Speaker
Ms
Marta Brzezińska
(Department of Theoretical Physics, Wrocław University of Science and Technology; Department of Physics, University of Zurich )
Description
We investigate two-dimensional spinful bulk insulating phases of matter that are protected by time-reversal and crystalline symmetries. In order to characterize these systems, we use the concept of corner charge fractionalization and show that charges are both quantized and remain stable as long as all symmetries are preserved. To define the topology, we employ symmetry indicators and Wilson loop invariants. We illustrate our results using the example of arsenic and antimony monolayers. Depending on the degree of structural buckling these materials can exhibit two distinct obstructed atomic limits. We present tight-binding and density functional theory calculations for open flakes to support our findings.
Authors
Mr
Frank Schindler
(Department of Physics, University of Zurich; Kavli Institute for Theoretical Physics, University of California)
Ms
Marta Brzezińska
(Department of Theoretical Physics, Wrocław University of Science and Technology; Department of Physics, University of Zurich )
Dr
Wladimir Benalcazar
(Physics Department, Pennsylvania State University)
Mr
Mikel Iraola
(Donostia International Physics Center)
Dr
Adrien Bouhon
(Department of Physics and Astronomy, Uppsala University; NORDITA)
Dr
Stepan Tsirkin
(Department of Physics, University of Zurich)
Dr
Maia Vergniory
(Donostia International Physics Center; IKERBASQUE, Basque Foundation for Science)
Prof.
Titus Neupert
(Department of Physics, University of Zurich)
