Spin phonon interactions and magneto-thermal transport behavior in p-Si

TL;DR

This study provides experimental evidence that spin-phonon interactions in p-doped silicon influence thermal conductivity, with magnetic fields altering phonon behavior and thermal transport, supported by spectroscopy and first-principles calculations.

Contribution

First experimental demonstration of spin-phonon coupling effects on thermal transport in silicon using combined magneto-thermal and spectroscopic methods.

Findings

Spin polarization softens phonon modes and reduces thermal conductivity.

Magnetic fields modulate electrical and thermal transport via spin-phonon interactions.

Temperature affects spin-phonon relaxation behavior, especially at low temperatures.

Abstract

The spin-phonon interaction is the dominant process for spin relaxation in Si, and as thermal transport in Si is dominated by phonons, one would expect spin polarization to influence Si's thermal conductivity. Here we report the experimental evidence of just such a coupling. We have performed concurrent measurements of spin, charge, and phonon transport in p-doped Si across a wide range of temperatures. In an experimental system of a freestanding two um p-Si beam coated on one side with a thin (25 nm) ferromagnetic spin injection layer, we use the self-heating 3 omega method to measure changes in electrical and thermal conductivity under the influence of a magnetic field. These magneto-thermal transport measurements reveal signatures in the variation of electrical and thermal transport that are consistent with spin-phonon interaction. Raman spectroscopy measurements and first principle's calculations support that these variations are due to spin-phonon interaction. Spin polarization leads to softening of phonon modes, a reduction in the group velocity of acoustic modes, and a subsequent decrease in thermal conductivity at room temperature. Moreover, magneto-thermal transport measurements as a function of temperature indicate a change in the spin-phonon relaxation behavior at low temperature.