Quantum Monte Carlo simulations of thermodynamic properties of attractive SU(3) Dirac fermions

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Xiang Li
  • Han Xu
  • Yu Wang

Detail(s)

Original languageEnglish
Article number165102
Journal / PublicationPhysical Review B
Volume108
Issue number16
Online published2 Oct 2023
Publication statusPublished - 15 Oct 2023

Link(s)

Abstract

We employ the determinant quantum Monte Carlo method to study the finite-temperature properties of the half-filled attractive SU(3) Hubbard model on a honeycomb lattice. We calculate the phase diagram in which the phase boundary separates the disordered phase and the charge density wave (CDW) phase and the transition temperature Ttr(|U|) varies nonmonotonically with attractive Hubbard interaction |U|. As the Hubbard |U| increases at constant temperature T < max(Ttr(|U|)), the system first undergoes a transition from thermal Dirac semimetal phase to CDW phase, and eventually the CDW state is thermally melted at a strong Hubbard |U| where the system enters a trion liquid phase. In between the two transition points the nonmonotonic |U| dependence of CDW order strength is strikingly different from the zero-temperature monotonic behavior. In the trion CDW state where off-site trions arise from quantum fluctuations (a fermion inside an on-site trion hops to a nearest-neighbor site), the simulated triple occupancy at constant Hubbard |U| surprisingly increases with temperature, implying that the formation of off-site trions is suppressed by the thermal delocalization of on-site trions. We have also calculated the entropy-temperature relations for various attractive Hubbrad interactions, which exhibit the prominent characteristic of the Pomeranchuk effect. Our work has revealed that the formation of on-site and off-site trions has significant consequences for thermodynamic properties of SU(3) Dirac fermions. © 2023 American Physical Society.

Research Area(s)

Citation Format(s)

Quantum Monte Carlo simulations of thermodynamic properties of attractive SU(3) Dirac fermions. / Li, Xiang; Xu, Han; Wang, Yu.
In: Physical Review B, Vol. 108, No. 16, 165102, 15.10.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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