Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Nonequilibrium Quantum Many-Body Systems 1 (joint session TT/DY)

TT 23.9: Vortrag

Dienstag, 17. März 2020, 11:45–12:00, HSZ 204

η-pairing in one-dimensional Mott insulators — •Satoshi Ejima1, Tatsuya Kaneko2, Florian Lange1, Seiji Yunoki3,4,5, and Holger Fehske11Institute of Physics, University Greifswald, Greifswald, Germany — 2Department of Physics, Columbia University, New York NY, USA — 3RIKEN Cluster for Pioneering Research, Wako, Japan — 4RIKEN Center for Emergent Matter Science, Wako, Japan — 5RIKEN Center for Computational Science, Kobe, Japan

Very recently, it was theoretically demonstrated that unconventional superconductivity correlation can be induced by pulse irradiation in the simple Mott insulator of the half-filled Hubbard model [1]. This superconducting-like state stems from the so-called η-pairing mechanism, characterized by staggered pair-density-wave oscillations of the off-diagonal correlations.

In this study, we first explore precisely under which conditions the η-pairing state appears most pronouncedly at zero temperature by means of the time-dependent density-matrix renormalization group (DMRG) method in the matrix-product-state representation. Carrying out temperature-dependent DMRG in combination with the purification technique, we furthermore prove whether this state can survive at finite temperatures, in order to check the possible experimental observation of the pairing state, e.g., in optical lattices.

[1] T. Kaneko, T. Shirakawa, S. Sorella and S. Yunoki, Phys. Rev. Lett. 122, 077002 (2019).

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