Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session TT06: V: Open Quantum Systems
3:30 PM–5:30 PM,
Tuesday, March 21, 2023
Room: Virtual Room 6
Sponsoring
Unit:
DAMOP
Chair: Linda Reichl, University of Texas at Austin
Abstract: TT06.00007 : Nonlinearity and temperature dependence of drive-induced shifts in a thermal environment*
4:42 PM–4:54 PM
Presenter:
Arpan Chatterjee
(IISER Kolkata)
Authors:
Arpan Chatterjee
(IISER Kolkata)
Rangeet Bhattacharyya
(Indian Institute of Science Education and Research Kolkata)
spectroscopies. These shifts are experimentally known to show dispersive Lorentzian behavior as a function
of its characteristic frequencies in optical pumping experiments. However, the drive-induced Stark shifts,
as calculated using Floquet or dressed atom approaches, does not show the above nonlinear behavior. To this
end, we theoretically investigated the drive-induced shifts using a previously reported
fluctuation-regulated quantum master equation [A. Chakrabarti and R. Â Bhattacharyya, Phys. Rev. A 97, 063837
(2018)]. The shifts are obtained as closed-form expressions over the entire detuning range of the drive. The
predicted shifts match satisfactorily with the known experimental data of the light shifts. We shall show that the
calculated shifts are Kramers-Kronig pair of the drive-induced dissipation in conformity with experimental
findings. Moreover, we also show that at low temperatures, i.e., for less thermal fluctuations, our results
asymptotically match with the known theoretical form of the shifts. In the high-temperature regime, we
predict that the shifts decrease in magnitude and are inversely proportional to the square of the
temperature.
*Arpan chatterjee thanks the University Grants Commission (India) for supporting this work.
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