Quantum many-body scars from virtual entangled pairs
| Autor: | Mikhail D. Lukin, Hannes Pichler, Sambuddha Chattopadhyay, Wen Wei Ho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Quantum Physics Statistical Mechanics (cond-mat.stat-mech) Strongly Correlated Electrons (cond-mat.str-el) Chaotic Degrees of freedom (physics and chemistry) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Many body Condensed Matter - Strongly Correlated Electrons Classical mechanics 0103 physical sciences Rydberg atom Mathematics::Metric Geometry 010306 general physics 0210 nano-technology Quantum Physics (quant-ph) Phenomenology (particle physics) Quantum Condensed Matter - Statistical Mechanics |
| Popis: | We study weak ergodicity breaking in a one-dimensional, nonintegrable spin-1 XY model. We construct for it an exact, highly excited eigenstate, which despite its large energy density, can be represented analytically by a finite bond-dimension matrix product state (MPS) with area-law entanglement. Upon a quench to a finite Zeeman field, the state undergoes periodic dynamics with perfect many-body revivals, in stark contrast to other generic initial states which instead rapidly thermalize. This dynamics can be completely understood in terms of the evolution of entangled virtual spin-1/2 degrees of freedom, which in turn underpin the presence of an extensive tower of strong-eigenstate thermalization hypothesis (ETH)-violating many-body eigenstates. The resulting quantum many-body scars are therefore of novel origin. Our results provide important analytical insights into the nature and entanglement structure of quantum many-body scars. Comment: 7 + 9 pages |
| Databáze: | OpenAIRE |
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