Electrical generation and absorption of phonons in carbon nanotubes

LeRoy, Brian J.; Lemay, Serge G.; Kong, Jing; Dekker, Cees

doi:10.1038/nature03046

Cited by 313 publications

(413 citation statements)

References 18 publications

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“…Such rethinking has far reaching implications for phonon interactions with other quantum particles such as neutrons, electrons and photons, since the momentum associated with diffusons and locons is unclear. [41][42][43][44][45][46][47][48][49] Furthermore, the results herein have shown that phonons cannot in general be thought of exclusively as plane waves. Instead, we believe a more general perspective is to classify phonons according to the three groups identified by Allen and Feldman, 10 and more generally think of a phonon as "a quanta of normal mode vibrational energy".…”

Section: Resultsmentioning

confidence: 92%

“…Temperature-dependent TC of In 0.53 Ga 0. 47 As for different thin film thicknesses and the corresponding theoretical predictions using VCA and GKMA. Mathiessen's rule was used to apply boundary scattering to all the modes in VCA.…”

Section: Resultsmentioning

confidence: 99%

“…The predictions were then compared to TC measurements determined by time domain thermoreflectance measurements of single crystalline In 0.53 Ga 0. 47 As thin film samples that were grown on single crystalline InP substrates via metal-organic chemical vapor deposition (see Supplementary Materials for details).…”

Section: Resultsmentioning

confidence: 99%

“…We have calculated the modal TC contributions at eight temperatures for the In 0.53 Ga 0. 47 As system. For the intermediate temperatures, we linearly interpolated the TC of each mode, using data for 50, 100, 200, 300, 400, 500, 600, and 700 K. The GKMA results of individual mode TC are then multiplied by the quantum-corrected specific heat at the temperature of interest,…”

Section: Methodsmentioning

confidence: 99%

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Rethinking phonons: The issue of disorder

et al. 2017

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Current understanding of phonons treats them as plane waves/quasi-particles of atomic vibration that propagate and scatter. The problem is that conceptually, when any level of disorder is introduced, whether compositional or structural, the character of vibrational modes in solids changes, yet nearly all theoretical treatments continue to assume phonons are still waves. For example, the phonon contributions to alloy thermal conductivity (TC) rely on this assumption and are most often computed from the virtual crystal approximation (VCA). Good agreement is obtained in some cases, but there are many instances where it fails-both quantitatively and qualitatively. Here, we show that the conventional theory and understanding of phonons requires revision, because the critical assumption that all phonons/normal modes resemble plane waves with well-defined velocities is no longer valid when disorder is introduced. Here we show, surprisingly, that the character of phonons changes dramatically within the first few percent of impurity concentration, beyond which phonons more closely resemble the modes found in amorphous materials. We then utilize a different theory that can treat modes with any character and experimentally confirm its new insights.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Rethinking phonons: The issue of disorder

et al. 2017

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“…The suspended carbon nanotube can be considered as a quantum dot coupled to the surrounding electrodes through tunnel junctions. Low-temperature tunneling spectroscopy studies on freely hanging carbon nanotubes have shown that inelastic electron tunneling can create a non-thermal equilibrium population of the vibronic states of the nanotube [11].…”

Section: The Model Hamiltonianmentioning

confidence: 99%

Suppression of the stochastic fluctuations of suspended nanowires by temperature-induced single-electron tunneling

et al. 2011

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Abstract. We theoretically investigate the electromechanical properties of freely suspended nanowires that are in tunneling contact with the tip of a scanning tunneling microscope (STM) and two supporting metallic leads. The aim of our analysis is to characterize the fluctuations of the dynamical variables of the nanowire when a temperature drop is maintained between the STM tip and the leads, which are all assumed to be electrically grounded. By solving a quantum master equation that describes the coupled dynamics of electronic and mechanical degrees of freedom, we found that the stationary state of the mechanical oscillator has a Gaussian character, but that the amplitude of its rootmean square center-of-mass fluctuations is smaller than would be expected if the system were coupled only to the leads at thermal equilibrium.

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