209 citations · 1.7k across the 43 of their papers we have counts for
42 papers
Quantised Bulk Conductivity as a Local Chern Marker
Peru d'Ornellas, Ryan Barnett, Derek K. K. Lee
A central property of Chern insulators is the robustness of the topological phase and edge states to impurities in the system. Despite this, Chern number cannot be straightforwardl…
1D quasicrystals and topological markers
Joseph Sykes, Ryan Barnett
Local topological markers are effective tools for determining the topological properties of both homogeneous and inhomogeneous systems. The Chern marker is an established topologic…
The effect of boson-boson interaction on the Bipolaron formation
Jonas Jager, Ryan Barnett
Impurities immersed into a surrounding ultra-cold Bose gas experience interactions mediated by the surrounding many-body environment. If one focuses on two impurities that are suff…
Stochastic-field approach to the quench dynamics of the one-dimensional Bose polaron
Jonas Jager, Ryan Barnett
We consider the dynamics of a quantum impurity after a sudden interaction quench into a one-dimensional degenerate Bose gas. We use the Keldysh path integral formalism to derive a…
Local Topological Markers in Odd Dimensions
Joseph Sykes, Ryan Barnett
Local topological markers have proven to be a valuable tool for investigating systems with topologically non-trivial bands. Due to their local nature, such markers can treat transl…
Strong-coupling Bose polarons in 1D: Condensate deformation and modified Bogoliubov phonons
Jonas Jager, Ryan Barnett, Martin Will +1
We discuss the interaction of a quantum impurity with a one-dimensional degenerate Bose gas forming a Bose-polaron. In three spatial dimensions the quasiparticle is typically well…