LPEM (UPMC-CNRS), Ecole Supérieure de Physique et de Chimie Industrielles, Paris, France.
Phys Rev Lett. 2011 Jun 17;106(24):246405. doi: 10.1103/PhysRevLett.106.246405.
We report on a study of the Nernst effect in graphite extended up to 45 T. The Nernst response sharply peaks when a Landau tube is squeezed inside the thermally fuzzy Fermi surface and presents a temperature-independent fixed point when the tube flattens to a single ring. Beyond the quantum limit, the onset of the field-induced phase transition leads to a drastic drop in the Nernst response signaling the sudden vanishing of Landau tubes. The magnitude of this drop suggests the destruction of multiple Landau tubes possibly as a result of simultaneous nesting of the electron and hole pockets.
我们报告了一项关于石墨中能斯特效应的研究，该研究最高可达 45 特斯拉。当朗道管被挤压在热模糊费米面内时，能斯特响应急剧尖峰出现；而当管压扁成单个环时，能斯特响应呈现出与温度无关的固定点。在量子极限之外，场诱导相变的开始导致能斯特响应的急剧下降，表明朗道管的突然消失。这种下降的幅度表明可能由于电子和空穴口袋的同时嵌套，多个朗道管被破坏。
