Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators

Huang, Yixuan; Gong, Shou-Shu; Sheng, D.  N.

doi:10.1103/physrevlett.130.136003

Title: Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators

Journal Article · Thu Mar 30 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.136003· OSTI ID:1994137

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California State University, Northridge (CSUN), CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Beihang University, Beijing (China)
California State University, Northridge (CSUN), CA (United States)

The topological superconducting state is a highly sought-after quantum state hosting topological order and Majorana excitations. Here, in this Letter, we explore the mechanism to realize the topological superconductivity (TSC) in the doped Mott insulators with time-reversal symmetry (TRS). Through large-scale density matrix renormalization group study of an extended triangular-lattice t–J model on the six- and eight-leg cylinders, we identify a d + id-wave chiral TSC with spontaneous TRS breaking, which is characterized by a Chern number C=2 and quasi-long-range superconducting order. We map out the quantum phase diagram with by tuning the next-nearest-neighbor (NNN) electron hopping and spin interaction. In the weaker NNN-coupling regime, we identify a pseudogaplike phase with a charge stripe order coexisting with fluctuating superconductivity, which can be tuned into d -wave superconductivity by increasing the doping level and system width. The TSC emerges in the intermediate-coupling regime, which has a transition to a d-wave superconducting phase with larger NNN couplings. The emergence of the TSC is driven by geometrical frustrations and hole dynamics which suppress spin correlation and charge order, leading to a topological quantum phase transition.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); California State University, Northridge (CSUN), CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: 89233218CNA000001; FG02-06ER46305

OSTI ID:: 1994137

Alternate ID(s):: OSTI ID: 1971668; OSTI ID: 2203461

Report Number(s):: LA-UR-23-24228; TRN: US2404929

Journal Information:: Physical Review Letters, Vol. 130, Issue 13; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators

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