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• W4302759803 abstract "Abstract Localization behaviour is a characteristic feature of the p -type GeSn quantum well (QW) system in a metal–insulator–semiconductor device. The transition to strongly localized behaviour is abrupt with thermally activated conductivity and a high temperature intercept of 0.12 × e 2 ħ −1 at a hole carrier density 1.55 × 10 11 cm −2 . The activation energy for the conductivity in the localized state is 0.40 ± 0.05 meV compared to an activation energy of ∼0.1 meV for conductivity activation to a mobility edge at carrier densities >1.55 × 10 11 cm −2 . Insulating behaviour can occur from a system that behaves as though it is in a minimum metallic state, albeit at high temperature, or from a conductivity greater than a minimum metallic state behaviour showing that local disorder conditions with local differences in the density of states are important for the onset of localization. In the presence of a high magnetic field, thermally activated conductivity is present down to Landau level filling factor < <?CDATA ${1/2}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mn>1</mml:mn> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:math> but without a magnetic-field-dependent carrier density or a variable range hopping (VRH) transport behaviour developing even with conductivity ≪ e 2 h −1 . In the localized transport regime in p -type doped Ge 0.92 Sn 0.08 QWs the VRH mechanism is suppressed at temperatures >100 mK and this makes this two-dimensional system ideal for future many body localization studies in disordered hole gases that can be thermally isolated from a temperature reservoir." @default.
• W4302759803 created "2022-10-07" @default.
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• W4302759803 date "2022-10-13" @default.
• W4302759803 modified "2023-09-30" @default.
• W4302759803 title "Two-dimensional localization in GeSn" @default.
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• W4302759803 doi "https://doi.org/10.1088/1361-648x/ac9814" @default.
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