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A. S. Mishchenko and N. Nagaosa
We present numeric results for ground state and angle resolved photoemission spectra (ARPES) for a hole in tt't''-J model coupled to optical phonons. The systematic-error free diagrammatic Monte Carlo [1,2] is employed where the Feynman graphs for the Matsubara Green function in imaginary time are summed up completely with respect to phonons variables and analytic continuation is done by a novel error-free stochastic optimization method. It is found that interplay of electron-phonon interaction with intrinsic to the holes in Mott insulator interaction with magnons can explain the main puzzles encountered in ARPES experimental studies: anomalous damping in underdoped and moderately doped regime, ``kink'', anomalous ``universal velocity'', and giant anomalous isotope effect. Crucial discussions with Z.-X. Shen are acknowledged. [1] A. S. Mishchenko et. al., Phys. Rev. B, vol. 62, 6317 (2000) [2] A. S. Mishchenko and N. Nagaosa Phys. Rev. Lett., vol. 93 036402 (2004) |