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Accueil > Séminaires > Séminaires passés > Seminaires de 2013 > Denis Konstantinov (Okinawa Institute of Science and Technology)

Microwave-induced vanishing of magnetoconductance in classical electrons on liquid helium

Denis Konstantinov (Okinawa Institute of Science and Technology)

Lundi 6 Mai 14h salle de réunion Bat.108 1er étage

Two-dimensional electron system formed on the surface of liquid helium
present a unique classical counterpart to quantum Hall systems in
semiconductors. First, this is a low-density system with the large ratio of the potential energy of electron-electron interaction to the electron
kinetic energy. Therefore, even at T=0 electrons on helium comprise a
strongly-correlated classical system rather than degenerate Fermi gas
typical for electrons in semiconductors. Second, this system is completely free of impurities, with the electron mobility limited only by their interaction with surface vibrations. For these reasons, the study of electron transport in this system presents an important complement for similar studies in semiconductors.

Recently, we demonstrated an effect of vanishing dissipative conductivity occurring in 2D electrons on liquid helium [1]. When exposed to resonant millimeter microwaves, which excite transitions of electrons between two lowest 2D subbands, the system exhibits inter-subband quantum oscillations of magnetoconductance [2]. The oscillations originate from the scattering-mediated transitions of the excited electrons between the Landau levels of the occupied subbands. At sufficiently low temperatures and high radiation intensities, the diagonal conductivity drops to zero at the minima
of the oscillations. The effect is reminiscent of radiation-induced
zero-resistance states observed recently in GaAs/AlGaAs heterostructures [3] and is accompanied by strongly nonequilibrium spatial distribution of electrons [4]. The latter could be a sign of domains carrying non-dissipative current.

[1] Konstantinov and Kono, Phys. Rev. Lett. 105, 226801 (2010).
[2] Konstantinov and Kono, Phys. Rev. Lett. 103, 266808 (2009).
[3] Mani et al. Nature (London) 420, 646 (2002).
[4] Konstantinov et al., J. Phys. Soc. Jpn. 81, 093601 (2012).