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MM: Fachverband Metall- und Materialphysik

MM 27: Transport in Materials: Diffusion, Charge or Heat Conduction

MM 27.8: Vortrag

Donnerstag, 20. März 2025, 12:15–12:30, H22

Phonon induced heat transfer between gold nanogap electrodes — •Yuki Hanamura, Kazuma Kishimoto, Mizuki Tada, Ryo Yamada, and Hirokazu Tada — Graduate School of Engineering Science, Osaka University, Japan

Recent studies have observed anomalous increases in thermal conductance in nanogaps narrower than a few nanometers [1]. Theoretical models attribute this phenomenon to electron tunneling effects and propagation of lattice vibrations due to mechanical interactions between the electrodes, i.e., phonon transport [2]. Experimental difficulties in the nanoscale have prevented us from sufficiently understanding the heat transfer mechanisms.

We have developed a device to measure both thermal and electrical conductance across nanogap electrodes. The device comprises a suspended structure with Micro Electro Mechanical System (MEMS) based actuators to tune the gap distance. We observed increased thermal conductances in sufficiently separated nanogaps, even in the absence of electron tunneling, suggesting phonon transport as the dominant mechanism [3]. We will show the effects of electrode gap distance and temperature on heat transfer across the nanogap.

[1] M. Pascale et al., Appl. Phys. Lett. 122, 100501 (2023).

[2] T. Tokunaga et al., Phys. Rev. B 104, 125404 (2021).

[3] Y. Hanamura et al., Nanoscale, in press.

Keywords: Heat transfer; Nanogap; Phonon; Near-field effect; MEMS