Thermal Conductivity and Thermopower near the 2D Metal-Insulator transition, Final Technical Report

SARACHIK, MYRIAM P

关键词: two-dimensional materials;    thermopower;    electron interactions;    metal-insulator transition;   

DOI  :  10.2172/1170416
RP-ID  :  DOE-CCNY-45153
PID  :  OSTI ID: 1170416

学科分类：凝聚态物理

美国|英语

来源: SciTech Connect

【 摘 要 】

STUDIES OF STRONGLY-INTERACTING 2D ELECTRON SYSTEMS ??? There is a great deal of current interest in the properties of systems in which the interaction between electrons (their potential energy) is large compared to their kinetic energy. We have investigated an apparent, unexpected metal-insulator transition inferred from the behavior of the temperature-dependence of the resistivity; moreover, detailed analysis of the behavior of the magnetoresistance suggests that the electrons??? effective mass diverges, supporting this scenario. Whether this is a true phase transition or crossover behavior has been strenuously debated over the past 20 years. Our measurements have now shown that the thermoelectric power of these 2D materials diverges at a finite density, providing clear evidence that this is, in fact, a phase transition to a new low-density phase which may be a precursor or a direct transition to the long sought-after electronic crystal predicted by Eugene Wigner in 1934.