Thermal vector potential theory of transport induced by temperature gradient

by Prof. Gen Tatara

Monday 7 Dec 2015, 13:30 → 14:30 Asia/Tokyo

Main Research Building 433 (RIKEN Wako)

Date: Dec 7 (Mon) Time: 13:30 - Place: Main Research bldg. 433 Speaker: Gen Tatara (RIKEN) Title: Thermal vector potential theory of transport induced by temperature gradient Abstract: A microscopic formalism to calculate thermal transport coefficients is presented based on a thermal vector potential, whose time-derivative is related to a thermal force [1]. The formalism is free from unphysical divergences reported to arise when Luttinger's formalism [2] is applied naively, because the equilibrium diamagnetic currents are treated consistently. The mathematical structure for thermal transport coefficients are shown to be identical with the electric ones if the electric charge is replaced by energy. The results indicates that the thermal vector potential couples to energy current via the minimal coupling. The formalism is applied to thermally-induced dynamics of magnetization structures [3]. [1] G. Tatara, Phys. Rev. Lett., 114, 196601 (2015). [2] J. M. Luttinger, Phys. Rev., 135, A1505 (1964). [3] G. Tatara, Phys. Rev. B, 92, 064405 (2015). See more QHP seminars