Appearance of a Drude-Like Peak from Spin-Wave Excitations in the Effectively Half-Filled Mott Insulator(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We calculate the optical conductivity of the effectively half-filled Mott insulator that has been put forward as a relevant state for cuprates. It is shown that a Drude-like peak appears from transitions to spin-wave excited states that emerge when spin vortices exist; thus, it is indicated that the Drude-like peak in underdoped cuprates may not be a sign of the coherent motion of doped holes, but actually a sign of the presence of spin vortices and small polarons. The amplitude of the Drude-like peak increases with an increase in the number of spin vortices. Therefore, the doping and temperature dependences of the optical conductivity of cuprates are explained by the doping and temperature variations in the number of spin vortices. The calculated effective carrier number is also shown to explain the experimental value.
- 社団法人日本物理学会の論文
- 2008-12-15
著者
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Koizumi Hiroyasu
Institute Of Materials Science University Of Tsukuba
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Koizumi Hiroyasu
Institute of Materials Science, University of Tsukuba
関連論文
- Spin-Wave Excitations in Effectively Half-Filled Mott Insulators(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Two-Copper-Atom Units Induce a Pseudo Jahn-Teller Polaron in Hole-Doped Cuprate Superconductors(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Appearance of a Drude-Like Peak from Spin-Wave Excitations in the Effectively Half-Filled Mott Insulator(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Loop Current Excitations in Effectively Half-Filled Mott Insulators(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Appearance of a Drude-Like Peak from Spin-Wave Excitations in the Effectively Half-Filled Mott Insulator