New Plasmon and Filtering Effect in a Pair of Tilted-Dirac Cone
New Plasmon and Filtering Effect in a Pair of Tilted-Dirac Cone
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一对倾斜狄拉克锥中的新等离子体激元和过滤效应
DOI：
10.1143/jpsj.80.114713
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Y.Suzumura
中科院分区：
文献类型：
--
作者：
T.Nishine;A.Kobayashi;Y.Suzumura
研究了α-（BEDT-TTF）_2I_3等离子体中一对倾斜狄拉克锥的作用。通过对长程库仑相互作用的无规相位近似，计算了动力学极化函数的虚部随频率和波矢q的变化。除了在单个狄拉克锥中发现的传统等离子体激元之外，我们还获得了一对倾斜狄拉克锥的新等离子体激元，它出现在|Q|这是由于两个倾斜的圆锥体的联合作用。利用频率依赖于波矢q与倾斜方向之间的夹角的结果，证明了等离子体激元的滤波。
The effect of a pair of tilted Dirac cones on the plasmon is examined for α-(BEDT-TTF)2I3. The imaginary part of the dynamical polarization function is calculated as a function of frequency and the wave vectorqby applying the random phase approximation to the long-range Coulomb interaction. In addition to the conventional plasmon, as found in a single Dirac cone, we obtain a new plasmon for a pair of tilted Dirac cones, which emerges in the intermediate region of |q| owing to the combined effect of two tilted cones. The filtering of the plasmon is demonstrated using the result that the frequency depends on the angle between the wave vectorqand the tilted direction.