Fractionalizing glide reflections in two-dimensional topologically ordered phases

Journal article

We study the fractionalization of space group symmetries in two-dimensional topologically ordered phases. Specifically, we focus on Z2-fractionalized phases in two dimensions whose deconfined topological excitations transform trivially under translational symmetries but projectively under glide reflections, whose quantum numbers are hence fractionalized. We accomplish this by generalizing the dichotomy between even and odd gauge theories to incorporate additional symmetries inherent to nonsymmorphic crystals. We show that the resulting fractionalization of point group quantum numbers can be detected in numerical studies of ground state wave functions. We illustrate these ideas using a microscopic model of a system of bosons at integer unit cell filling on a lattice with space group p4g that can be mapped to a half-magnetization plateau for an S=1/2 spin system on the Shastry-Sutherland lattice.

Authors: Lee, S; Hermele, M; Parameswaran, S

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review B
• Publication date: 2016-09-13
• Acceptance date: 2016-01-01
• DOI: 10.1103/PhysRevB.94.125122
• ISSN: 2469-9950 and 2469-9969
• Keywords: Journal Article