All electrical measurement of the density of states in (Ga,Mn)As
D. Neumaier, M. Turek, U. Wurstbauer, A. Vogl, M. Utz, W. Wegscheider,, and D. Weiss
TL;DR
This paper presents electrical measurement techniques to determine the effective density of states at the Fermi energy in ferromagnetic (Ga,Mn)As, providing insights into its electronic properties through conductivity and diffusion analysis.
Contribution
It introduces a method to extract the density of states in (Ga,Mn)As using electrical conductivity corrections and the Einstein relation, advancing understanding of its electronic structure.
Findings
Effective density of states at the Fermi energy was successfully measured.
Electrical diffusion constants were obtained for different dimensionalities.
The method enhances the characterization of ferromagnetic semiconductors.
Abstract
We report on electrical measurements of the effective density of states in the ferromagnetic semiconductor material (Ga,Mn)As. By analyzing the conductivity correction due to enhanced electron-electron interaction the electrical diffusion constant was extracted for (Ga,Mn)As samples of different dimensionality. Using the Einstein relation allows to deduce the effective density of states of (Ga,Mn)As at the Fermi energy.
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