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Condensed Matter Seminars

ics Condensed Matter
Thursday, February 22, 2001
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Dr. Winfried Teizer [Host: J. Poon]
University of California at San Diego
"The Density of States in the Quantum Critical Regime of the Metal-Insulator Transition"
ABSTRACT:
In the quantum critical regime, Coulomb interactions modify the density of states at the Fermi level and ultimately open a soft Coulomb gap since the decreasing electron mobility inhibits efficient screening. I will present tunneling spectroscopy data on amorphous GdxSi1-x, a material that can be continuously and reversibly tuned through the metal-insulator transition. On the metallic side, we find a signature of strong Coulomb interactions in the density of states, as theoretically expected. As the metal-insulator transition is approached from the metallic side, the tunneling spectrum shows a precursor of a soft Coulomb gap prior to reaching the insulating regime. I will extract the quantitative relationship of the density of states at the Fermi energy and the transport conductivity in the quantum critical regime.

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