多铁性材料TbMnO₃中自旋激发的电偶极活性连续能带的证据。
Evidence for an electric-dipole active continuum band of spin excitations in multiferroic TbMnO3.
作者信息
Takahashi Y, Kida N, Yamasaki Y, Fujioka J, Arima T, Shimano R, Miyahara S, Mochizuki M, Furukawa N, Tokura Y
机构信息
Multiferroics Project, ERATO, Japan Science and Technology Agency (JST), Japan c/o Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
出版信息
Phys Rev Lett. 2008 Oct 31;101(18):187201. doi: 10.1103/PhysRevLett.101.187201. Epub 2008 Oct 27.
The wide range optical spectra on a multiferroic prototype TbMnO3 have been investigated to clarify the origin of spin excitations observed in the far-infrared region. We elucidate the full band structure, whose high energy edge (133 cm;{-1}) exactly corresponds to twice of the highest-lying magnon energy. Thus the origin of this absorption band is clearly assigned to two-magnon excitation driven by the electric field of light. There is an overlap between the two-magnon and phonon energy ranges, where the strong coupling between them is manifested by the frequency shift and transfer of oscillator strength of the phonon mode.
对多铁性原型TbMnO₃的宽范围光谱进行了研究，以阐明在远红外区域观察到的自旋激发的起源。我们阐明了完整的能带结构，其高能边缘（133厘米⁻¹）恰好对应于最高磁振子能量的两倍。因此，该吸收带的起源明确归因于由光场驱动的双磁振子激发。双磁振子和声子能量范围之间存在重叠，它们之间的强耦合表现为声子模式的频率移动和振子强度转移。
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