TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.18.3.111
TI  - Hierarchy of degenerate stationary states in a boundary-driven dipole-conserving spin chain
PY  - 2025/03/27
UR  - https://scipost.org/SciPostPhys.18.3.111
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 18
IS  - 3
SP  - 111
A1  - Srivastava, Apoorv
AU  - Dutta, Shovan
AB  - Kinetically constrained spin chains serve as a prototype for structured ergodicity breaking in isolated quantum systems. We show that such a system exhibits a hierarchy of degenerate steady states when driven by incoherent pump and loss at the boundary. By tuning the relative pump and loss and how local the constraints are, one can stabilize mixed steady states, noiseless subsystems, and various decoherence-free subspaces, all of which preserve large amounts of information. We also find that a dipole-conserving bulk suppresses current in steady state. These exact results based on the flow in Hilbert space hold regardless of the specific Hamiltonian or drive mechanism. Our findings show that a competition of kinetic constraints and local drives can induce different forms of ergodicity breaking in open systems, which should be accessible in quantum simulators.
ER  -

@Article{10.21468/SciPostPhys.18.3.111,
	title={{Hierarchy of degenerate stationary states in a boundary-driven dipole-conserving spin chain}},
	author={Apoorv Srivastava and Shovan Dutta},
	journal={SciPost Phys.},
	volume={18},
	pages={111},
	year={2025},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.18.3.111},
	url={https://scipost.org/10.21468/SciPostPhys.18.3.111},
}