Suspended semiconductor nanostructures: physics and technology

Abstract

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.

Effective dynamics for a spin-1/2 particle constrained to a curved layer with inhomogeneous thickness

“…However, with advancements in micro and nanofabrication technology, laboratories are now able to manufacture nanostructures with various geometries. [1][2][3][4][5] Some of these low-dimensional nanostructures exhibit significant curvature, offering excellent platforms for studying the impact of curvature on quantum particles. With the aid of analog models, experiments involving different dynamics on a curved surface are expected to shed light on how space curvature influences the corresponding evolution processes.…”

Calculation and design of GaAs quantum dot devices where the vibrational modes can be frozen out at cryogenic temperatures

“…Micro/nano electromechanical systems (MEMS/NEMS) have attracted a lot of attention over the past 30 years, as these devices can show very high fundamental resonance frequencies, have negligible mass and can exhibit very high quality factors resonances [1][2][3][4][5][6][7][8][9][10][11][12]. The MEMS/NEMS systems, combine mechanical and electrical components and can ranges from a few tens of nanometres to hundreds of micrometres.…”

Актуальные Проблемы Физики Полупроводников: Наноструктуры, Эпитаксия, Фотоника И Электроника. Научные Результаты ИФП СО РАН За 2022 Год

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