Nonzero angular momentum density wave phases in SU(N) fermions with singlet-bond and triplet-current interactions

Article

关键词: LARGE-N LIMIT;    MOTT INSULATOR;    HUBBARD-MODEL;   

DOI  :  10.1103/PhysRevB.106.195137

来源: SCIE

【 摘 要 】

We employ the sign-problem-free projector determinant quantum Monte Carlo method to study a microscopic model of SU( N) fermions with singlet-bond and triplet-current interactions on the square lattice. We find the gapped singlet px and gapless triplet d(x)(2)- y(2) density wave states in the half-filled N = 4 model. Specifically, the triplet d(x)(2)- y(2) density wave order is observed in the weak triplet-current interaction regime. As the triplet-current interaction strength is further increased, our simulations demonstrate a transition to the singlet px density wave state, accompanied by a gapped mixed-ordered area where the two orders coexist. With increasing the singletbond interaction strength, the triplet d(x)(2)-y(2)-wave order persists up to a critical point after which the singlet px density wave state is stabilized, while the ground state is disordered in between the two ordered phases. The analytical continuation is then performed to derive the single-particle spectrum. In the spectra of triplet dx(2)- y(2) and singlet px density waves, the anisotropic Dirac cone and the parabolic shape around the Dirac point are observed, respectively. As for the mixed-ordered area, a single-particle gap opens and the velocities remain anisotropic at the Dirac point.

【 授权许可】

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