Monitored fermions with conserved U(1) charge
Physical Review Research American Physical Society (APS) 6:4 (2024) 043246
Worldsheet patching, 1-form symmetries, and Landau* phase transitions
Physical Review B American Physical Society (APS) 110:11 (2024) 115102
Heisenberg spin chain with random-sign couplings.
Proceedings of the National Academy of Sciences of the United States of America 121:36 (2024) e2401292121
Abstract:
We study the 1D quantum Heisenberg chain with randomly ferromagnetic or antiferromagnetic couplings [a model previously studied by approximate strong-disorder renormalization group (RG)]. We find that, at least for sufficiently large spin S, the ground state has "spin glass" order. The spin waves on top of this state have the dynamical exponent [Formula: see text], intermediate between the values z = 1 of the antiferromagnet and z = 2 of the ferromagnet. Density matrix renormalization group (DMRG) simulations are in good agreement with the analytical results for spins S = 1 and [Formula: see text]. The case [Formula: see text] shows large finite size effects: We suggest that this case is also ordered, but with a small ordered moment.Nonlinear Sigma Models for Monitored Dynamics of Free Fermions
Physical Review X American Physical Society (APS) 13:4 (2023) 041045