Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-07
Phys. Rev. Lett. 103, 177402 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 2 figures, some typos are corrected
Scientific paper
10.1103/PhysRevLett.103.177402
The low-energy dynamical optical response of dimerized and undimerized spin liquid states in a one-dimensional charge transfer Mott insulator is theoretically studied. An exact analysis is given for the low-energy asymptotic behavior using conformal field theory for the undimerized state. In the dimerized state, the infrared absorption due to the bound state of two solitons, i.e, the breather mode, is predicted with an accurate estimate for its oscillator strength, offering a way to detect experimentally the excited singlet state. Effects of external magnetic fields are also discussed.
Furuta Takashi
Katsura Hosho
Nagaosa Naoto
Sato Masahiro
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