University of Minnesota
School of Physics & Astronomy

Condensed Matter Sack Lunch Seminar

Friday, September 15th 2017
12:20 pm:
Speaker:  Michael Sammon, University of Minnesota
Subject:  Anomalous Thermodynamic Properties of Electron Accumulation Layer in SrTiO3

Due to the nonlinear dielectric response within SrTiO3 (STO),
an accumulation layer created by positive charges at the surface of the STO sample (x = 0) has an electron density pro file n(x) that slowly decays as 1=x^{12/7}. Previous works have shown that the slow decay of the tail leads to a divergence of kinetic coefficients when the scattering is primarily at the surface. Here we extend that work to the thermodynamic properties of the layer, and show that a similar divergence occurs in the magnetization and the specific heat when averaged over the accumulation layer. I will discuss several ways in
which the averaging may be truncated. The second half of the talk will focus on the capacitance as a function of the back gate voltage and explain how it can be used as an experimental tool for studying the tail of the distribution.

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