@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)], to a bichromatic 1D lattice with finite 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} }
 @article{cheng_kangara_arakelyan_thomas_2016, title={Fermi gases in the two-dimensional to quasi-two-dimensional crossover}, volume={94}, ISSN={["2469-9934"]}, DOI={10.1103/physreva.94.031606}, abstractNote={We tune the dimensionality of pancake-shaped strongly-interacting $^6$Li Fermi gas clouds from two-dimensional (2D) to quasi-2D, by controlling the ratio of the radial Fermi energy $E_F$ to the harmonic oscillator energy $h\nu_z$ in the tightly confined direction. In the 2D regime, where $E_F<<h\nu_z$, the measured radio frequency resonance spectra are in agreement with 2D-BCS theory. In the quasi-2D regime, where $E_F\simeq h\nu_z$, the measured spectra deviate significantly from 2D-BCS theory. For both regimes, the measured cloud radii disagree with 2D-BCS mean field theory, but agree approximately with predictions using a free energy derived from the Bethe-Goldstone equation.}, number={3}, journal={PHYSICAL REVIEW A}, author={Cheng, Chingyun and Kangara, J. and Arakelyan, I. and Thomas, J. E.}, year={2016}, month={Sep} }