Energy Gaps of Elemental Semiconductors Composed of "Infinitely" Massive Isotopes
Friday November 30, 2007
Refreshments are served at 3:00 p.m. in Physics room 242.
Prof. Anant K. Ramdas
Purdue University
The talk will focus on the renormalization effects of the band gaps in the electronic band structure of the elemental semiconductors traced to zero-point vibrations. Electron-phonon interaction and volume changes (in combination with anharmonicity) are the underlying microscopic mechanisms. Isotopically controlled crystals offer an extraordinary opportunity to test the theoretical predictions with a variety of spectroscopic techniques. Illustrative examples on Si and Ge, drawn from our investigations are presented
