Effect of higher harmonics in quarter-filled Su-Schrieffer-Heeger model |
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| Authors: | Y Ohfuti Y Ono |
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| Institution: | Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113, Japan |
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| Abstract: | The role of the higher harmonics of the order parameter in the ground state of the quarter-filled Su-Schrieffer-Heeger model is investigated. The lowest energy is obtained when the 4kF order parameter Δ2 vanishes. Furthermore, as far as the uniform excitations are concerned, the energy of the system has a minimum at a finite value of Δ2 when the phase of the fundamental (or 2kF) order parameter deviates from its ground state values. |
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