Magnetotransport study of quantum wires

Mani, R. G.; Klitzing, K. von; Vasiliadou, E.; Grambow, P.; Ploog, K.

doi:10.1016/0039-6028(94)90972-5

Cited by 18 publications

(9 citation statements)

References 10 publications

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“…In both cases (with and without a CAP), an oscillation of the tensors with increasing magnetic field was observed, and the oscillation amplitudes of the tensors grew as the magnitude of the magnetic induction was increased. The oscillations of kinetic tensors was also presented in theoretical research on thermo-magnetoelectric phenomena in 2DS [6,8,9] and in experimental observation for the low-dimensional GaAs/AlGaAs structure [24]. The appearance of Shubnikov-de Hass (SdH) oscillations confirms the presence of Landau quantization with increasing magnetic field [24].…”

Section: Numerical Results and Discussionmentioning

confidence: 63%

“…The oscillations of kinetic tensors was also presented in theoretical research on thermo-magnetoelectric phenomena in 2DS [6,8,9] and in experimental observation for the low-dimensional GaAs/AlGaAs structure [24]. The appearance of Shubnikov-de Hass (SdH) oscillations confirms the presence of Landau quantization with increasing magnetic field [24]. However, due to the phonon confinement, tensors have smaller values in comparison with unconfined phonon case [8].…”

Section: Numerical Results and Discussionmentioning

confidence: 68%

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Doped Two-dimensional Semiconductor Superlattice: Photo-stimulated Quantum Thermo-magnetoelectric Effects under the Influence of a Confined Phonon

Bau

Quỳnh

et al. 2020

J. Korean Phys. Soc.

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Photo-stimulated quantum thermo-magnetoelectric effects in doped two-dimensional semiconductor superlattices, including the photo-stimulated quantum Ettingshausen effect and the photostimulated quantum Peltier effect, have been theoretically studied by using the quantum kinetic equation method. In this work, we assume that the electron-confined acoustic phonon scattering is essential. Moreover, the presence of the laser radiation (LR) is also taken into account to determine the influence of confined phonons on the aforementioned effects. We have defined the analytical expressions for the kinetic tensors and the Ettingshausen and the Peltier coefficients, presented the numerically calculated the theoretical results for the GaAs:Si/GaAs:Be doped semiconductor superlattice and compared them with these for the case of an unconfined acoustic phonon. The results obtained indicated that the formulas for the kinetic tensors, the Ettingshausen coefficient (EC) and the Peltier coefficient (PC) contain the quantum number m specifying the confinement of a phonon and approach the results for an unconfined phonon as m goes to zero. We found that the kinetic tensors, the EC and the PC oscillate with changing magnetic field and that the confinement of a phonon causes a shift of the peaks in these oscillations to lower energy. The dependences of both EC and PC on the temperature were found to be nonlinear. Moreover, all the coefficients level off when the temperature was less than 4.5 K or greater than 5.5 K. The EC also depended on the doping concentration in a nonlinear way and reaches a positive constant value when the semiconductor superlattice was doped with a high concentration. Most of the numerical results showed that the magnitude of the tensors, the EC as well as the PC, within a confined acoustic phonon varie significantly in comparison with the unconfined phonon case. This means that the confinement of the phonon affects the thermo-magnetoelectric effect quantitatively and qualitatively. These results contribute to completing the theory of the thermo-magnetoelectric effects in the low-dimensional semiconductor systems.

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Section: Numerical Results and Discussionmentioning

confidence: 63%

Section: Numerical Results and Discussionmentioning

confidence: 68%

Doped Two-dimensional Semiconductor Superlattice: Photo-stimulated Quantum Thermo-magnetoelectric Effects under the Influence of a Confined Phonon

Bau

Quỳnh

et al. 2020

J. Korean Phys. Soc.

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“…For instance, the fact that SdH oscillations can barely be seen in some range of magnetic field at V g ϭϪ0. 24 and Ϫ0.32 V ͓Fig. 3͑b͔͒ can possibly be attributed, at least in part, to this effect.…”

Section: A Weak Modulationmentioning

confidence: 87%

“…On the experimental point of view, electrical transport measurements have revealed quasi-1D effects in single wire systems as well as in wire arrays. [15][16][17][18][19][20][21][22][23][24][25][26] Transport measurements also revealed new physical phenomena such as Weiss oscillations [27][28][29][30][31][32][33][34] and electron focusing, 35 which are other useful probes of the electron gas properties. Another way to probe the electron gas is through optical measurements.…”

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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“…Due to the effect of confined AP, the oscillation of σ xx decreased faster. Besides, experimental observation for the GaAs/AlGaAs structure has indicated that the oscillation also appeared when the magnetic field changed [24]. The influence of magnetic field on σ xx showed that the fresh high-B characteristics in wires and the magnetic fluctuation of conductivity tensor was made by confinement plus phase coherence in the confined direction.…”

Section: The Analytical Expression For the Peltier Coefficientmentioning

confidence: 99%

Cylindrical quantum wires: the Quantum photo-stimulated Peltier effect under the influence of confined acoustic phonons

Ngoc

Anh

Dien

et al. 2022

J. Phys.: Conf. Ser.

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The Quantum photo-stimulated Peltier effect has been theoretically studied under the influence of confined acoustic phonon in a cylindrical quantum wires with an infinite potential by using the quantum kinetic equation method. In this work, we assume that the confined electrons-confined acoustic phonons scattering is essential. Moreover, the presence of a strong electromagnetic wave (EMW) is also taken into account to determine the influence of confined phonons on the aforementioned effects. We have defined the analytical expressions for the kinetic tensors and the Peltier coefficients (PC). In detailed consideration, the quantum number m1, m2 were changed in order to characterize the influence of confined acoustic phonon (confined AP). As the radius of the wire increases to infinity, we obtained the results that corresponded to the case of bulk phonons (unconfined AP). The theoretical results have been numerically evaluated and discussed for the GaAs/AlGaAs cylindrical quantum wires (CQW). The change of PC in two cases unconfined AP and confined AP have been found according to augment of EMW frequency. The value of resonant peaks has altered under the effect of confined AP. The difference of PC also has been discovered when investigating its dependence on the cyclotron frequency. Furthermore, the PC reduced suddenly when considering the dependence of PC on the radius of wire and PC on the low temperature. All numerical showed that the magnitude of PC diverse significantly in comparison with unconfined AP case and doped two - dimensional semiconductor superlattice. This means that the confinement of the phonon affects the Peltier effect quantitatively and qualitatively. These results are new and provide to completing the theory of the Peltier effect in low-dimensional semiconductor systems.

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Magnetotransport study of quantum wires

Cited by 18 publications

References 10 publications

Doped Two-dimensional Semiconductor Superlattice: Photo-stimulated Quantum Thermo-magnetoelectric Effects under the Influence of a Confined Phonon

Doped Two-dimensional Semiconductor Superlattice: Photo-stimulated Quantum Thermo-magnetoelectric Effects under the Influence of a Confined Phonon

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

Cylindrical quantum wires: the Quantum photo-stimulated Peltier effect under the influence of confined acoustic phonons

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