Universität zu Köln

Torres, Emilio, Weber, Lukas ORCID: 0000-0003-4949-5529, Janssen, Lukas ORCID: 0000-0003-4919-796X, Wessel, Stefan and Scherer, Michael M. (2020). Emergent symmetries and coexisting orders in Dirac fermion systems. Phys. Rev. Res., 2 (2). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2643-1564

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Torres, Emilio UNSPECIFIED UNSPECIFIED UNSPECIFIED Weber, Lukas UNSPECIFIED orcid.org/0000-0003-4949-5529 UNSPECIFIED Janssen, Lukas UNSPECIFIED orcid.org/0000-0003-4919-796X UNSPECIFIED Wessel, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Scherer, Michael M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-337334
DOI:	10.1103/PhysRevResearch.2.022005
Journal or Publication Title:	Phys. Rev. Res.
Volume:	2
Number:	2
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2643-1564
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGIC-ANGLE; ELECTRON INTERACTIONS; SUPERCONDUCTIVITY; EXPANSION; INSULATOR Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/33733