Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Feshbach-enhanced odd- and even-wave interactions between identical fermions in quasi-one-dimensional confinement

Jul 20, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Degenerate gases, many-body physics, and quantum simulation Poster session


Spin-polarized Fermi gases in low dimensions offer a pathway to the quantum simulation of matter. Through a Feshbach mechanism the p-wave ($L=1$) interactions governing these systems, which are suppressed by a centrifugal barrier at low energy, may be tuned and enhanced by a magnetic field. In doing so one may realize phenomena as diverse as chiral superfluidity in two dimensions to topological qubits in the form of Majorana fermions in a Kitaev chain in one dimension. We study the short-range correlations between atoms in an ensemble of quasi-one-dimensional (quasi-1D) tubes of fermionic potassium realized with a two-dimensional optical lattice. The p-wave contact in 1D is measured for the first time through few-body correlations that manifest in the high-momentum tail of radio-frequency spectroscopy. By varying magnetic field and lattice depth we observe that the odd-wave resonance is shifted by confinement, energetically narrow, and limited from reaching unitarity by loss. In a greater field range, we observe additional features due to orbital singlet collisional states facilitated by population in transverse excited bands. Such states are exchange anti-symmetric in the transverse confinement direction, resulting in axial even-wave character that exhibits broad energetic width and orders of magnitude larger correlation strength than the odd-wave case. These emergent even-wave collisions open new possibilities for strongly interacting p-wave systems and quantum simulation in low dimensions.

Presenter name Kevin G. S. Xie
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Primary authors

Kevin G. S. Xie (University of Toronto) Kenneth G. Jackson (University of Toronto) Colin J. Dale (University of Toronto) Ben A. Olsen (Yale-NUS College) Jeff Maki (The University of Hong Kong) Shizhong Zhang (The University of Hong Kong) Joseph H. Thywissen (University of Toronto)

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