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Tunneling polaron effects and density of states at Fermi level of two-dimensional electron system


I. N. Kotel'nikov 1,2, S.E. Dizhur 1, N.A. Mordovets 1

1 Kotelínikov Institute of Radio-engineering and Electronics of RAS, Moscow, Russia

2International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland


The paper is received on December 25, 2014


Abstract: We investigated the tunneling structure Al/δ-GaAs with a strong disorder in two-dimensional electron system of the δ-layer. In some structures due to the diamagnetic shift of the levels we archived changing of the shape of the phonon lines and conditions close to the resonant polaron state. It is shown that in the latter case, this can lead to a nonmonotonic dependence of the tunneling density of states at the Fermi level on the magnetic field.

Key words: tunneling spectroscopy, two-dimensional electron systems, tunneling density of states.