Abstract
We demonstrate a generalized notion of eigenstate thermalization for translation-invariant quasifree fermionic models: the vast majority of eigenstates satisfying a finite number of suitable constraints (e.g., fixed energy and particle number) have the property that their reduced density matrix on small subsystems approximates the corresponding generalized Gibbs ensemble. To this end, we generalize analytic results by H. Lai and K. Yang [Phys. Rev. B 91, 081110(R) (2015)] and illustrate the claim numerically by example of the Jordan-Wigner transform of the XX spin chain.
3 More- Received 19 October 2017
- Revised 3 January 2018
DOI:https://doi.org/10.1103/PhysRevB.97.035129
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