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arXiv 1305.3605cond-mat.mes-hall
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三维拓扑绝缘体金属表面态的多体效应和可能的超导电性

Many-body effects and possible superconductivity in the 2D metallic surface states of 3D topological insulators

S. Das Sarma, Qiuzi Li

摘要:

我们从理论上考虑了限制在三维拓扑绝缘体(如Bi $_2$ Se $_3$)表面的二维金属载流子中温度和密度相关的电子-声子相互作用引起的多体效应.我们计算了电子自能的实部和虚部、相互作用谱函数和声子诱导速度重整化对温度和载流子密度的依赖关系,使我们能够获得一个简单的依赖于密度和温度的有效无因次电子-声子耦合常数参数,该参数随着密度(温度)的增加而强烈增加(减少)。我们的理论结果可以直接和定量地与实验ARPES或STS研究的二维光谱函数的拓扑绝缘体表面载流子。特别地,我们预测了Bi $_2$ Se $_3$中可能存在由强电子-声子相互作用引起的表面超导电性。

英文摘要:

We theoretically consider temperature and density-dependent electron-phonon interaction induced many-body effects in the two-dimensional (2D) metallic carriers confined on the surface of the 3D topological insulator (e.g. Bi$_2$Se$_3$). We calculate the temperature and the carrier density dependence of the real and imaginary parts of the electronic self-energy, the interacting spectral function, and the phonon-induced velocity renormalization, enabling us to obtain a simple density and temperature dependent effective dimensionless electron-phonon coupling constant parameter, which increases (decreases) strongly with increasing density (temperature). Our theoretical results can be directly and quantitatively compared with experimental ARPES or STS studies of the 2D spectral function of topological insulator surface carriers. In particular, we predict the possible existence of surface superconductivity in Bi$_2$Se$_3$ induced by strong electron-phonon interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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