Journal
PHYSICAL REVIEW B
Volume 88, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.155112
Keywords
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Funding
- NSF [PHY05-51164, DMR-0804564, DMR-1005541]
- National Basic Research Program of China [2011CBA00300, 2011CBA00302]
- Packard Fellowship
- DOE [DE-AC02-05CH11231]
- Tsinghua Startup Funds
- NSFC [11074140]
- [DMR-1205734]
- [DMR-0906816]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1205734] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906816] Funding Source: National Science Foundation
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The emergence of superconductivity in doped Mott insulators has been debated for decades. In this paper, we report the theoretical discovery of a time-reversal symmetry breaking superconducting ground state in the doped Mott insulator (described by the well known t-J model) on honeycomb lattice, based on a recently developed variational method: the Grassmann tensor product state approach. As a benchmark, we use exact diagonalization and density-matrix renormalization methods to check our results on small clusters. We find systematic consistency for the ground-state energy as well as other physical quantities, such as the staggered magnetization. At low doping, the superconductivity coexists with antiferromagnetic ordering.
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