Bulk Entanglement Spectrum Reveals Quantum Criticality within a Topological State
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PhysRevLett.113.106801.pdf
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210.21 KB
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Adobe PDF
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Author(s)
Fu, Liang
Hsieh, Timothy Hwa-wei
Date Issued
September 2014
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Hsieh, Timothy H., and Liang Fu. "Bulk Entanglement Spectrum Reveals Quantum Criticality within a Topological State." Phys. Rev. Lett. 113, 106801 (September 2014). © 2014 American Physical Society
Version
Final published version
Abstract
A quantum phase transition is usually achieved by tuning physical parameters in a Hamiltonian at zero temperature. Here, we show that the ground state of a topological phase itself encodes critical properties of its transition to a trivial phase. To extract this information, we introduce an extensive partition of the system into two subsystems both of which extend throughout the bulk in all directions. The resulting bulk entanglement spectrum has a low-lying part that resembles the excitation spectrum of a bulk Hamiltonian, which allows us to probe a topological phase transition from a single wave function by tuning either the geometry of the partition or the entanglement temperature. As an example, this remarkable correspondence between the topological phase transition and the entanglement criticality is rigorously established for integer quantum Hall states.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.113.106801
