Non-equilibrium dynamics of multi-orbital system under time-depending electric field

時間変動する電場の下での多軌道系の非平衡ダイナミクス

We investigate the real-time dynamics under time-depending electric fields in a one-dimensional orbital degenerate Hubbard model, using a time-dependent density matrix renormalization group method. Considering a chain along the direction with $e_{rm g}$ -orbital degrees of freedom on each site, electrons preferably occupy itinerant $d_{3z^2-r^2}$ orbitals rather than localized $d_{x^2-y^2}$ orbitals to gain kinetic energy. Thus, in the ground state at quarter filling, $d_{3z^2-r^2}$ orbital is singly occupied, while the spin state exhibits antiferromagnetic correlations for small Hund's rule coupling. After the oscillating electric field is turned on, holon-doublon pairs are introduced when the frequency of the applied electric field exceeds a charge excitation gap. During the time evolution, the ferro-orbital state is deformed due to the pair-hopping interaction that is characteristic of multi-orbital systems.

使用言語	:	English
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発表会議名	:	Joint European Magnetic Symposia (JEMS 2010)
開催年月	:	2010/08
開催都市	:	Krakw
開催国	:	Poland
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