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All-electrical measurement of the density of states in (Ga,Mn)As

: Neumaier, D.; Turek, M.; Wurstbauer, U.; Vogl, A.; Utz, M.; Wegscheider, W.; Weiss, D.


Physical review letters 103 (2009), No.8, Art.087203, 4 pp.
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article
Fraunhofer CSP ()

We report on electrical measurements of the effective density of states in the ferromagnetic semiconductor material (Ga,Mn)As. By analyzing the conductivity correction to an enhanced electron-electron interaction the electrical diffusion constant was extracted for (Ga,Mn)As samples of different dimensionality. Using the Einstein relation allows us to deduce the effective density of states of (Ga,Mn)As at the Fermi energy.