Instanton in disordered Peierls systems |
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| Institution: | 1. School of Environmental Science and Engineering/Tianjin Key Lab of Biomass Waste Utilization, Tianjin University, Tianjin 300072, China;2. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310023, China;3. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China;4. Institute of Environmental Sciences (CML), Leiden University, Leiden 2300 RA, the Netherlands;1. Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan;2. The Hakubi Center for Advanced Research, Kyoto University, Yoshida-Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan;3. Stanford Institute for Theoretical Physics, Department of Physics, Stanford University, Stanford, CA 94305, USA;4. Crete Center for Theoretical Physics, Department of Physics, University of Crete, 71003 Heraklion, Greece;5. Crete Center for Quantum Complexity and Nanotechnology, Department of Physics, University of Crete, 71003 Heraklion, Greece;6. Department of Physics, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan |
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| Abstract: | We study disordered Peierls systems described by the fluctuating gap model. We show that the typical electron states with energies lying deep inside the pseudogap are localized near large disorder fluctuations (instantons), which have the form of a soliton-antisoliton pair. Using the “saddle-point” method we obtain the average density of states and the average optical absorption coefficient at small energy. |
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