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Phys Rev Lett. 2000 Jan 24;84(4):729-32.

Landau-level spectroscopy of a two-dimensional electron system by tunneling through a quantum dot.

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  • 1School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom.


A single InAs self-assembled quantum dot is incorporated in the barrier of a tunnel diode and used as a spectroscopic probe of an adjacent two-dimensional electron system from the Fermi energy to the subband edge. We obtain quantitative information about the energy dependence of the quasiparticle lifetime. For magnetic field B, applied parallel to the current, we observe peaks in the current-voltage characteristics I(V) corresponding to the formation of Landau levels. Close to filling factor nu=1 we observe directly the exchange enhancement of the Lande g factor.

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