Olumakinde Ogunnaike

Apr 24, 2024 | link.aps.org | Sophie Fisher |Olumakinde Ogunnaike |Leonid S. Levitov

Motivated by recent cold atom experiments exploring the phase structure of Bose-Fermi mixtures, we propose novel emergent bound states. Cold atoms embedded in a degenerate Fermi system interact via a fermionic analog of the Casimir force, which is an attraction of a −1/r form at distances shorter than the Fermi wavelength.

May 16, 2023 | link.aps.org | Zhiyu Dong |Olumakinde Ogunnaike |Leonid S. Levitov

Abstract We argue that spin- and valley-polarized metallic phases recently observed in graphene bilayers and trilayers support chiral edge modes that allow spin waves to propagate ballistically along system boundaries without backscattering. The chiral edge behavior originates from the interplay between the momentum-space Berry curvature in Dirac bands and the geometric phase of a spin texture in position space.

Feb 3, 2023 | link.aps.org | Zhiyu Dong |Leonid S. Levitov |Margarita Davydova |Olumakinde Ogunnaike

Abstract Electron bands in Bernal bilayer graphene flatten out in a transverse electric field, offering a promising platform for correlated electron physics. We discuss the spin/valley isospin magnetism resembling that seen in moiré bands. We predict that the isospin magnetism coexists with momentum-polarized phases occurring via a “flocking transition” in momentum space in which the electron distribution is spontaneously displaced in momentum space relative to the K and K′ valley centers.