Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session T40: Exotic Phonon Transport and Polaritons in Nanostructures
11:30 AM–2:30 PM,
Thursday, March 9, 2023
Room: Room 232
Sponsoring
Unit:
DMP
Chair: Xiaoqin Li, University of Texas at Austin
Abstract: T40.00003 : Generalized phonon hydrodynamics in nanostructured semiconductors.
12:18 PM–12:30 PM
Presenter:
Albert Beardo
(University of Colorado, JILA, STROBE)
Authors:
Albert Beardo
(University of Colorado, JILA, STROBE)
Joshua L Knobloch
(University of Colorado, Boulder)
Lluc Sendra Molins
(Autonomous University of Barcelona)
Brendan G McBennett
(JILA)
Emma Nelson
(University of Colorado, Boulder)
Javier Bafaluy
(Autonomous University of Barcelona)
Juan Camacho
(Autonomous University of Barcelona)
Henry C Kapteyn
(University of Colorado)
Margaret M Murnane
(JILA)
F. Xavier Alvarez
(Universitat Autonoma de Barcelona)
The microscopic picture of phonon hydrodynamics is usually associated to the abundance of momentum-conserving collisions in 2D materials, such as graphene at low temperatures. Here, I will show that the applicability of the hydrodynamic heat equation is not restricted to this regime, and can be extended to describe boundary effects in 3D semiconductors. I will introduce recently uncovered general connections between the Boltzmann Transport equation and the mesoscopic hydrodynamic equation [9]. Furthermore, I will discuss the modeling of a variety of experiments displaying non-Fourier behavior in terms of the hydrodynamic framework, including the process of energy release from a nanoscale heat source towards a silicon substrate [5,6], or the unlocking of non-drifting second sound in germanium under a high-frequency laser excitation [7] . Finally, I will compare this interpretation with alternative models like the ballistic suppression of phonons in nanostructures [5].
[1] R.B. Wilson, D. Cahill, Nat. Comm. 5, 5075 (2014)
[2] K. M. Hoogeboom-Pot et. al., PNAS 112 16 4851 (2015)
[4] A. Beardo, et al. Phys. Rev. B 101, 075303 (2020)
[5] A. Beardo, S. Alajlouni, et al. Phys. Rev. B 105, 165303 (2022)
[6] A. Beardo, J. Knobloch, et al. ACS Nano 15, 8, 13019–13030 (2021)
[7] A. Beardo, et al. Sc. Adv. 7, eabg4677 (2021)
[8] A. Beardo, et al. Phys. Rev. Applied 11, 034003 (2019)
[9] L. Sendra, et al. Phys. Rev. B 103, L140301 (2021)
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