Millimeter wave radiation-induced magnetoresistance oscillations in the high quality GaAs/AlGaAs 2D electron system under bichromatic excitation

Gunawardana, Binuka; Liu, H. C.; Samaraweera, Rasanga; Heimbeck, Martin S.; Everitt, Henry O.; Iñarrea, Jesús; Reichl, Christian; Wegscheider, Werner; Mani, R. G.

doi:10.1103/physrevb.95.195304

Cited by 7 publications

(3 citation statements)

References 86 publications

(74 reference statements)

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“…Interesting experimental features examined by experiment include the 1/4 cycle phase shift 1,5,8 , the non-linear increase in the amplitude of the radiation-induced oscillations with the microwave power 19,55 , observed correlations between the magnetoresistance oscillations and microwave reflection 8,25 from the 2DES, polarization sensitivity, 22,28,29,31 , and magnetoresistive response under bichromatic excitation. 10,42 . Observed oscillatory phenomena in the photoexcited twodimensional electron systems have been considered by the displacement model, 43,46,48,49 the microwave driven electron orbital model, 44,55 the inelastic model, 51 and a memory effect theory.…”

Section: Introductionmentioning

confidence: 99%

Electron heating induced by microwave photoexcitation in the GaAs/AlGaAs two-dimensional electron system

et al. 2018

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We examined the influence of microwave radiation on both the amplitude of Shubnikov-de Haas (SdH) oscillations and the null field longitudinal magnetoresistance at liquid helium temperatures, in GaAs/AlGaAs Hall bar devices. Microwave radiation over the frequency range 25 ≤ f ≤ 50 GHz with source power 0 ≤ P ≤ 4 mW served to photo-excite the high mobility (10 7 cm 2 /V s) 2D electron system (2DES) as magnetoresistance traces were obtained as a function of the microwave power P and temperature T. Lineshape study of SdH oscillations has been carried out over the span 2.3 < ωc/ω ≤ 5.2, where ωc = eB/m * , ω = 2πf , B is the magnetic field, m * is the effective mass and f is the microwave frequency. Here, fits of the SdH lineshape served to determine the electron temperature (Te) as a function of P and T. Theory has proposed that, in the ωc/ω ≥ 1 regime, both the electron temperature and radiation energy absorption rate (Sp) exhibit relatively small response, while in the ωc/ω ≤ 1 regime, both Te and Sp are enhanced and exhibit oscillatory behavior. We compare the experimental results with these theoretical predictions, and comment upon relative role of electron heating in the microwave photo-excited high mobility 2DES.

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Section: Introductionmentioning

confidence: 99%

Electron heating induced by microwave photoexcitation in the GaAs/AlGaAs two-dimensional electron system

et al. 2018

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“…For the latter case, a sublinear law is obtained for the dependence of RIRO on the radiation power, R xx ∝ P α , where P is the radiation power and, interestingly, the exponent is around 0.5. This clearly indicates a squared root dependence 7 – 16 .…”

Section: Introductionmentioning

confidence: 88%

Radiation-induced resistance oscillations in 2D electron systems with strong Rashba coupling

Iñarrea

2017

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We present a theoretical study on the effect of radiation on the mangetoresistance of two-dimensional electron systems with strong Rashba spint-orbit coupling. We want to study the interplay between two well-known effects in these electron systems: the radiation-induced resistance oscillations and the typical beating pattern of systems with intense Rashba interaction. We analytically derive an exact solution for the electron wave function corresponding to a total Hamiltonian with Rashba and radiation terms. We consider a perturbation treatment for elastic scattering due to charged impurities to finally obtain the magnetoresistance of the system. Without radiation we recover a beating pattern in the amplitude of the Shubnikov de Hass oscillations: a set of nodes and antinodes in the magnetoresistance. In the presence of radiation this beating pattern is strongly modified following the profile of radiation-induced magnetoresistance oscillations. We study their dependence on intensity and frequency of radiation, including the teraherzt regime. The obtained results could be of interest for magnetotransport of nonideal Dirac fermions in 3D topological insulators subjected to radiation.

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“…The available experimental evidence proves that these oscillations present some features that can be considered universal: they are periodic in B −1 , present a 1/4 cycle phase shift in the oscillations minima 3 , are sensitive to temperature (T) 4,5 , present a non-linear increase with the radiation power ( P ) (squared root dependence) 6–16 , are immune to the sense of circular polarization in the incident radiation 17 , and other intriguing phenomena. Different theoretical models have been presented to try to explain the origin of these effects and their features 18–29 .…”

Section: Introductionmentioning

confidence: 99%

Microscopic model for radiation-induced magnetoresistance oscillations excited by circularly polarized radiation

Iñarrea

2019

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We develop a microscopic model to explain the striking result of immunity to the sense of circularly polarized radiation of the photo-excited resistance oscillations in high-mobility 2D electron systems. Our model is based on the radiation-driven electron orbit model, previously developed to explain the photo-induced resistance oscillations and zero resistance states in these systems. According to it, the guiding center of the Landau states when irradiated by circularly polarized radiation performs a circular path driven by radiation. In principle, in an infinite sample, this path is different according to the the sense of circular polarization (left or right). However, the limited size of the sample with the essential role of the edges and the concurrent presence of the Hall electric field tend to quench the displacement of the driven guiding center making nearly equal both trajectories. In the end and in the presence of scattering, the longitudinal irradiated magnetoresistance turns out nearly the same irrespective of the sense of circular radiation.

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Millimeter wave radiation-induced magnetoresistance oscillations in the high quality GaAs/AlGaAs 2D electron system under bichromatic excitation

Cited by 7 publications

References 86 publications

Electron heating induced by microwave photoexcitation in the GaAs/AlGaAs two-dimensional electron system

Electron heating induced by microwave photoexcitation in the GaAs/AlGaAs two-dimensional electron system

Radiation-induced resistance oscillations in 2D electron systems with strong Rashba coupling

Microscopic model for radiation-induced magnetoresistance oscillations excited by circularly polarized radiation

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