Quasiparticle metamorphosis in the random t-J model
| Autor: | Kumar, Aman, Sachdev, Subir, Tripathi, Vikram |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Physical Review B 106, L081120 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.106.L081120 |
| Popis: | Motivated by the pseudogap-Fermi liquid transition in doped Mott insulators, we examine the excitations of a $t$-$J$ model with random and all-to-all hopping and exchange. The stability of quasiparticles such as spin-1/2 fermions, spin-1 magnons, and emergent Jordan-Wigner (JW) spinless fermions is cast as a problem of localization in the many-body Hilbert space, which is studied by the FEAST eigensolver algorithm. At low dopings, magnons and JW fermions are better defined than spin-1/2 fermions, which are unstable. Upon crossing a critical value of doping around $p_c$ = 1/3, their stabilities are interchanged. Near the critical doping, these quasiparticles are all found to be ill-defined. The critical point is thus associated with a localization transition in the many-body Hilbert space Comment: 7 pages, 6 figures |
| Databáze: | arXiv |
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