Results 221 to 230 of about 93,066 (258)

The instability of 2D electron gas at high density

Surface Science, 1986
The edge-energy of a 2D electron gas with high density is calculated, where the edge-energy implies the energy which is needed to form a unit length of a new edge when a 2D infinite homogeneous electron sheet is cleft into two pieces of semi-infinite sheets. It is found that, when rs < 0.415, the edge-energy becomes negative.
Xin Sun, Han-kun Xie, Shi-xun Zhou
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Imaging the electron-phonon interaction in the 2D electron gas

Physica B: Condensed Matter, 1991
Abstract Ballistic phonon imaging techniques have been used to study the electron-photon interaction in the 2D electron gas (2DEG). Anisotropies in the phonon wavevector distribution arise out of the requirements for energy and momentum conservation when a phonon is emitted or absorbed and from the angular dependence of the electron-photon coupling ...
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Phonon-Emission Spectroscopy of a 2D-Electron Gas

Physica Scripta, 1989
A heated two-dimensional electron gas in a Si MOS structure (2d EG) emits phonons into the bulk substrate. At low temperatures (?1 K) and moderate electric fields (?10 V cm-1) these phonons are acoustical ones. We detected them using superconducting tunnel junctions and found that the phonon spectra had a remarkable cut-off whenever the phonon wave ...
W Dietsche, M Rothenfusser, L Köster
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Bosonization of a 2D electron gas in a magnetic field

Zeitschrift für Physik B Condensed Matter, 1996
Starting from a Landau level description of a 2D fermion gas subject to a perpendicular uniform magnetic field, under the condition that there is a large integer number of filled Landau levels, we introduce a bosonization scheme for the low energy excitations of the system. We give an explicit construction of the fermion operator in terms of the bosons
H. Westfahl, A.H. Castro Neto, A.O. Caldeira   +2 more
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Ultrafast Coherent Electron Spin Flip in a 2D Electron Gas

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009
Spin flip in a 2D electron gas is realized with a 2 ps, off-resonant laser pulse. Complete spin flip leads to spin precessions that are symmetric with respect to the arrival time of the π-pulse.
Carey Phelps, Timothy Sweeney, Hailin Wang   +2 more
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Magnetic-field dependence of the electron–LO-phonon interaction in a 2D electron gas

Europhysics Letters (EPL), 1998
The intensities of the circularly polarized luminescence of the radiative recombination between two-dimensional electrons and bound holes and of its longitudinal optic (LO) phonon low-energy sideband have been investigated at low temperatures of about 100 mK as a function of the magnetic field.
Hartmann, C., Martinez, G., Fischer, A., Braun, W., Ploog, K.   +4 more
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Magnetization and incompressibility of a high mobility 2D electron gas in the IQHE

Physica B: Condensed Matter, 1998
We have measured the magnetization of a single layer, high mobility 2D electron gas in the quantum limit. Sharp diamagnetic jumps in the magnetization are observed when an integer number of Landau levels is filled. We relate these jumps to incompressibility gaps in the energy spectrum of the order of the cyclotron energy, in which a small fraction of ...
Wiegers, S., Specht, M., Lévy, L., Simmons, M., Ritchie, D., Cavanna, A., Etienne, B., Martinez, G., Wyder, P.   +8 more
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Spin Stripes of the 2D Electron Gas in a Periodic Hyperfine Field

Nano Letters, 2004
A novel periodic spin structure induced in a two-dimensional electron gas by a periodic hyperfine field is proposed and theoretically studied. The periodic nuclear magnetization is created, via the hyperfine electron−nuclear spin interaction, by the light induced periodic electron spin grating.
Lembrikov, B., Malits, P., Haridim, M., Vagner, I.   +3 more
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Inter-subband scattering in a 2D electron gas

Semiconductor Science and Technology, 1990
A new technique, using the absolute amplitude of the low-field Shubnikov-de Haas oscillations, is presented which allows the direct measurement of inter-subband scattering in 2D heterojunction structures. When applied to a heterojunction with two subbands occupied the technique is used to show that inter-subband scattering is independent of temperature
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Metal-Insulator Transition in a 2D Electron Gas

2001
Physical Review ...
Klapwijk, T. M., Kravchenko, S. V., Shashkin, A. A.   +2 more
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