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Pseudogap phase as fluctuating pair density wave
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abstract
The physical nature of pseudogap phase is one of the most important and intriguing problems towards understanding the key mechanism of high temperature superconductivity in cuprates. Theoretically, the square-lattice $t$-$J$ model is widely believed to be the simplest toy model that captures the essential physics of cuprate superconductors. We employ the Grassmann tensor product state approach to investigate uniform states in the underdoped ($\delta \lesssim 0.1$) region. In addition to the previously known uniform $d$-wave state, we discover a strongly fluctuating pair density wave (PDW) state with wave vector $Q = (\pi, \pi)$. This fluctuating PDW state weakly breaks the $C_4$ rotational symmetry of the square lattice and has a lower or comparable energy to the $d$-wave state (depending on doping and the $t/J$ ratio), making it a promising candidate state for describing the pseudogap phase.
Forward citations
Cited by 2 Pith papers
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Robust spin pseudogap and spin-charge separation in the $\sigma t$-$J$ model
The σt-J model is found to keep its spin pseudogap and spin-sector BKT transition almost doping-independent, which a slave-fermion mean-field theory with a PSG-selected ansatz explains as spin-charge separation.
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Strong pair-density-wave fluctuations in an exactly solvable doped Mott insulator
The Hatsugai-Kohmoto model with pairing interactions shows strong pair-density-wave fluctuations at momentum (π,π) for low doping and intermediate interaction, competing with ordinary superconductivity.
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