Abstract
Light–wave quantum electronics utilizes the oscillating carrier wave to control electronic properties with intense laser pulses. Without direct light–spin interactions, however, magnetic properties can only be indirectly affected by the light electric field, mostly at later times. A grand challenge is how to establish a universal principle for quantum control of charge and spin fluctuations, which can allow for faster-than-THz clock rates. Using quantum kinetic equations for the density matrix describing non–equilibrium states of Hubbard quasiparticles, here we show that time–periodic modulation of electronic hopping during few cycles of carrier–wave oscillations can dynamically steer an antiferromagnetic insulating state into a metalic state with transient magnetization. While nonlinearities associated with quasi-stationary Floquet states have been achieved before, magneto–electronics based on quasiparticle acceleration by time–periodic multi–cycle fields and quantum femtosecond/attosecond magnetism via strongly–coupled charge–spin quantum excitations represents an alternative way of controlling magnetic moments in sync with quantum transport.
Highlights
Light–wave quantum electronics utilizes the oscillating carrier wave to control electronic properties with intense laser pulses
Of main interest for this paper is that nonlinear ultrafast processes initiated by coherent photoexcitation can dynamically steer quantum materials to nonequilibrium states that may not be accessible via quasi-equilibrium pathways[3,5,6,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]
By deriving quantum kinetic equations of motion for the density matrix of such Hubbard quasi-particles, we develop a generally applicable model for describing the transient quantum state that evolves in time from a noncollinear spin state driven by a few-cycle bias laser field. The latter dynamics is determined by strongly coupled charge and spin quantum excitations driven by ultrafast modulation in time of interatomic electronic hopping amplitudes
Summary
Light–wave quantum electronics utilizes the oscillating carrier wave to control electronic properties with intense laser pulses. Light-driven in-plane electronic transport from the populated bridge to empty corner sites allows for subsequent interplane hopping to empty sites in the neighboring AFM-coupled planes, which have identical lattice configurations and no energy barrier due to QB.
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