Growth and self-organization of SiGe nanostructures

Aqua, Jean-Noël; Berbézier, Isabelle; Favre, Luc; Frisch, Thomas; Ronda, A.

doi:10.1016/j.physrep.2012.09.006

Cited by 194 publications

(162 citation statements)

References 482 publications

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“…In the perfect alloy, the solubility of the component species is assumed to be equal and the atoms are randomly distributed across lattice sites. However, differences in miscibility and growth kinetics [40] may lead to phase segregation or the formation of domains, [41] introducing short-range order in the mass distribution and forming semi-extended high-frequency modes that are spatially larger than the correlation length. Hence, it is possible for an alloy 1D nanostructure to conduct heat ballistically at a finite length scale that is much larger than the average domain size.…”

Section: Discussionmentioning

confidence: 99%

Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder

Ong

Zhang

2014

Phys. Rev. B

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Short-range order in strongly disordered structures plays an important role in their heat conduction property. Using numerical and analytical methods, we show that short-range spatial correlation (with a correlation length of Λm) in the mass distribution of the one-dimensional (1D) alloy-like random binary lattice leads to a dramatic enhancement of the high-frequency phonon transmittance but also increases the low-frequency phonon opacity. High-frequency semi-extended states are formed while low-frequency modes become more localized. This results in ballistic heat conduction at finite lengths but also paradoxically higher thermal resistance that scale as √ Λm in the L → ∞ limit. We identify an emergent crossover length (Lc) below which the onset of thermal transparency appears. The crossover length is linearly dependent on but is two orders of magnitude larger than Λm. Our results suggest that the phonon transmittance spectrum and heat conduction in a disordered 1D lattice can be controlled via statistical clustering of the constituent component atoms into domains. They also imply that the detection of ballistic heat conduction in disordered 1D structures may be a signature of the intrinsic mass correlation at a much smaller length scale.

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Section: Discussionmentioning

confidence: 99%

Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder

Ong

Zhang

2014

Phys. Rev. B

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Section: ³õâõëôõëúçôíââ õçñóëâ óçðõåçðñäôíñì Aeë×óâíùëëunclassified

High-resolution X-ray diffraction in crystalline structures with quantum dots

Пунегов¹

2015

Usp. Fiz. Nauk

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“…Хорошо известно, что для широкого диапазона со-ставов напряженных (сжатых) структур Si 1−x Ge x /Si(001) упругая релаксация напряжений через образование са-моформирующихся наноостровков предшествует пла-стической релаксации за счет формирования дефек-тов (см., например, обзоры [1,2]). Однако сам меха-низм зарождения наноостровков несколько различен для структур с большой и малой долей Ge.…”

Section: Introductionunclassified

Влияние шероховатости поверхности на смену режима роста с двумерного на трехмерный в напряженных SiGe-гетероструктурах

Новиков¹,

Шалеев²,

Юрасов³

et al. 2016

Физика И Техника Полупроводников

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Исследовано влияние микрошероховатости поверхности роста на критическую толщину двумерного роста напряженных SiGe-структур, выращенных на подложках Si(001) и Ge(001). Для решеток Ge/Si, выращенных на подложках Si(001), обнаружено уменьшение критической толщины двумерного роста Ge при увеличении числа периодов решетки или уменьшении толщины разделительных слоев Si, которое связывается с увеличением шероховатости поверхности роста по мере накопления в сжатых структурах упругой энергии. Сравнительные исследования роста SiGe-структур на подложках Si(001) и Ge(001) показали, что в широком диапазоне составов слоев SiGe при одинаковом по абсолютной величине рассогласовании кристаллических решеток пленки и подложки критическая толщина двумерного роста растянутых слоев значительно больше, чем сжатых.

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Growth and self-organization of SiGe nanostructures

Cited by 194 publications

References 482 publications

Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder

Enhancement and reduction of one-dimensional heat conduction with correlated mass disorder

High-resolution X-ray diffraction in crystalline structures with quantum dots

Влияние шероховатости поверхности на смену режима роста с двумерного на трехмерный в напряженных SiGe-гетероструктурах

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