Presentation Information

3:45 PM - 4:00 PM JST(6:45 AM - 7:00 AM UTC)English Presentation

[9p-A23-7]Transfer of Orbital Angular Momentum to Free Electrons in Semiconductors Driven by Vortex Laser

〇(D)JIAMING ZHANG¹, Ken Morita², Kosaku Kato¹, Thanh Nhat Khoa Phan¹, Verdad C. Agulto¹, Makoto Nakajima¹ (1.The Univ. of Osaka, 2.Chiba Univ.)

Keywords:

vortex laser,free electron,orbital angular momentum

We investigate the torque exerted by a 1030 nm femtosecond vortex beam on thermally generated free carriers in GaAs. Under collisionless conditions with only Lorentz and Coulomb forces, no stable torque appears. Including damping (scattering/recombination) produces a stable rotational torque correlated with the beam's orbital angular momentum, and the torque magnitude increases with the damping coefficient.

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