Extracting Boundary Conformal Data from Periodic Non-Hermitian Critical Chains (opens in new tab)

Boundary conformal field theory (BCFT) contains universal data that are usually accessed microscopically by imposing spatial boundaries on the lattice. Here, we introduce a periodic-chain projected-partition-function spectroscopy that extracts universal boundary quantities directly from non-Hermitian bulk-critical quantum chains, avoiding the need to engineer microscopic open boundaries and circumventing subtle boundary effects in non-Hermitian ...