Spin Liquid State around a Doped Hole in Insulating Cuprates.

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  • Tohyama Takami
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Shibata Yasumasa
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Maekawa Sadamichi
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Shen Z.–X.
    Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, California 94305, U.S.A.
  • Nagaosa Naoto
    Department of Applied Physics, University of Tokyo, Bunkyo–ku, Tokyo 113–8656
  • Miller Lance L.
    Ames Laboratory, Iowa State University, Ames, Iowa 50011, U.S.A.

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The numerically exact diagonalization study on small clusters of the t-J model with second- and third-neighbor hopping terms shows that a novel spin liquid state is realized around a doped hole with momentum k =(π, 0) and energy --2J compared with that with (π/2, π/2) in insulating cuprates, where the spin and charge degrees of freedom are approximately decoupled. Our finding implies that the excitations in the insulating cuprates are mapped onto the d-wave resonating valence bond state.

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