Oct 22: William Cody Burton on “Observation of Bose-Einstein Condensation in a Strong Synthetic Magnetic Field”

Title: Observation of Bose-Einstein Condensation in a Strong Synthetic Magnetic Field
Location: 26-214, Thursday Oct 22 Noon-1pm. Pizza at 11:45!
(Feel free to bring your own cup and plate)

Abstract: The study of topological states of matter is an active frontier in physics. Much of the research with ultracold atoms has focused on the paradigmatic Harper-Hofstadter Hamiltonian, which describes charged particles in a lattice with a strong homogeneous magnetic field, whose single-particle spectrum is given by Hofstadter‘s butterfly and whose sub-bands exhibit non-zero Chern numbers and Dirac points. We present the first observation of Bose-Einstein condensation and superfluidity in Hofstadter’s butterfly. Ballistic expansion reveals the gauge-dependent wavefunction and ground state degeneracy for the field chosen. Finally, we discuss potential heating mechanisms and a method to compensate for shot-noise-induced dephasing.

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–Jeffrey H. Shapiro, Co-Director, iQuISE, and Julius A. Stratton Professor of Electrical Engineering and Director, Research Laboratory of Electronics