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Robust d-Wave Superconductivity in the Square-Lattice t-J Model
Shoushu Gong1, W Zhu2, D N Sheng3
1Department of Physics, Beihang University, Beijing 100191, China.
Physical Review Letters
|September 10, 2021
Summary
Researchers explored superconductivity in doped Mott insulators using the t-J model. They found robust d-wave superconductivity emerges from enhanced charge and spin fluctuations at optimal doping levels.
Area of Science:
- Condensed matter physics
- Quantum materials science
Background:
- Doped Mott insulators exhibit complex competing orders.
- Understanding their interplay with unconventional superconductivity is a key challenge.
Purpose of the Study:
- To investigate the superconducting state in a doped Mott insulator.
- To establish a quantum phase diagram of the square-lattice t-J model.
Main Methods:
- Utilized density matrix renormalization group (DMRG) calculations.
- Imposed U(1) and SU(2) symmetries on six-leg cylinders.
- Studied the t-J model with nearest-neighbor and next-nearest-neighbor interactions.
Main Results:
- Identified three distinct phases: stripe charge density wave, superconducting without static charge order, and superconducting with weak charge stripe order.
- Demonstrated power-law decay in superconducting pairing correlations, slower than charge/spin correlations.
- Characterized superconductivity as a quasi-1D descendant of 2D d-wave superconductivity.
Conclusions:
- Optimal doping and enhanced charge/spin fluctuations drive robust d-wave superconductivity in doped Mott insulators.
- Provides a link between superconductivity theories and strongly correlated systems.
- Offers insights into emergent phenomena in quantum materials.
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