Intersubband resonances in quasi-one-dimensional channels

Kotthaus, J. P.; Hansen, W.; Pöhlmann, H; Wassermeier, M.

doi:10.1016/0039-6028(88)90748-0

Cited by 29 publications

(4 citation statements)

References 16 publications

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“…These plasmons were found to be split into two modes In MOS structures in which the oxide thickness has o,(q,,) reflecting the effect of the periodic density been periodically modulated with sub-micrometre modulation on the plasmon dispersion. This is shown period b , Mackens et nl (1984) system had been predicted by Krasheninnikov and Chaplik (1981) in a perturbation theory model. Assuming that the modulation amplitude of the static density modulation is small compared with the average density N, and that w/q@uF (Fermi velocity) they predict a splitting at q,, = n(;r/b) of…”

mentioning

confidence: 68%

Characterisation of the charge density modulation in periodic MOS structures by plasmon spectroscopy

Zettler¹,

Kotthaus²

1988

Semicond. Sci. Technol.

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In electron inversion layers on (100) Si MOS structures with laterally periodic oxide modulation plasmons are investigated with far-infrared transmission experiments. In such structures an applied gate voltage causes a static inversion charge density modulation which in turn gives rise to mini-gaps in the plasmon dispersion relation. Here we investigate the lowest mini-gap at plasmon wavevectors near the zone boundary of the first mini-zone induced by the periodic charge density modulation. The experimental results are compared with perturbation theory. MOS structules on Si have been extensivelyused to study the unique electronic properties of twodimensional inversion layers (for a review see. e.g.

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confidence: 68%

Characterisation of the charge density modulation in periodic MOS structures by plasmon spectroscopy

Zettler¹,

Kotthaus²

1988

Semicond. Sci. Technol.

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“…The electron transport is diffusive but, due to the fact that the elastic scattering centres (impurities) are away from the electron gas, a very high mobility is obtained. For low electron densities the renormalized confining potential in the direction normal to the interfaces, originated by the modulated voltage, can be approximated by a harmonic potential [12][13][14][15]. In the present work we are interested in the non-linear transport of such a quantum wire under the action of an applied magnetic field perpendicular to the interfaces.…”

Section: Introductionmentioning

confidence: 99%

Emission and absorption of confined and interface optical phonons by electrons in the non-linear transport regime of a parabolic quantum wire

Wang

Lima

Lei

1998

J. Phys.: Condens. Matter

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We present a detailed study of dissipation by electrons in the non-linear transport regime of harmonically confined quantum wires in GaAs/AlAs structures through emission and absorption of confined and interface optical phonons. An applied magnetic field perpendicular to the interfaces is used to modulate the natural harmonic frequencies in order to explore situations in and off resonance with the vibrational modes. Our results show that electrons absorb both confined phonons and interface phonons over wide angles and backwards, at low drift velocities. The emission occurs both forwards and backwards and dominates entirely for high drift velocities. The confined phonons play the dominant role in the dissipation, even for quantum wires inside thin quantum wells and with a magnetic field strength selected to make the harmonic levels in resonance with the AlAs-like interface mode.

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“…The potential relief in the plane of the ZD electron channel in MOS devices or heterostructures is produced by a specially shaped electrode or by photoionized impurities. The present work was stimulated by far infrared absorption (FIR) experiments [4,5], in which the zero-wave vector odd modes of plasma oscillations with non-zero spatially averaged current density are observed. The dependence of resonant frequencies on the averaged areal density E in the device was investigated, and the most specific feature was found in a sharp frequency drop at some value of E. This value did not depend on the transverse magnetic field also present in the experiment and was considered to be the critical concentration, below which the redistribution of electron density fails to screen the external potential completely and the modulated continuous charge distribution is transformed into a periodic array of isolated stripes.…”

Section: Introductionmentioning

confidence: 99%

Screening and oscillations in a spatially modulated 2D electron gas

Meshkov¹

1991

J. Phys.: Condens. Matter

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Thescreeningofaone-dimensionalpotentialreliefbya2~elenrongasandplasmaoscillations is investigated for the case of cosine-like extemal potentials. "he analytical solution of the screening problem provides an opportunity for the development of qualified numerical procedures for linear oscillations within the framework of the hydrodynamical model. A simple analytical expression is obtained for the frequency of a zero-wave vector plasmon as a function of electron concentration and potential amplitude. A strong frequency drop at the critical point of concentration between linear and nan-linear screening regimes, which was observed experimentally, is explained. In the vicinity of the critical concentration the asymptotical expressions are derived, which hold for any smooth periodical potential.

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Intersubband resonances in quasi-one-dimensional channels

Cited by 29 publications

References 16 publications

Characterisation of the charge density modulation in periodic MOS structures by plasmon spectroscopy

Characterisation of the charge density modulation in periodic MOS structures by plasmon spectroscopy

Emission and absorption of confined and interface optical phonons by electrons in the non-linear transport regime of a parabolic quantum wire

Screening and oscillations in a spatially modulated 2D electron gas

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