Kavli Affiliate: Joel E. Moore
| First 5 Authors: Siddharth Tiwary, Siddharth Tiwary, , ,
| Summary:
Spin chains with quenched disorder exhibit rich critical behavior, often
captured by real-space renormalization group (RSRG) techniques. However, the
physics of such systems in the presence of random measurements (i.e.,
non-Hermitian dephasing) remains largely unexplored. The interplay between
measurements and unitary dynamics gives rise to novel phases and phase
transitions in monitored quantum systems. In this work, we investigate the
disordered XX spin chain subject to stochastic local measurements in the $X$
and $Y$ bases. By mapping the monitored chain to a non-Hermitian spin ladder
with complex couplings, we propose an RSRG-for-excited-states (RSRG-X) approach
for this open-system setting. Our analysis reveals a new class of strongly
disordered fixed points that emerge due to non-unitarity, broadening the
landscape of critical phenomena accessible via RSRG.
| Search Query: ArXiv Query: search_query=au:”Joel E. Moore”&id_list=&start=0&max_results=3