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首页> 外文期刊>Physical review >Emergence of Dirac electron pair in the charge-ordered state of the organic conductor α-(BEDT-TTF)_2I_3
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Emergence of Dirac electron pair in the charge-ordered state of the organic conductor α-(BEDT-TTF)_2I_3

机译：有机导体α-（BEDT-TTF）_2I_3的电荷有序状态下狄拉克电子对的出现

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摘要

We reexamine the band structure of the stripe charge ordered state of a-(BEDT-TTF)2l3 under pressure by using an extended Hubbard model within the Hartree mean-field theory. By increasing pressure, we find a topological transition from a conventional insulator with a single-minimum in the dispersion relation at the M point in the Brillouin zone, toward a new phase which exhibits a double minimum. This transition is characterized by the appearance of a pair of Dirac electrons with a finite mass. Using the Luttinger-Kohn representation at the M point, it is shown that such a variation of the band structure can be described by an effective 2x2 low-energy Hamiltonian with a single driving parameter. The topological nature of this transition is confirmed by the calculation of the Berry curvature which vanishes in the conventional phase and has a double peak structure with opposite signs in the new phase. We compare the structure of this transition with a simpler situation which occurs in two-component systems, like boron-nitride.
机译：我们通过使用Hartree平均场理论中的扩展Hubbard模型，重新研究在压力下a-（BEDT-TTF）2l3的条纹电荷有序状态的能带结构。通过增加压力，我们发现从传统绝缘体的布里渊区M点处的色散关系只有一个最小值的拓扑过渡到一个显示出两倍最小值的新相。该跃迁的特征是出现了一对质量有限的狄拉克电子。使用在M点的Luttinger-Kohn表示，表明可以通过具有单个驱动参数的有效2x2低能哈密顿量来描述能带结构的这种变化。通过计算在常规相中消失并在新相中具有相反符号的双峰结构的贝里曲率，可以确定这种转变的拓扑性质。我们将这种过渡的结构与在诸如硼氮化物之类的两组分系统中发生的更简单情况进行了比较。

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