Environmental effects on layer-dependent dynamics of Dirac fermions in quasicrystalline bilayer graphene
Environmental effects on layer-dependent dynamics of Dirac fermions in quasicrystalline bilayer graphene
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环境对准晶双层石墨烯中狄拉克费米子层相关动力学的影响
DOI：
10.1103/physrevb.105.115304
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发表时间：
2022
影响因子：
3.7
通讯作者：
H. Fukidome and I. Matsuda
中科院分区：
文献类型：
--
作者：
Y. Zhao;T. Suzuki;T. Iimori;H.-W. Kim;J. R. Ahn;M. Horio;Y. Sato;Y. Fukaya;T. Kanai;K. Okazaki;S. Shin;S. Tanaka;F. Komori;H. Fukidome and I. Matsuda
用时间分辨和角度分辨光电子能谱(TARPES)研究了碳化硅衬底上不同类型的石墨烯外延薄膜中的载流子动力学。准晶体双层石墨烯在光泵浦后的Dirac带中观察到与层有关的电子掺杂，从而在上下两层之间产生了暂态电压。光致载流子输运量取决于与衬底的距离。对单层石墨烯在平面和阶梯状碳化硅衬底上的TARPES结果的比较实验表明，掺杂载流子的来源可能来自界面阶跃态。动力学模型是基于电子结构描述的，用密度泛函理论计算。
The carrier dynamics in various types of epitaxial graphene layers on SiC substrates was investigated by means of time- and angle-resolved photoemission spectroscopy (TARPES). Layer-dependent electron doping was observed in the Dirac bands of quasicrystalline bilayer graphene after optical pumping, leading to generation of transient voltage between the upper and lower layers. The amount of photoinduced carrier transport depends on the distance from the substrate. A comparison of the TARPES results of single-layer graphene between flat and stepped SiC substrates experimentally indicates that a source of the doping carriers likely originates from interface step states. The dynamic model is described based on the electronic structure, calculated using density functional theory.
SiC(0001) 表面纳米面的魔角和高度量化
影响因子：
4
作者：
K. Sawada;J. Iwata;A. Oshiyama
通讯作者：
A. Oshiyama
影响因子：
4
作者：
Emery, Jonathan D.;Wheeler, Virginia H.;Bedzyk, Michael J.
通讯作者：
Bedzyk, Michael J.
邻近固体表面上聚集台阶之间排斥相互作用的起源
影响因子：
0.7
作者：
K. Sawada;J. Iwata;A. Oshiyama
通讯作者：
A. Oshiyama