Tracking surface photovoltage dipole geometry in Bi2Se3 with time-resolved photoemission

被引：7
作者：
Ciocys, S. [1 ,2 ]
Morimoto, T. [1 ]
Moore, J. E. [1 ,2 ]
Lanzara, A. [1 ,2 ]
机构：
[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA
来源：
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT | 2019年 / 2019卷 / 10期
基金：
美国国家科学基金会;
关键词：
surface effects; surface spectroscopy; STM etc; topological insulators; topological phases of matter; TOPOLOGICAL INSULATOR;
D O I：
10.1088/1742-5468/ab458a
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Topological insulators have been shown to exhibit strong and long-lived surface photovoltages when excited by an infrared pump. The ability to generate long-lived potentials on these surfaces provides opportunities to manipulate the spin-momentum locked topological surface states. Moreover, the photo-induced nature of this effect allows for localized excitation of arbitrary geometries. Knowing precisely how these potentials form and evolve is critical in understanding how to manage the effect in applications. The uniqueness of the photoemission experimental geometry, in which the photoelectron must traverse the induced surface field in vacuum, provides an interesting probe of the electric dipole shape generated by the surface photovoltage. In this study, we are able to match the observed decay of the geometric effect on the photoelectron to an essential electrodynamics model of the light-induced dipole thereby tracking the fluence-dependent evolution of the dipole geometry. By utilizing a standard time-resolved angle-resolved photoemission experiment, we are able to determine real-space information of the dipole while simultaneously recovering time-resolved band structure.
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页数：11
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