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- W3214522435 abstract "Abstract The dynamics of a hole motion in a quantum antiferromagnet has been studied in the past three decades because of its relationship to models related to superconductivity in cuprates. The same problem has received significant attention because of its connection to very recent experiments of the dynamics of ultra-cold atoms in optical lattices where models of strongly correlated electrons can be simulated. In this paper we apply the diagrammatic Monte Carlo method to calculate the single-hole Green’s function in the t – J model, where the J term is linearized, in a wide range of imaginary-time with the aim to examine the polaron formation and in particular the details of the contribution of the so-called string excitations found in such recent experiments. We calculate the single-hole spectral function by analytic continuation from imaginary to real time and study the various aspects that constitute the string picture, such as, the energy–momentum dependence of the main quasiparticle peak and its residue, the internal excitations of the string which appear as multiple peaks in the spectral function as well as their momentum dependence. We find that the earlier analysis of the spectral function based on a mobile-hole connected with a string of overturn spins and the contribution of the internal string excitations as obtained from the non-crossing approximation is accurate." @default.
- W3214522435 created "2021-11-22" @default.
- W3214522435 creator A5069756772 @default.
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- W3214522435 date "2021-12-01" @default.
- W3214522435 modified "2023-10-15" @default.
- W3214522435 title "Dynamics of string-like states of a hole in a quantum antiferromagnet: a diagrammatic Monte Carlo simulation" @default.
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- W3214522435 doi "https://doi.org/10.1088/1367-2630/ac39b5" @default.
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