Ballistic magnetotransport in a suspended two-dimensional electron gas with periodic antidot lattices

Zhdanov, E. Yu.; Pogosov, A. G.; Budantsev, M. V.; Pokhabov, D. A.; Bakarov, A. K.

doi:10.1134/s1063782617010250

Cited by 12 publications

(7 citation statements)

References 8 publications

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“…For example, a significant increase in the charging energy (by a factor of 4 to 170 K in temperature units) of a quantum dot in the Coulomb blockade mode after suspension was found [71,72]. The enhancement of the e-e interaction is also confirmed by other experiments with suspended nanostructures [73]. The effect of suspension of QPC on the conductance characteristics were investigated [74].…”

Section: E-e Coupling Enhancement In Suspended Qpcmentioning

confidence: 59%

“…In contrast to other mesoscopic structures, such as, for example, QPCs, the first magnetoresistance measurements revealed no features of suspended antidot lattices in comparison to their non-suspended counterparts. Moreover, when temperature increases up to 50 K, the commensurability oscillations are almost identically suppressed, regardless of whether the samples are suspended or not [73] (see figure 17). This similarity can be explained by the fact that low-B magnetoresistance is determined by classical geometrical effects, and the suppression is caused by the temperature-induced Fermi-level spreading, which is identical in suspended and non-suspended samples.…”

Section: Magnetoresistance Of Suspended Electron Billiardsmentioning

confidence: 91%

“…The behavior of these trajectories is illustrated in figure 15 demonstrating the section of the Poincare map (ϕ, ψ) → ϕ , ψ in terms of angles ϕ and ψ, shown in the inset to the figure. The color indicates the number N of consecutive jumps occurring without failure [73]. Large white area corresponds to N exceeding 100.…”

Section: Dynamical Chaos In Electron Billiardsmentioning

confidence: 99%

“…These include conductance (resistance), discussed in subsection 3.2, thermopower and thermoconductance, discussed in subsection 3.3. Reproduced from [73], with permission from Springer Nature.…”

Section: Dynamical Chaos In Electron Billiardsmentioning

confidence: 99%

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Suspended semiconductor nanostructures: physics and technology

Pogosov

Shevyrin

Pokhabov

et al. 2022

J. Phys.: Condens. Matter

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The current state of research on quantum and ballistic electron transport in semiconductor nanostructures with a two-dimensional electron gas separated from the substrate and nanoelectromechanical systems is reviewed. These nanostructures fabricated using the surface nanomachining technique have certain unexpected features in comparison to their non-suspended counterparts, such as additional mechanical degrees of freedom, enhanced electron–electron interaction and weak heat sink. Moreover, their mechanical functionality can be used as an additional tool for studying the electron transport, complementary to the ordinary electrical measurements. The article includes a comprehensive review of spin-dependent electron transport and multichannel effects in suspended quantum point contacts, ballistic and adiabatic transport in suspended nanostructures, as well as investigations on nanoelectromechanical systems. We aim to provide an overview of the state-of-the-art in suspended semiconductor nanostructures and their applications in nanoelectronics, spintronics and emerging quantum technologies.

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Section: E-e Coupling Enhancement In Suspended Qpcmentioning

confidence: 59%

Section: Magnetoresistance Of Suspended Electron Billiardsmentioning

confidence: 91%

Section: Dynamical Chaos In Electron Billiardsmentioning

confidence: 99%

Section: Dynamical Chaos In Electron Billiardsmentioning

confidence: 99%

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Suspended semiconductor nanostructures: physics and technology

Pogosov

Shevyrin

Pokhabov

et al. 2022

J. Phys.: Condens. Matter

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“…Very recently, Zhdanov et al . 39 and Pokabov et al . 40 performed conductance measurements on unsuspended and suspended GaAs QPCs with in-plane SGs and the 0.5G o conductance plateau was only observed for the latter.…”

Section: Introductionmentioning

confidence: 94%

Width dependence of the 0.5 × (2e2/h) conductance plateau in InAs quantum point contacts in presence of lateral spin-orbit coupling

Das

Cahay

Kalita

et al. 2019

Sci Rep

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The evolution of the 0.5G o (G o = 2e 2 /h) conductance plateau and the accompanying hysteresis loop in a series of asymmetrically biased InAs based quantum point contacts (QPCs) in the presence of lateral spin-orbit coupling (LSOC) is studied using a number of QPCs with varying lithographic channel width but fixed channel length. It is found that the size of the hysteresis loops is larger for QPCs of smaller aspect ratio (QPC channel width/length) and gradually disappears as their aspect ratio increases. The physical mechanisms responsible for a decrease in size of the hysteresis loops for QPCs with increasing aspect ratio are: (1) multimode transport in QPCs with larger channel width leading to spin-flip scattering events due to both remote impurities in the doping layer of the heterostructure and surface roughness and impurity (dangling bond) scattering on the sidewalls of the narrow portion of the QPC, and (2) an increase in carrier density resulting in a screening of the electron-electron interactions in the QPC channel. Both effects lead to a progressive disappearance of the net spin polarization in the QPC channel and an accompanying reduction in the size of the hysteresis loops as the lithographic width of the QPC channel increases.

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Lateral-electric-field-induced spin polarization in a suspended GaAs quantum point contact

Pokhabov

Pogosov

Zhdanov

et al. 2018

Applied Physics Letters

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The conductance of a GaAs-based suspended quantum point contact (QPC) equipped with lateral side gates has been experimentally studied in the absence of the external magnetic field. The half-integer conductance plateau (0.5×2e2/h) has been observed when an asymmetric voltage between the side gates is applied. The appearance of this plateau has been attributed to the spin degeneracy lifting caused by the spin-orbit coupling associated with the lateral electric field in the asymmetrically biased QPC. We have experimentally demonstrated that, despite the relatively small g-factor in GaAs, the observation of the spin polarization in the GaAs-based QPC became possible after the suspension due to the enhancement of the electron-electron interaction and the effect of the electric field guiding. These features are caused by a partial confinement of the electric field lines within a suspended semiconductor layer with a high dielectric constant.

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Ballistic magnetotransport in a suspended two-dimensional electron gas with periodic antidot lattices

Cited by 12 publications

References 8 publications

Suspended semiconductor nanostructures: physics and technology

Suspended semiconductor nanostructures: physics and technology

Width dependence of the 0.5 × (2e2/h) conductance plateau in InAs quantum point contacts in presence of lateral spin-orbit coupling

Lateral-electric-field-induced spin polarization in a suspended GaAs quantum point contact

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