Laboratory of Condensed Matter Physics, University of Picardie Jules Verne, Amiens, France.
Phys Rev Lett. 2011 Jul 1;107(1):016601. doi: 10.1103/PhysRevLett.107.016601. Epub 2011 Jun 29.
We consider the Nernst-Ettingshausen (NE) effect in the presence of semiclassically strong magnetic fields for a quasi-two-dimensional system with a parabolic or linear dispersion of carriers. We show that the occurring giant oscillations of the NE coefficient are coherent with the recent experimental observation in graphene, graphite, and bismuth. In the 2D case we find the exact shape of these oscillations and show that their magnitude decreases (increases) with enhancement of the Fermi energy for Dirac fermions (normal carriers). With a crossover to the 3D spectrum the phase of the oscillations shifts, their amplitude decreases, and the peaks become asymmetric.
我们研究了在半经典强磁场存在下，具有抛物型或线性载流子色散的准二维系统中的能斯特-埃廷豪森（Nernst-Ettingshausen，NE）效应。我们表明，所发生的 NE 系数的巨大振荡与最近在石墨烯、石墨和铋中的实验观测一致。在 2D 情况下，我们找到了这些振荡的确切形状，并表明它们的幅度随着狄拉克费米子（正常载流子）的费米能的增强而减小（增大）。随着向 3D 谱的转变，振荡的相位发生了偏移，幅度减小，并且峰值变得不对称。
