TY - JOUR
T1 - Parameter dependence of optical conductivity in antiferromagnetic phase of iron pnictides
AU - Sugimoto, K.
AU - Kaneshita, E.
AU - Tohyama, T.
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan ; the Global COE Program “The Next Generation of Physics, Spun from University and Emergence”; the Next Generation Supercomputing Project of Nanoscience Program; and Yukawa Institutional Program for Quark-Hadron Science at YITP. The numerical computation in this work was carried out at the Yukawa Institute Computer Facility. E. K. acknowledges a support from Yukawa Memorial Foundation.
PY - 2011/11
Y1 - 2011/11
N2 - We investigate the optical conductivity of iron pnictides in antiferromagnetic state by mean-field calculation in a five-band Hubbard model, focusing on its anisotropic behavior by examining several states calculated with different Hund coupling J, such as the states with a low or high magnetization and with or without a strong orbital ordering. In addition, we investigate the J dependence of the Dirac cone structure, which is crucial for the low energy excitation. In our calculations, a weakly ordered state with no orbital ordering shows the anisotropy of optical conductivity in accord with experiments. We conclude that the low energy part of the optical conductivity is relevant to the Dirac electron structure rather than the orbital ordering.
AB - We investigate the optical conductivity of iron pnictides in antiferromagnetic state by mean-field calculation in a five-band Hubbard model, focusing on its anisotropic behavior by examining several states calculated with different Hund coupling J, such as the states with a low or high magnetization and with or without a strong orbital ordering. In addition, we investigate the J dependence of the Dirac cone structure, which is crucial for the low energy excitation. In our calculations, a weakly ordered state with no orbital ordering shows the anisotropy of optical conductivity in accord with experiments. We conclude that the low energy part of the optical conductivity is relevant to the Dirac electron structure rather than the orbital ordering.
KW - Anisotropy
KW - Dirac cone
KW - Iron pnictide superconductor
KW - Optical conductivity
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U2 - 10.1016/j.physc.2011.05.022
DO - 10.1016/j.physc.2011.05.022
M3 - Article
AN - SCOPUS:80054965970
SN - 0921-4534
VL - 471
SP - 666
EP - 669
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 21-22
ER -