@article{pegahan_arakelyan_thomas_2021, title={Energy-Resolved Information Scrambling in Energy-Space Lattices}, volume={126}, ISSN={["1079-7114"]}, url={https://doi.org/10.1103/PhysRevLett.126.070601}, DOI={10.1103/PhysRevLett.126.070601}, abstractNote={Weakly interacting Fermi gases simulate spin lattices in energy space, offering a rich platform for investigating information spreading and spin coherence in a large many-body quantum system. We show that the collective spin vector can be determined as a function of energy from the measured spin density, enabling general energy-space resolved protocols. We measure an out-of-time-order correlation function in this system and observe the energy dependence of the many-body coherence.}, number={7}, journal={PHYSICAL REVIEW LETTERS}, author={Pegahan, S. and Arakelyan, I and Thomas, J. E.}, year={2021}, month={Feb} }
 @article{pegahan_kangara_arakelyan_thomas_2019, title={Spin-energy correlation in degenerate weakly interacting Fermi gases}, volume={99}, ISSN={["2469-9934"]}, DOI={10.1103/PhysRevA.99.063620}, abstractNote={Weakly interacting Fermi gases exhibit rich collective dynamics in spin-dependent potentials, arising from correlations between spin degrees of freedom and conserved single atom energies, offering broad prospects for simulating many-body quantum systems by engineering energy-space "lattices," with controlled energy landscapes and site to site interactions. Using quantum degenerate clouds of $^6$Li, confined in a spin-dependent harmonic potential, we measure complex, time-dependent spin-density profiles, varying on length scales much smaller than the cloud size. We show that a one-dimensional mean field model, without additional simplifying approximations, quantitatively predicts the observed fine structure. We measure the magnetic fields where the scattering lengths vanish for three different hyperfine state mixtures to provide new constraints on the collisional (Feshbach) resonance parameters.}, number={6}, journal={PHYSICAL REVIEW A}, author={Pegahan, S. and Kangara, J. and Arakelyan, I and Thomas, J. E.}, year={2019}, month={Jun} }
 @article{kangara_cheng_pegahan_arakelyan_thomas_2018, title={Atom Pairing in Optical Superlattices}, volume={120}, ISSN={["1079-7114"]}, DOI={10.1103/physrevlett.120.083203}, abstractNote={We study the pairing of fermions in a one-dimensional lattice of tunable double-well potentials using radio-frequency spectroscopy. The spectra reveal the coexistence of two types of atom pairs with different symmetries. Our measurements are in excellent quantitative agreement with a theoretical model, obtained by extending the Green's function method of Orso et al. [Phys. Rev. Lett. 95, 060402 (2005)PRLTAO0031-900710.1103/PhysRevLett.95.060402] to a bichromatic 1D lattice with nonzero harmonic radial confinement. The predicted spectra comprise hundreds of discrete transitions, with symmetry-dependent initial state populations and transition strengths. Our work provides an understanding of the elementary pairing states in a superlattice, paving the way for new studies of strongly interacting many-body systems.}, number={8}, journal={PHYSICAL REVIEW LETTERS}, author={Kangara, J. and Cheng, Chingyun and Pegahan, S. and Arakelyan, I. and Thomas, J. E.}, year={2018}, month={Feb} }