Behnia Kamran, Méasson Marie-Aude, Kopelevich Yakov
Laboratoire de Physique Quantique (CNRS), ESPCI, 10 Rue de Vauquelin, 75231 Paris, France.
Phys Rev Lett. 2007 Apr 20;98(16):166602. doi: 10.1103/PhysRevLett.98.166602.
In elemental bismuth, 10(5) atoms share a single itinerant electron. Therefore, a moderate magnetic field can confine electrons to the lowest Landau level. We report on the first study of metallic thermoelectricity in this regime. The main thermoelectric response is off-diagonal with an oscillating component several times larger than the nonoscillating background. When the first Landau level attains the Fermi energy, both the Nernst and the Ettingshausen coefficients sharply peak, and the latter attains a temperature-independent maximum. These features are yet to be understood. We note a qualitative agreement with a theory invoking current-carrying edge excitations.
在元素铋中，10⁵个原子共享一个巡游电子。因此，适度的磁场可将电子限制在最低朗道能级。我们报告了对该体系中金属热电性的首次研究。主要热电响应是对角外的，其振荡分量比非振荡背景大几倍。当第一朗道能级达到费米能量时，能斯特系数和埃廷斯豪森系数都急剧峰值，且后者达到一个与温度无关的最大值。这些特征尚待理解。我们注意到与一种援引载流边缘激发的理论存在定性上的一致性。
