Velocity-sorting and stochastic resonances in a dissipative optical lattice

Presenting Author: Alexander Staron, Miami University
Contributing Author(s): Kefeng Jiang, Ajithamithra Dharmasiri, Anthony Rapp, and Samir Bali

We present detailed pump-probe spectra depicting Zeeman light-shifts, Raman vibrational modes, and velocity-selective Brillouin propagation modes in a dissipative optical lattice which agree with predictions from a simple F = 1/2 --> F’ = 3/2 atomic model. Depending on the incident angle of the probe beam, specific velocity classes of atoms are ratcheted in different directions. For the first time via direct pump-probe spectroscopy, we explore the possibility of observing a classical stochastic resonance in an optical lattice, where environmental fluctuations in the form of random spontaneous emission recoils are coupled to the atomic system to yield enhanced ratcheting. Further, we discuss prospects for inserting sharp, sub-wavelength potential barriers into the lattice potentials using recent dark state wavefunction engineering methods [M. Lacki, et al., Phys. Rev. Lett. 117, 233001 (2016); Y. Wang, et al., Phys. Rev. Lett. 120, 083601 (2018)]. By inducing quantum tunneling across these narrow barriers we seek to explore the possibility of observing quantum stochastic resonances in optical lattices.

(Session 5 : Saturday from 5:00pm - 7:00pm)


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