Condensed Matter Theory Seminar - LSU
Authors: J. A. Sauls
Where: Department of Physics & Astronomy,
Louisiana State University, Baton Rouge, LA
March 26, 2024
Abstract: Broken symmetries and emergent topology in condensed matter systems have implications for the spectrum of Fermionic excitations confined on surfaces or topological defects. The Fermionic spectrum of confined (quasi-2D) ^{3}He-A consists of branches of massless chiral Fermions confined on a boundary. The negative energy states determine the ground-state edge current and angular momentum, L_{z} = (N/2) ħ, for a macroscopic system of N/2 Fermion paires. I discuss the effects of wave function overlap, and hybridization between edge states confined near opposing surfaces. Under sufficiently strong confinement, a chiral superfluid/superconductor undergoes a sequence of phase transitions, including a pair density wave (PDW) phase that spontaneously breaks translational symmetry. The PDW phase that forms is a periodic array of chiral domains with alternating chirality, separated by domain walls that form a soliton lattice. The PDW phase is driven by the competition between the edge states and a new branch of chiral fermions bound to the domain walls.
This research was supported by NSF Grant: DMR-1508730
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