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对磁性掺杂拓扑绝缘体表面破缺时间反演对称性的直接观测。

Direct observation of broken time-reversal symmetry on the surface of a magnetically doped topological insulator.

机构信息

Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.

出版信息

Phys Rev Lett. 2011 May 20;106(20):206805. doi: 10.1103/PhysRevLett.106.206805. Epub 2011 May 17.

DOI:10.1103/PhysRevLett.106.206805
PMID:21668255
Abstract

We study interference patterns of a magnetically doped topological insulator Bi(2-x)Fe(x)Te(3+d) by using Fourier transform scanning tunneling spectroscopy and observe several new scattering channels. A comparison with angle-resolved photoemission spectroscopy allows us to unambiguously ascertain the momentum-space origin of distinct dispersing channels along high-symmetry directions and identify those originating from time-reversal symmetry breaking. Our analysis also reveals that the surface state survives far above the energy where angle-resolved photoemission spectroscopy finds the onset of continuum bulk bands.

摘要

我们通过傅里叶变换扫描隧道光谱研究了掺杂磁拓扑绝缘体 Bi(2-x)Fe(x)Te(3+d)的干涉模式，观察到了几个新的散射通道。与角分辨光发射光谱的比较使我们能够明确确定高对称方向上不同色散通道的动量空间起源，并确定那些源自时间反转对称性破缺的通道。我们的分析还表明，表面态在角分辨光发射光谱发现连续体能带开始出现的能量之上仍然存在。

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