2 papers
cond-mat.mes-hall2026
Exact expression for the Berry connection in the projection gauge
Trey Cole, David Vanderbilt
The Berry connection encodes the momentum-space geometry of occupied Bloch states in gapped insulators and plays a central role in topological materials. While gauge-invariant quan…
cond-mat.mes-hall2025
Reduced Wannier representation for topological bands
Trey Cole, David Vanderbilt
Bands with non-trivial topological indices have a topological obstruction preventing them from being represented by exponentially localized Wannier states. Here, we propose a proce…