Magneto-plasmons in a grating-coupled modulated 2DEG

Bangert, D.E.; Stuart, R. J.; Tyson, R.; Hughes, H. P.

doi:10.1006/spmi.1993.1044

Cited by 3 publications

(2 citation statements)

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“…There is a large diversity of theoretical treatments for the optical response of an electron gas in reduced dimensionality, ranging from classical hydrodynamic to quantum manybody approaches. Many of these approaches have been used to investigate the limiting cases of a weakly modulated 2DEG [71][72][73][74][75] or of a 1DEG with a few occupied subbands. [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92] Some of these theoretical treatments also address the problem of the description of a modulated 2DEG with an arbitrary amplitude of the modulation ͑i.e., from the 2D to the 1D limit͒.…”

Section: Introductionmentioning

confidence: 99%

Electrical transport and far-infrared transmission in a quantum wire array

Lefebvre

Beerens

Feng

et al. 1998

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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A wide set of data obtained on a two-dimensional electron gas submitted to a tunable lateral modulation, induced using a split-gate technique, is presented. Owing to a unique design of the sample, it has been possible to combine in a single experimental run, far-infrared transmission measurements and electrical transport measurements in both directions parallel and perpendicular to the lateral modulation. The discussion of the results emphasizes the correspondence between various features observed in both types of measurements. Based on these features, three regimes of modulation are clearly identified, namely the weak, intermediate and strong modulation regimes. Far-infrared transmission data show that each of these regimes is characterized by plasmon modes with a distinctive behavior. These behaviors are analyzed further with the use of transport data, which allow to determine the electron concentration in the structure for every condition of gate voltage. In the weak modulation regime, a quantitative analysis shows that the collective mode energy is consistent with that of a classical 2D plasmon at q=2π/a (where a is the period of the split gate), using the average electron concentration under the gate as the relevant parameter. In the intermediate regime, the collective modes are confined plasmons. The observation of “confined Bernstein modes” indicates that the bare confinement potential is nonparabolic in this regime. In the strong modulation regime, the observation of a far-infrared resonance energy which does not depend on the modulation amplitude, while the effective 2D electron concentration (within each wire) varies with gate voltage, shows that the collective mode is a Kohn mode.

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Section: Introductionmentioning

confidence: 99%

Electrical transport and far-infrared transmission in a quantum wire array

Lefebvre

Beerens

Feng

et al. 1998

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

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“…Theoretically, it has been shown that an increase in the modulation strength causes a decrease in the plasmon mode energy, even when the average electron concentration is kept constant in the calculations. 15,16 This effect can be expected to affect Bernstein modes energy as well. However, to our knowledge such a calculation of Bernstein modes in the weak modulation regime has not been reported.…”

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confidence: 95%

Far-infrared transmission study of Bernstein modes in a two-dimensional electron gas with a tunable lateral modulation

Lefebvre

Beerens

Feng

et al. 1998

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Magnetoplasmon excitations in an array of periodically modulated quantum wires

Zyl

Zaremba

2001

Phys. Rev. B

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Motivated by the recent experiment of Hochgräfe et al., we have investigated the magnetoplasmon excitations in a periodic array of quantum wires with a periodic modulation along the wire direction. The equilibrium and dynamic properties of the system are treated self-consistently within the Thomas-Fermi-Dirac-von Weizsäcker approximation. A calculation of the dynamical response of the system to a far-infrared radiation field reveals a resonant anticrossing between the Kohn mode and a finite-wavevector longitudinal excitation which is induced by the density modulation along the wires. Our theoretical calculations are found to be in excellent agreement with experiment. 73.20.Mf, 73.20.Dx Typeset using REVT E X 1 7

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Magneto-plasmons in a grating-coupled modulated 2DEG

Cited by 3 publications

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Electrical transport and far-infrared transmission in a quantum wire array

Electrical transport and far-infrared transmission in a quantum wire array

Far-infrared transmission study of Bernstein modes in a two-dimensional electron gas with a tunable lateral modulation

Magnetoplasmon excitations in an array of periodically modulated quantum wires

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