Imaging of magnetoplasmons excited in a two-dimensional electron gas

Baskin, Ilya; Ashkinadze, B. M.; Cohen, E.; Pfeiffer, L. N.

doi:10.1103/physrevb.84.041305

Phys. Rev. B

2011

DOI: 10.1103/physrevb.84.041305

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Imaging of magnetoplasmons excited in a two-dimensional electron gas

Ilya Baskin

B. M. Ashkinadze

E. Cohen

et al.

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Cited by 8 publications

(8 citation statements)

References 25 publications

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“…Assuming a uniform electric field distribution, only odd modes are expected [32], consistent with some experiments [1,4]. Other experiments, however, revealed both odd and even low-order modes, with comparable, but often random, strengths [6,14,15]. While we have clearly observed different signal strengths for even and odd modes, their ratio can vary with the radiation frequency.…”

supporting

confidence: 89%

“…While some photoresistance measurements revealed either only the fundamental [1] or the lowest few odd-order MPR modes [4], another study [6] reported MPR modes with n = 1, 2, 3, 4. Higher order (n 10) MPR have been observed in microwave absorption [14] and spatially resolved photoluminescence [15] and, more recently, even higher modes have been detected in photovoltage [16,17] and differential luminescence spectra [18].…”

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confidence: 99%

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Resistively detected high-order magnetoplasmons in a high-quality two-dimensional electron gas

et al. 2016

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We report on high-order magnetoplasmon resonances detected in photoresistance in high-mobility GaAs quantum wells. These resonances manifest themselves as a series of photoresistance extrema in the regime of Shubnikov-de Haas oscillations. Extending to orders above 20, the extrema exhibit alternating strength, being less (more) pronounced at even (odd) order magnetoplasmon modes. This experimental technique provides sensitive and elegant means to detect and investigate multiple magnetoplasmon modes and could be applied to other systems.

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supporting

confidence: 89%

mentioning

confidence: 99%

Resistively detected high-order magnetoplasmons in a high-quality two-dimensional electron gas

et al. 2016

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“…Both can influence the screening of the lattice, affecting m*, and the screening of scatterers, as has been reported for low temperature grown GaAs [29,31]. Collective phenomena, however, cannot account for an increase of 30 times.…”

mentioning

confidence: 83%

“…Photogenerated electrons are scattered into all directions. In our simulations, momentum conservation is therefore not assumed.In principle, the large value of r eff could also point towards collective phenomena such as plasmons or charge density waves [29,30]. Both can influence the screening of the lattice, affecting m*, and the screening of scatterers, as has been reported for low temperature grown GaAs [29,31].…”

mentioning

confidence: 85%

“…In principle, the large value of r eff could also point towards collective phenomena such as plasmons or charge density waves [29,30]. Both can influence the screening of the lattice, affecting m*, and the screening of scatterers, as has been reported for low temperature grown GaAs [29,31]. Collective phenomena, however, cannot account for an increase of 30 times.…”

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confidence: 94%

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Enlarged magnetic focusing radius of photoinduced currents in mesoscopic circuits

et al. 2012

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We exploit GaAs-based quantum point contacts as mesoscopic detectors to analyze the ballistic flow of photogenerated electrons in a two-dimensional electron gas at a perpendicular magnetic field. Whereas charge transport experiments always measure the classical cyclotron radius, we show that this changes dramatically when detecting the photoinduced non-equilibrium current in magnetic fields. The experimentally determined radius of the trajectories surprisingly exceeds the classical cyclotron value by far. Monte Carlo simulations suggest electron-electron scattering as the underlying reason. PACS: 73.23.Ad, 42.82.Fv, 81.07.St, 85.35.Be, 72.20.Dp KEYWORDS. Ballistic optoelectronic quantum transport, nanoscale optoelectronics, nonequilibrium transport, electron-electron scattering 2In the presence of a magnetic field B, propagating charge carriers obey the Lorenz force and move on curved trajectories in the plane perpendicular to the field. The corresponding classical cyclotron radius r cyclo (| |) = |v| | |(1) for a charge q is a measure of its momentum and thus contains both mass m and velocity v of the carrier. Based on Eq. 1, cyclotron resonance experiments on twodimensional electron systems have been used to verify the 2D nature, to determine the components of the effective mass tensor in solids and to obtain information on Fermi contours [1]. However, following Kohn's theorem, the mass measured in cyclotron resonance experiments is expected to be the bare mass, not affected by electron-electron interactions [2]. In magnetic focusing experiments, quantum point contacts (QPCs) have been used both as injectors and detectors to indirectly obtain information on cyclotron trajectories of ballistic currents in two-dimensional electron gases (2DEGs) [3,4,5,6]. At 2DEGs' boundaries, even skipping cyclotron orbits have been visualized using a scanning gate technique [7,8,9,10], and different electron trajectories have been shown to interfere with each other [8,11,12]. The trajectories extracted were in accordance with Eq. (1) and the expected effective mass GaAs * of the GaAs-based circuits.Here, we exploit an optical beam induced current (OBIC) technique to directly analyze the flowpatterns of photogenerated electrons in a 2DEG embedded in an AlGaAs/GaAs quantum well at a perpendicular magnetic field. In contrast to the magnetic focusing results gained from transport experiments, we uncover the magnetic focusing dynamics of photogenerated non-equilibrium excess charge carriers in a 2DEG. A laser locally creates charge carriers at a certain position in the 2DEG, and the ballistic photocurrent of the photogenerated electrons across an adjacent QPC is measured as a function of the laser position [13,14]. This OBIC-technique allows adjusting the excitation position independent of the applied |B|. Thus, it is possible to directly map the magnetic flow patterns of photogenerated electrons in the 2DEG. We observe curved trajectories with a radius being inversely proportional to |B| as expected from Eq. (1). However...

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Plasmon dispersions in high electron mobility terahertz detectors

Białek

Czapkiewicz

Wróbel

et al. 2014

Applied Physics Letters

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Low temperature, high magnetic field experiments were carried out with monochromatic terahertz (THz) sources to reveal multimode spectra of magnetoplasmons excited in gated and ungated samples processed on a high electron mobility GaAs/AlGaAs heterostructure. We show that playing with the geometry and thickness of the gate one can control both the plasmon dispersion relation and selection rules for plasmon excitation, giving a tool to a better control of plasmon resonances in THz detectors.

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Imaging of magnetoplasmons excited in a two-dimensional electron gas

Cited by 8 publications

References 25 publications

Resistively detected high-order magnetoplasmons in a high-quality two-dimensional electron gas

Resistively detected high-order magnetoplasmons in a high-quality two-dimensional electron gas

Enlarged magnetic focusing radius of photoinduced currents in mesoscopic circuits

Plasmon dispersions in high electron mobility terahertz detectors

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