapless spin-1, neutral collective mode branch below the particle-hole continuum with energy vanishing linearly with momenta at the Gamma and K points in the Brillouin zone. This spin-1 mode has a wide energy dispersion, 0 to similar to2 eV , and is not Landau damped. The "Dirac cone spectrum" of electrons at the chemical potential of graphite generates our collective mode, so we call this "spin-1 zero sound" of the "Dirac sea." Epithermal neutron scattering experiments and spin polarized electron energy loss spectroscopy can be used to confirm and study our collective mode.

引用

页数：4

共 27 条

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