Journal
NPJ QUANTUM MATERIALS
Volume 6, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41535-021-00363-0
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Funding
- Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
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The study focuses on the effects of doping the Kitaev model on the honeycomb lattice, revealing that under light doping, the ground state of the system exhibits dominant quasi-long-range charge-density-wave correlations. In the pairing channel, even-parity superconducting correlation with d-wave-like symmetry is predominant, oscillating in sign with a period equal to that of the spin-density wave and two times the charge-density wave.
We study the effects of doping the Kitaev model on the honeycomb lattice where the spins interact via the bond-directional interaction J(K), which is known to have a quantum spin liquid as its exact ground state. The effect of hole doping is studied within the t-J(K) model on a three-leg cylinder using density-matrix renormalization group. Upon light doping, we find that the ground state of the system has a dominant quasi-long-range charge-density-wave correlations but short-range single-particle correlations. In the pairing channel, the even-parity superconducting correlation is dominant with d-wave-like symmetry, which oscillates in sign as a function of separation with a period equal to that of the spin-density wave and two times the charge-density wave. Although these correlations fall rapidly (possibly exponentially) at long distances, this is never-the-less the example where a pair-density wave is the leading instability in the pairing channel on the honeycomb lattice.
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