Quantum Monte Carlo simulations of thermodynamic properties of attractive SU(3) Dirac fermions
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
---|---|
Article number | 165102 |
Journal / Publication | Physical Review B |
Volume | 108 |
Issue number | 16 |
Online published | 2 Oct 2023 |
Publication status | Published - 15 Oct 2023 |
Link(s)
DOI | DOI |
---|---|
Attachment(s) | Documents
Publisher's Copyright Statement
|
Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85174003502&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(4eb0233b-d952-4c58-892d-d35bfed3fd27).html |
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.
In: Physical Review B, Vol. 108, No. 16, 165102, 15.10.2023.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Download Statistics
No data available