Charge dynamics in doped Mott insulators on a honeycomb lattice

Charge dynamics in doped Mott insulators on a honeycomb lattice
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蜂窝晶格上掺杂莫特绝缘体的电荷动力学

DOI:
10.1142/s0217984916501074
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发表时间:
2015-11
影响因子:
1.9
通讯作者:
Feng Shiping
Feng Shiping
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Ma Xixiao;Lan Yu;Qin Ling;Feng Shiping

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在费米子自旋理论的框架下,考虑赝隙效应,研究了掺杂Mott绝缘子在蜂窝晶格上的电荷输运。结果表明,在低掺杂状态下,电导率谱被赝隙分隔成一个低能量的非德鲁德峰,随后是一个宽的中红外波段。然而,随着掺杂量的增加,赝隙的减小导致中红外波段的位置向低能非德鲁德峰移动,然后在高掺杂状态下恢复低能德鲁德行为。结果表明,由赝隙引起的双组分电导率是掺杂Mott绝缘子的一个普遍特征。
Within the framework of the fermion-spin theory, the charge transport in the doped Mott insulators on a honeycomb lattice is studied by taking into account the pseudogap effect. It is shown that the conductivity spectrum in the low-doped regime is separated by the pseudogap into a low-energy non-Drude peak followed by a broad mid-infrared band. However, the decrease of the pseudogap with the increase of doping leads to a shift of the position of the mid-infrared band towards the low-energy non-Drude peak, and then the low-energy Drude behavior recovers in the high-doped regime. The combined results of both the doped honeycomb-lattice and square-lattice Mott insulators indicate that the two-component conductivity induced by the pseudogap is a universal feature in the doped Mott insulators.
DOI: 10.1143/jpsj.79.114705
发表时间: 2010-11-01
影响因子: 1.7
作者:
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