Antiferromagnetic FeSe monolayer on SrTiO3: the charge doping and electric field effects.
Antiferromagnetic FeSe monolayer on SrTiO3: the charge doping and electric field effects.
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SrTiO3 上的反铁磁 FeSe 单层：电荷掺杂和电场效应
DOI：
10.1038/srep02213
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发表时间：
2013
影响因子：
4.6
通讯作者：
Zhang, Ping
中科院分区：
文献类型：
--
作者：
Zheng, Fawei;Wang, Zhigang;Kang, Wei;Zhang, Ping
通过在SrTiO_3（001）表面生长FeSe单层膜，获得了铁基超导体的最高超导转变温度。在这里，我们研究了反铁磁（AFM）棋盘单层FeSe吸附在SrTiO 3（001）表面。结果表明，该体系具有从SrTiO_3（001）衬底到FeSe单层膜的电荷转移，并具有自构电场.靠近布里渊区（Brillouin zone，BZ）中心的FeSe单层能带结构对电荷掺杂敏感，垂直电场使BZ拐角处的自旋分辨能带发生畸变而变平。结果表明，BZ中心周围费米面的消失可以很好地解释与电荷掺杂和电场效应的原子力显微镜棋盘相。我们提出了一个紧束缚模型的哈密顿量考虑到这些关键因素。结果表明，该复合结构是一个理想的电子-空穴双层系统，电子和空穴分别形成在FeSe单层和TiO 2表面层。
By growing monolayer FeSe on SrTiO3(001) surface, researchers obtain the highest superconducting transition-temperature for iron-based superconductor. Here, we study the antiferromagnetic (AFM) checkerboard monolayer FeSe adsorbed on SrTiO3(001) surface. We show that the system has a considerable charge transfer from SrTiO3(001) substrate to FeSe monolayer, and so has a self-constructed electric field. The FeSe monolayer band structure near the Brillouin zone (BZ) center is sensitive to charge doping, and the spin-resolved energy bands at BZ corner are distorted to be flattened by the perpendicular electric field. It is revealed that the striking disappearance of the Fermi surface around the BZ center can be well explained by the AFM checkerboard phase with charge doping and electric field effects. We propose a tight-binding model Hamiltonian to take these key factors into account. We also show that this composite structure is an ideal electron-hole bilayer system, with electrons and holes respectively formed in FeSe monolayer and TiO2 surface layer.
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