Condensed Matter Physics Seminar

Prof. Hyunsik Im, Dongguk University, Seoul, Korea

Friday 20 February 2015, 1500-1600
C1 Physics Building

Doping in semiconductors and quantum phase transitions

Semiconductors are materials that possess the unique ability to extensively control their electronic nature by adding impurities, and this makes them valuable in applications. How the interplay between disorder and electron-electron interactions affects the electronic phase transition of solids has remained a challenging issue over many years. Here we perform high-precision tunneling DOS spectroscopy measurements in P-doped Si in the quasi-degenerate metallic region. We report on the observation of a new magnetic field-driven quantum phase transition between a magnetic insulator and a paramagnetic disordered Fermi liquid.