Universität zu Köln

Gneist, Nico ORCID: 0000-0001-8086-851X, Kiese, Dominik, Henkel, Ravn, Thomale, Ronny, Classen, Laura and Scherer, Michael M. (2022). Functional renormalization of spinless triangular-lattice fermions: N-patch vs. truncated-unity scheme. Eur. Phys. J. B, 95 (9). NEW YORK: SPRINGER. ISSN 1434-6036

Full text not available from this repository.

Abstract

We study competing orders of spinless fermions in the triangular-lattice Hubbard model with nearest-neighbor interaction. We calculate the effective, momentum-resolved two-particle vertex in an unbiased way in terms of the functional renormalization group method and compare two different schemes for the momentum discretization, one based on dividing the Fermi surface into patches and one based on a channel decomposition. We study attractive and repulsive nearest-neighbor interaction and find a competition of pairing and charge instabilities. In the attractive case, a Pomeranchuk instability occurs at Van Hove filling and f-wave and p-wave pairing emerge when the filling is reduced. In the repulsive case, we obtain a charge density wave at Van Hove filling and extended p-wave pairing with reduced filling. The p-wave pairing solution is doubly degenerate and can realize chiral p + ip superconductivity with different Chern numbers in the ground state. We discuss implications for strongly correlated spin-orbit coupled hexagonal electron systems such as moire heterostructures.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Gneist, Nico UNSPECIFIED orcid.org/0000-0001-8086-851X UNSPECIFIED Kiese, Dominik UNSPECIFIED UNSPECIFIED UNSPECIFIED Henkel, Ravn UNSPECIFIED UNSPECIFIED UNSPECIFIED Thomale, Ronny UNSPECIFIED UNSPECIFIED UNSPECIFIED Classen, Laura UNSPECIFIED UNSPECIFIED UNSPECIFIED Scherer, Michael M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-678051
DOI:	10.1140/epjb/s10051-022-00395-w
Journal or Publication Title:	Eur. Phys. J. B
Volume:	95
Number:	9
Date:	2022
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1434-6036
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SUPERCONDUCTIVITY Multiple languages Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67805