[seminar] Seminar FO, Kadigrobov

[hbuljan at phy.hr]

Poštovani kolege,

podsjećam na današnji seminar Dr. A.M. Kadigrobova iz Bochuma.

Srdačan pozdrav
Hrvoje Buljan


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SEMINAR FIZIČKOG ODSJEKA
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Vrijeme:   utorak, 24. 10. 2006., 15:15 sati (točno)
Mjesto:    Fizički odsjek, Bijenička c. 32, predavaonica F08

   NEW QUANTUM INTERFERENCE EFFECTS IN TRANSPORT
         PROPERTIES OF 2D ELECTRON GAS

               Dr. A.M. Kadigrobov
     Theoretische Physik III, Ruhr-Universität Bochum,
                 Bochum, Germany

Transport in a two dimensional (2D) electron gas subject to an
external magnetic field is analysed in the presence of a longitudinal
barrier. We show that quantum interference of the edge states bound by the
longitudinal barrier results in a drastic change of the electron dynamics:
the degenerated discrete Landau levels are transformed into an alternating
sequence of energy bands and energy gaps, the distribution of which being
quasi-chaotic. As this dynamics is based on the quantum interference,
thermodynamic and transport properties of the 2D electron gas turned out
to be extremely sensitive to external fields. In
particular, we predict giant oscillations of the ballistic conductance
with a change of magnetic field or the gate voltage, coherent Bloch
oscillations and non-linear current-voltage characteristics under a
relatively weak electric bias voltage.


				Voditelj seminara FO
				Hrvoje Buljan, hbuljan at phy.hr


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