@article{ong_cheng_arakelyan_thomas_2015, title={Spin-Imbalanced Quasi-Two-Dimensional Fermi Gases}, volume={114}, ISSN={["1079-7114"]}, DOI={10.1103/physrevlett.114.110403}, abstractNote={We measure the density profiles for a Fermi gas of (6)Li containing N(1) spin-up atoms and N(2) spin-down atoms, confined in a quasi-two-dimensional geometry. The spatial profiles are measured as a function of spin imbalance N(2)/N(1) and interaction strength, which is controlled by means of a collisional (Feshbach) resonance. The measured cloud radii and central densities are in disagreement with mean-field Bardeen-Cooper-Schrieffer theory for a true two-dimensional system. We find that the data for normal-fluid mixtures are reasonably well fit by a simple two-dimensional polaron model of the free energy. Not predicted by the model is a phase transition to a spin-balanced central core, which is observed above a critical value of N(2)/N(1). Our observations provide important benchmarks for predictions of the phase structure of quasi-two-dimensional Fermi gases.}, number={11}, journal={PHYSICAL REVIEW LETTERS}, author={Ong, W. and Cheng, Chingyun and Arakelyan, I. and Thomas, J. E.}, year={2015}, month={Mar} }
 @article{zhang_ong_arakelyan_thomas_2012, title={Polaron-to-Polaron Transitions in the Radio-Frequency Spectrum of a Quasi-Two-Dimensional Fermi Gas}, volume={108}, ISSN={["0031-9007"]}, DOI={10.1103/physrevlett.108.235302}, abstractNote={We measure radio-frequency spectra for a two-component mixture of a 6Li atomic Fermi gas in a quasi-two-dimensional regime with the Fermi energy comparable to the energy level spacing in the tightly confining potential. Near the Feshbach resonance, we find that the observed resonances do not correspond to transitions between confinement-induced dimers. The spectral shifts can be fit by assuming transitions between noninteracting polaron states in two dimensions.}, number={23}, journal={PHYSICAL REVIEW LETTERS}, author={Zhang, Y. and Ong, W. and Arakelyan, I. and Thomas, J. E.}, year={2012}, month={Jun} }