8 papers
Topological Localisation in Time from PT Symmetry
Tom Sheppard, C. B. B. Camacho, Sebastian Weidemann +4
Time has entered the domain of topological phases in the field of non-Hermitian physics. Previous studies have relied on periodic modulation in time to make an intuitive connection…
Composite Quantum Geometry and Semiclassical Dynamics
Henry Davenport, Yoonseok Hwang, Johannes Knolle +1
We derive semiclassical equations of motion for general composite bound states in insulators and semiconductors, covering excitations such as excitons and trions. For neutral compo…
Stable Wave-Function Zeros Indicate Exciton Topology
Yoonseok Hwang, Henry Davenport, Frank Schindler
Excitons are bound states of electrons and holes whose band topology arises from an interplay between the topology of the underlying electronic bands and the structure of the elect…
A pedestrian's guide to the topological phases of free fermions
Frank Schindler
These lecture notes explain the classification of some simple fermionic topological phases of matter in a pedestrian manner, with an aim to be maximally pedagogical = doing things…
Topological Dislocation Response in Elementary Semiconductors
Yuteng Zhou, Alexandre Chaduteau, Frank Schindler
We study elementary semiconductors and insulators that are symmetric under spatial inversion: silicon, diamond, germanium, and black phosphorene. These materials are ideal candidat…
Microscopic theory of Chern polarization via crystalline defect charge
Thivan M. Gunawardana, Frank Schindler, Ari M. Turner +1
The modern theory of polarization does not apply in its original form to systems with non-trivial band topology. Chern insulators are one such example. Defining polarization for th…