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DESCRIPTION:Dr. Winfried Teizer\, University of California at San Diego\n\n
In the quantum critical regime\, Coulomb interactions modify the de
nsity of states at the Fermi level and ultimately open a soft Coulomb gap
since the decreasing electron mobility inhibits efficient screening. I wil
l present tunneling spectroscopy data on amorphous GdxSi1<
/sub>-x\, a material that can be continuo
usly and reversibly tuned through the metal-insulator transition. On the m
etallic side\, we find a signature of strong Coulomb interactions in the d
ensity of states\, as theoretically expected. As the metal-insulator trans
ition 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 re
gime.
DTSTART:20010222T210000Z
LOCATION:Physics Building\, Room 204
SUMMARY:The Density of States in the Quantum Critical Regime of the Metal-I
nsulator Transition
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