3 papers
quant-ph2026
Continuous time crystals as a PT symmetric state and the emergence of critical exceptional points
Yuma Nakanishi, Ryo Hanai, Tomohiro Sasamoto
Continuous time-translation symmetry is often spontaneously broken in open quantum systems, and the condition for their emergence has been actively investigated. However, there are…
cond-mat.stat-mech2026
Integral formula for the propagator of the one-dimensional Hubbard model
Taiki Ishiyama, Kazuya Fujimoto, Tomohiro Sasamoto
We present an exact integral formula for the multi-particle propagator of the one-dimensional Fermi--Hubbard model on an infinite lattice. The proof is based on the nested Bethe an…
quant-ph2025
Lindbladian PT phase transitions
Yuma Nakanishi, Tomohiro Sasamoto
A parity-time (PT) transition is a spectral transition characteristic of non-Hermitian generators; it typically occurs at an exceptional point, where multiple eigenvectors coalesce…