期刊
PHYSICAL REVIEW RESEARCH
卷 2, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.022005
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) [RO2265/5-1]
- DFG [WE/3649/4-2, FOR 1807, RTG 1995, JA2306/4-1, 411750675, SFB 1143, 247310070, 277146847 - SFB 1238]
- Wurzburg-Dresden Cluster of Excellence ct.qmat [EXC 2147, 390858490]
We consider interacting (2+1)-dimensional Dirac fermions with competing symmetry-breaking electronic instabilities, as described by relativistic quantum field theories of the Gross-Neveu-Yukawa flavor with anti-commuting mass terms. We demonstrate, using a combination of nonperturbative field-theoretical analysis and an adapted quantum Monte Carlo approach, that such systems exhibit a strong-coupling quantum multicritical fixed point with an emerging enhanced symmetry. Moreover, an extended phase coexistence regime expands out from this high-symmetry point. Our results disagree with recent results on the presence of a deconfined quantum criticality in (2+1)-dimensional Dirac fermions for the particular case of O(3) Neel and Z(2) Kekule symmetry-breaking instabilities on the graphene lattice. The robustness of these phenomena with respect to the microscopic symmetries furthermore demonstrates their relevance for a wide range of Dirac materials of current interest, from both theory and ongoing experiments.
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