11 papers
Temporal Localisation of Waves from Imaginary Line-Gap Topology
Carlos Camacho, Tom Sheppard, Joshua Feis +4
For non-Hermitian Hamiltonians, gain, loss, and non-reciprocity produce complex eigenvalues which, in turn, facilitate different kinds of topological phases. One example is the ima…
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…
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…
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 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…