Microwave response of a two-dimensional electron stripe

Mikhaǐlov, S. A.; Savostianova, N. A.

doi:10.1103/physrevb.71.035320

Cited by 95 publications

(77 citation statements)

References 28 publications

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“…54,55 According to Ref. 55, the importance of retardation can be described by the ratio of the plasmon frequency to the frequency of light with the same wavevector, α = e 2 n e w/2πε 0 m ⋆ c 2 . In our Hall bar, we estimate α ≃ 0.15 and thus do not expect significant modification of the MPR dispersion.…”

Section: -41mentioning

confidence: 99%

Magnetoplasmon resonance in a two-dimensional electron system driven into a zero-resistance state

et al. 2012

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We report on a remarkably strong, and a rather sharp, photoresistance peak originating from a dimensional magnetoplasmon resonance (MPR) in a high mobility GaAs/AlGaAs quantum well driven by microwave radiation into a zero-resistance state (ZRS). The analysis of the MPR signal reveals a negative background, providing experimental evidence for the concept of absolute negative resistance associated with the ZRS. When the system is further subject to a dc field, the maxima of microwave-induced resistance oscillations decay away and the system reveals a state with close-to-zero differential resistance. The MPR peak, on the other hand, remains essentially unchanged, indicating surprisingly robust Ohmic behavior under the MPR conditions.

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Section: -41mentioning

confidence: 99%

Magnetoplasmon resonance in a two-dimensional electron system driven into a zero-resistance state

et al. 2012

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“…The large retardation parameter indicates hybridization between the plasmon and photon modes. This leads to more pronounced manifestation of higher magnetoplasma harmonics, together with a reduced slope of the magnetodispersion curves that cross the cyclotron line [29][30][31]. As we will see later, this property contributes to the CR fine structure resolution.…”

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confidence: 91%

Fine structure of cyclotron resonance in a two-dimensional electron system

et al. 2016

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It is established that cyclotron resonance (CR) in a high-quality GaAs/AlGaAs two-dimensional electron system (2DES) originates as a pure resonance, that does not hybridize with dimensional magnetoplasma excitations. The magnetoplasma resonances form a fine structure of the CR. The observed fine structure of the CR results from the interplay between coherent radiative and incoherent collisional mechanisms of 2D plasma relaxation. We show that the range of 2DES filling factors from which the phenomenon arises is intimately connected to the fundamental fine-structure constant.Cyclotron resonance (CR) spectroscopy is the most direct and convenient method of characterizing the Fermi surface and determining the effective mass of semiconductors [1][2][3]. In a two-dimensional electron system (2DES), a perpendicular magnetic field quenches the inplane motion of electrons into cyclotron orbits. In turn, if the phase and polarization of the incident electromagnetic radiation are synchronized with the electron orbital motion, CR is triggered. The first observation of CR in 2DESs was reported for charged carriers in an inversion layer on Si [4, 5]. Subsequently, CR spectroscopy has been successfully applied to research on many two-dimensional systems, for example, isotropic 2D carriers in GaAs heterostructures [6][7][8], composite fermions [9], heavy fermions in MgZnO/ZnO heterojunctions [10,11], and anisotropic heavy fermions in AlAs quantum wells [12,13].It is widely believed that the cyclotron resonance originates from the dimensional magnetoplasma resonance [15,16,20]. The frequency of the hybrid cyclotron magnetoplasma mode is described by the equationwhere ω c = eB/m * c is the cyclotron frequency, and ω p is the dimensional plasmon frequency [17] (Gaussian units are used in this Letter unless otherwise stated):Here, n s and m * are the density and the effective mass of the 2D electrons, and ε is the effective permittivity of the surrounding medium. For a narrow 2DES stripe of width W , the plasmon wavevector can be approximately described by q = πN/W (N = 1, 2, . . . is the number of the plasmon harmonic).Contrary to general believe, we discovered that the CR originates as a pure resonance, that does not hybridize with dimensional magnetoplasma excitations. The CR rises as a single peak with superimposed contribution from different dimensional magnetoplasma modes. Therefore, initially the CR line shape exhibits a multipeak structure. We show that the CR fine structure is resolved when the coherent radiative 2D plasma relaxation dominates the incoherent collisional damping. In large samples, this regime appears when the 2D conductivity 2πσ xx is much larger than c. Moreover, the range of 2DES filling factors ν in which the CR fine structure necessarily arises is dictated by the relation 2πσ xy > c. The latter can be rewritten very elegantly as ν > 1/α, where α = e 2 / c ≈ 1/137 is the fundamental fine-structure constant.Experiments were performed on a set of high-quality GaAs/AlGaAs single quantum wells with a well w...

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“…. ) [24,49,82]. The most prominent resonance corresponds to the fundamental plasmon mode, while the higherorder resonances become increasingly weaker.…”

Section: A Signatures Of Graphene Plasmon Resonancesmentioning

confidence: 99%

Modeling the excitation of graphene plasmons in periodic grids of graphene ribbons: An analytical approach

et al. 2016

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We study electromagnetic scattering and subsequent plasmonic excitations in periodic grids of graphene ribbons. To address this problem, we develop an analytical method to describe the plasmon-assisted absorption of electromagnetic radiation by a periodic structure of graphene ribbons forming a diffraction grating for THz and mid-IR light. The major advantage of this method lies in its ability to accurately describe the excitation of graphene surface plasmons (GSPs) in one-dimensional (1D) graphene gratings without the use of both time-consuming, and computationally demanding full-wave numerical simulations. We thus provide analytical expressions for the reflectance, transmittance, and plasmon-enhanced absorbance spectra, which can be readily evaluated using any personal computer with little to no programming. We also introduce a semianalytical method to benchmark our previous results and further compare the theoretical data with spectra taken from experiments, for which we observe a very good agreement. These theoretical tools may therefore be applied to design new experiments and cutting-edge nanophotonic devices based on graphene plasmonics.

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Microwave response of a two-dimensional electron stripe

Cited by 95 publications

References 28 publications

Magnetoplasmon resonance in a two-dimensional electron system driven into a zero-resistance state

Magnetoplasmon resonance in a two-dimensional electron system driven into a zero-resistance state

Fine structure of cyclotron resonance in a two-dimensional electron system

Modeling the excitation of graphene plasmons in periodic grids of graphene ribbons: An analytical approach

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