Trushin Maxim, Schliemann John
Institute for Theoretical Physics, University of Regensburg, D-93040 Regensburg, Germany.
Phys Rev Lett. 2007 Nov 23;99(21):216602. doi: 10.1103/PhysRevLett.99.216602. Epub 2007 Nov 21.
We investigate the minimum conductivity of graphene within a quasiclassical approach taking into account electron-hole coherence effects which stem from the chiral nature of low energy excitations. Relying on an analytical solution of the kinetic equation in the electron-hole coherent and incoherent cases, we study both the electrical and the thermal conductivity whose relation satisfies the Wiedemann-Franz law. We find that most of the previous findings based on the Boltzmann equation are restricted to only high mobility samples where electron-hole coherence effects are not sufficient.
我们采用准经典方法研究石墨烯的最小电导率，该方法考虑了源于低能激发的手征性质的电子-空穴相干效应。基于电子-空穴相干和非相干情况下动力学方程的解析解，我们研究了电导率和热导率，它们的关系满足维德曼-夫兰兹定律。我们发现，以前基于玻尔兹曼方程的大多数研究结果仅局限于高迁移率样品，而在这些样品中电子-空穴相干效应并不显著。
