Observation of room-temperature ballistic thermal conduction persisting over 8.3 µm in SiGe nanowires

Hsiao, Tzu-Chien; Chang, Hsien-Chih; Liou, Sz‐Chian; Chu, Ming‐Wen; Lee, Si‐Chen; Chang, Chih-Wei

doi:10.1038/nnano.2013.121

Cited by 164 publications

(165 citation statements)

References 29 publications

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“…We observe that the thermal resistance in the uncorrelated case is significantly more length dependent than in the correlated case where the weak length dependence suggests ballistic heat conduction and is reminiscent of the experimental results observed in Ref. [35]. Qualitatively, the length dependence is also similar to that in Fig.…”

Section: Discussionsupporting

confidence: 85%

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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: Discussionsupporting

confidence: 85%

“…We also interpret the recent findings of ballistic heat conduction in SiGe-alloy nanowires in Ref. [35] in light of our results.…”

Section: Introductionsupporting

confidence: 89%

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

Ong

Zhang

2014

Phys. Rev. B

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“…Recently, we have also recognized the issues mentioned above and directly measured the length-dependent κ of homogeneouslyalloyed SiGe nanowires and heterogeneously-interfaced Si-Ge core-shell nanowires. 14,16 Surprisingly, the l of these SiGe nanowires was found to be 5∼8µm, which is nearly 1000 times longer than that predicted by some theories. 17 Interestingly, the diameter-dependent of κ of the SiGe nanowires displays a much weaker dependence than those observed in Si or Ge nanowires.…”

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confidence: 85%

“…So far only a few experiments have followed this guideline to study l's. [13][14][15][16] Alvarez-Quintana et al studied thickness-dependent cross-plane κ of germanium-on-insulator wafer and estimated the l ∼ 20nm. 13 Johnson et al employed laserinduced transient grating method to study in-plane κ of Si membranes and found the κ deviates from diffusive behavior at several micrometers, suggesting l > 1µm.…”

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confidence: 99%

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Length-dependent thermal transport and ballistic thermal conduction

et al. 2015

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Probing length-dependent thermal conductivity of a given material has been considered as an important experimental method to determine the length of ballistic thermal conduction, or equivalently, the averaged phonon mean free path (l). However, many previous thermal transport measurements have focused on varying the lateral dimensions of samples, rendering the experimental interpretation indirect. Moreover, deducing l is model-dependent in many optical measurement techniques. In addition, finite contact thermal resistances and variations of sample qualities are very likely to obscure the effect in practice, leading to an overestimation of l. We point out that directly investigating one-dimensional length-dependent (normalized) thermal resistance is a better experimental method to determine l. In this regard, we find that no clear experimental data strongly support ballistic thermal conduction of Si or Ge at room temperature. On the other hand, data of both homogeneously-alloyed SiGe nanowires and heterogeneously-interfaced Si-Ge core-shell nanowires provide undisputed evidence for ballistic thermal conduction over several micrometers at room temperature.

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Thermal Conductivity of Amorphous Materials

Zhou

Cheng

Chen

et al. 2019

Adv Funct Materials

173

110

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Thermal conductivity is one of the most fundamental properties of solid materials. The thermal conductivity of ideal crystal materials has been widely studied over the past hundreds years. On the contrary, for amorphous materials that have valuable applications in flexible electronics, wearable electrics, artificial intelligence chips, thermal protection, advanced detectors, thermoelectrics, and other fields, their thermal properties are relatively rarely reported. Moreover, recent research indicates that the thermal conductivity of amorphous materials is quite different from that of ideal crystal materials. In this article, the authors systematically review the fundamental physical aspects of thermal conductivity in amorphous materials. They discuss the method to distinguish the different heat carriers (propagons, diffusons, and locons) and the relative contribution from them to thermal conductivity. In addition, various influencing factors, such as size, temperature, and interfaces, are addressed, and a series of interesting anomalies are presented. Finally, the authors discuss a number of open problems on thermal conductivity of amorphous materials and a brief summary is provided.

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Observation of room-temperature ballistic thermal conduction persisting over 8.3 µm in SiGe nanowires

Cited by 164 publications

References 29 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

Length-dependent thermal transport and ballistic thermal conduction

Thermal Conductivity of Amorphous Materials

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