Kavli Affiliate: Joel E. Moore
| First 5 Authors: Yu-Ping Lin, Vidya Madhavan, Joel E. Moore, ,
| Summary:
We show that ultrafast optical pump pulses provide effective control over
charge orders in the kagome metals $A$V$_3$Sb$_5$ with $A=$ K, Rb, and Cs.
Starting from the real charge density waves (rCDWs) at the $p$-type Van Hove
singularity, we conduct a thorough analysis of the post-pump dynamics by
time-dependent Hartree-Fock theory. Our analysis uncovers distinct dynamical
phenomena under linearly and circularly polarized pumps. Linearly polarized
pumps induce directional preferences in the rCDWs, accompanied by an
enhancement in the flat band. Unexpectedly, charge nematicity also emerges and
receives maximal enhancement at a resonant pump frequency, which we understand
with a Rabi-oscillation-like model. On the other hand, circularly polarized
pumps suppress the rCDWs uniformly and triggers imaginary CDWs (iCDWs) with
charge loop currents. Our results can be directly compared to the pump-probe
experiments on the kagome metals $A$V$_3$Sb$_5$.
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