Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8341
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Funding
- ISF
- Minerva foundation
- ERC under the UQUAM project
- NSF GRFP [DGE 1106400]
- NSF [DMR 1206728]
- Simons Fellowship
- Aspen Center for Physics under NSF [1066293]
- Direct For Mathematical & Physical Scien [1206728] Funding Source: National Science Foundation
- Division Of Materials Research [1206728] Funding Source: National Science Foundation
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Topological phases are characterized by edge states confined near the boundaries by a bulk energy gap. On raising temperature, these edge states are typically lost due to mobile thermal excitations. However, disorder can localize an isolated many-body system, potentially allowing for a sharply defined topological phase even in a highly excited state. We explicitly demonstrate this in a model of a disordered, one-dimensional magnet with spin one-half edge excitations. Furthermore, we show that the time evolution of a simple, highly excited state reveals quantum coherent edge spins. In particular, we demonstrate the coherent revival of an edge spin over a time scale that grows exponentially with system size. This is in sharp contrast to the general expectation that quantum bits strongly coupled with a hot many-body system will rapidly lose coherence. This result opens new directions in the study of topologically protected quantum dynamics.
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