Doping quantum spin liquids and superconductivity

Understanding the emergence of unconventional superconductivity in strongly correlated systems such as cuprates is a major challenge of modern physics. Despite extensive studies in the past several decades, the mechanism of unconventional superconductivity remains still elusive. One attractive notion that was proposed early on is that unconventional superconductivity could arise naturally in which the insulating parent state is a quantum spin liquid (QSL) rather than an ordered antiferromagnet. In particular, a gapped QSL can be considered as an insulating state but with preexisting Cooper pairs, so that superconductivity could arise naturally upon light doping. In this talk, I will show several examples based on unbiased DMRG calculations that doping QSLs indeed can give rise to superconductivity. To make a clearer connection between doping QSLs and superconductivity, comparisons with doping other quantum paramagnets will also be made.

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