Doping induced spinless collective excitations of charge 2e in doped Mott insulators

Details Doping induced spinless collective excitations of charge 2e in doped Mott insulators Doping induced spinless collective excitations of charge 2e in doped Mott insulators

2000-10-29

arxiv.org/abs/cond-mat/0010470v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

Based on the Hubbard model description of the doped Mott insulator, we prove that there must exist a spinless collective excitation of charge $2e$ and of energy $U-2\mu$ peaked at momentum $(\pi/a,\pi/a)$ in the non-superconducting state due to doping. Such a collective excitation arises from the electron pair correlation. Its existence is related to the breakdown of an approximate SU(2) particle-hole symmetry, from which an effective field theory of the new excitations is constructed.

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