Theory of high-field electron transport in the heterostructures AlxGa1-xAs/GaAs/AlxGa1-x with delta-doped barriers. Effect of real-space transfer

Korotyeyev, V. V.

doi:10.15407/spqeo18.01.001

Cited by 4 publications

(2 citation statements)

References 30 publications

(21 reference statements)

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“…2 for AlGaAs/GaAs heterostructure with the electron concentration 0 = 10 11 cm −2 at the applied field 0 = 200 V/cm ( 0 = 7.5 × 10 6 cm/s, taken from the calculation of transport characteristics in Ref. [48]). As seen from Fig.…”

Section: Effect Of the Electron Drift On The Spectral Characteristicsmentioning

confidence: 99%

“…We used the field dependences of the drift velocity, 0 ( 0 ), obtained from the kinetic theory of 2D electrons. The drift velocity and differential electron mobility were calculated with the use of solutions of the Boltzmann transport equation in the frame of the electron temperature approach [48]. In the calculations, we restrict ourselves by the consideration of a range of moderate applied fields, where the dependence of 0 ( 0 ) still shows the quasilinear behavior.…”

Section: Effect Of Electron Heatingmentioning

confidence: 99%

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Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

Lyaschuk¹,

Korotyeyev²

2017

Ukr. J. Phys.

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The theory of non-linear interaction of electromagnetic radiation with hybrid plasmonic structure, which consists of the two-dimensional quantum heterostructure integrated with a plasmonic element in the form of a metal grating, is developed. In particular, the non-linear effect of a detection of high-frequency radiation by a drifting two-dimensional electron gas is examined. Based on the self-consistent solutions of the Maxwell and non-linear hydrodynamic equations in the frames of consistent perturbation theory of the second order, the expression of a photoresponse in the THz region is found. It is shown that the obtained expression contains an additional factor corresponding to the radiative decay rate. The latter was omitted in the previous theories. The presented theory is applied to the analysis of high-frequency properties of hybrid plasmonic structures on the basis of AlGaAs/GaAs quantum heterostructure. The influences of an optically thick substrate and the effect of the electron heating under high electron drifts on the spectral characteristics of the transmission/absorption coefficients and on the photoresponse spectra are analyzed. Some recommendations as for the design of efficient terahertz radiation detectors with the use of the hybrid plasmonic structures as a core element are given. K e y w o r d s: THz plasmonics, THz detection, hybrid plasmonic structures.

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Section: Effect Of the Electron Drift On The Spectral Characteristicsmentioning

confidence: 99%

Section: Effect Of Electron Heatingmentioning

confidence: 99%

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

Lyaschuk¹,

Korotyeyev²

2017

Ukr. J. Phys.

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High‐Field Electron‐Drift Velocity in n‐Type Modulation‐Doped GaAs_0.96Bi_0.04 Quantum Well Structure

Aydın¹,

Mutlu²,

Erol³

et al. 2022

Physica Rapid Research Ltrs

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The drift velocity (vdrift) of electrons in an n‐type modulation‐doped GaAs0.96Bi0.04/Al0.15Ga0.85As quantum well (QW) structure is determined for electric fields (F) ranging from ≈0.4 to 3.58 kV cm−1. The resulting vdrift characteristic exhibited a linear increase and reached ≈6 × 106 cm s−1 at low electric fields then almost saturated with increasing electric field. The electron drift mobility is determined as 2265 cm2 Vs−1 in the regime where the drift velocity is linear with respect to the electric field. The drift velocity saturates at ≈6.1 × 106 cm s−1 at the electric fields between ≈2.7 and 3.4 kV cm−1. Saturation of the drift velocity is attributed to the transfer of the electrons from the QW layer (GaAs0.96Bi0.04) with higher electron mobility to the barrier layer (Al0.15Ga0.85As) and satellite valley L‐valley with lower electron mobility, which initiates cooling of electrons via phonon scattering in the sample.

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Spatial dispersion of the high-frequency conductivity of two-dimensional electron gas subjected to a high electric field: Collisionless case

Korotyeyev

Kochelap

Danylyuk

et al. 2018

Applied Physics Letters

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We present the analysis of high-frequency (dynamic) conductivity with the spatial dispersion, σ(ω, q), of two-dimensional electron gas subjected to a high electric field. We found that at finite wavevector, q, and at high fields, the high-frequency conductivity shows following peculiarities: strong non-reciprocal dispersion; oscillatory behavior; a set of frequency regions with negative σ ′ ; non-exponential decay of σ ′ and σ ′′ with frequency (opposite to the Landau damping mechanism). We illustrate the general results by calculations of spectral characteristics of particular plasmonic heterostructures on the basis of III-V semiconductor compounds. We conclude that the detailed analysis of the spatial dispersion of the dynamic conductivity of 2DEG subjected to high electric fields is critically important for different THz applications.

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Theory of high-field electron transport in the heterostructures AlxGa1-xAs/GaAs/AlxGa1-x with delta-doped barriers. Effect of real-space transfer

Cited by 4 publications

References 30 publications

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

High‐Field Electron‐Drift Velocity in n‐Type Modulation‐Doped GaAs_0.96Bi_0.04 Quantum Well Structure

Spatial dispersion of the high-frequency conductivity of two-dimensional electron gas subjected to a high electric field: Collisionless case

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Theory of high-field electron transport in the heterostructures AlxGa1-xAs/GaAs/AlxGa1-x with delta-doped barriers. Effect of real-space transfer

Cited by 4 publications

References 30 publications

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

Theory of Detection of Terahertz Radiation in Hybrid Plasmonic Structures with Drifting Electron Gas

High‐Field Electron‐Drift Velocity in n‐Type Modulation‐Doped GaAs0.96Bi0.04 Quantum Well Structure

Spatial dispersion of the high-frequency conductivity of two-dimensional electron gas subjected to a high electric field: Collisionless case

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High‐Field Electron‐Drift Velocity in n‐Type Modulation‐Doped GaAs_0.96Bi_0.04 Quantum Well Structure