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Superdiffusion from Emergent Classical Solitons in Quantum Spin Chains

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4]
  1. Univ. of Ghent (Belgium); UMass Amherst
  2. CUNY College of Staten Island, Staten Island, NY (United States); CUNY, NY (United States)
  3. Univ. of Ljubljana (Slovenia)
  4. Univ. of Massachusetts, Amherst, MA (United States)

Finite-temperature spin transport in the quantum Heisenberg spin chain is known to be superdiffusive, and has been conjectured to lie in the Kardar-Parisi-Zhang (KPZ) universality class. Using a kinetic theory of transport, we compute the KPZ coupling strength for the Heisenberg chain as a function of temperature, directly from microscopics; the results agree well with density-matrix renormalization group simulations. Here, we establish a rigorous quantum-classical correspondence between the “giant quasiparticles” that govern superdiffusion and solitons in the classical continuous Landau-Lifshitz ferromagnet. We conclude that KPZ universality has the same origin in classical and quantum integrable isotropic magnets: a finite-temperature gas of low-energy classical solitons.

Research Organization:
Univ. of Massachusetts, Amherst, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; NSF
Grant/Contract Number:
SC0019168
OSTI ID:
1647653
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 125; ISSN 1079-7114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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