Charge density wave order on a $$\textit{π}$$-flux square lattice
Journal Article
·
· Physical Review B
- Univ. of California, Davis, CA (United States); OSTI
- Beihang University, Beijing (China)
- Univ. of California, Davis, CA (United States)
The effect of electron-phonon coupling on Dirac fermions was recently explored numerically on a honeycomb lattice, leading to precise quantitative values for the finite temperature and quantum critical points. In this paper, we use the unbiased determinant quantum Monte Carlo method to study the Holstein model on a half-filled staggered-flux square lattice and compare the results with the honeycomb lattice geometry, presenting results for a range of phonon frequencies 0.1 ≤ $$\omega$$ ≤ 2.0. In this work, we find that the interactions give rise to charge density wave order, but only above a finite coupling strength $$\gamma_{\text{crit}}$$. The transition temperature is evaluated and presented in a $$T_{c^{–λ}}$$ phase diagram. An accompanying mean-field theory calculation also predicts the existence of a quantum phase transition, but at a substantially smaller coupling strength.
- Research Organization:
- Univ. of California, Davis, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0014671
- OSTI ID:
- 1802701
- Journal Information:
- Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 101; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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