Spin-triplet $f$-wave pairing in twisted bilayer graphene near $\frac{1}{4}$-filling

Spin-triplet $f$ -wave pairing in twisted bilayer graphene near $\frac{1}{4}$ -filling

Qing-Kun Tang, Lin Yang, Da Wang, Fu-Chun Zhang, and Qiang-Hua Wang

Phys. Rev. B 99, 094521 – Published 29 March 2019

Abstract

We investigate the twisted bilayer graphene by a two-orbital Hubbard model on the honeycomb lattice. The model is studied near $\frac{1}{4}$ -band-filling by using the singular-mode functional renormalization group theory. Spin-triplet $f$ -wave pairing is found from weak to moderate coupling limit of the local interactions, and is associated with the Hund's rule coupling and incommensurate spin fluctuations at moderate momenta.

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Received 18 September 2018
Revised 18 February 2019

DOI:https://doi.org/10.1103/PhysRevB.99.094521

Physics Subject Headings (PhySH)

Multiband superconductivity Pairing mechanisms Spin-triplet pairing Superconducting gap

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Qing-Kun Tang¹, Lin Yang¹, Da Wang¹, Fu-Chun Zhang^2,3, and Qiang-Hua Wang^1,3,*

¹National Laboratory of Solid State Microstructures & School of Physics, Nanjing University, Nanjing, 210093, China
²Kavli Institute for Theoretical Sciences & CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
³Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China

^*qhwang@nju.edu.cn

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Vol. 99, Iss. 9 — 1 March 2019

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