一种用于测量复杂材料的超快角分辨光电子能谱仪。

An ultrafast angle-resolved photoemission apparatus for measuring complex materials.

作者信息

Smallwood Christopher L, Jozwiak Christopher, Zhang Wentao, Lanzara Alessandra

机构信息

Department of Physics, University of California, Berkeley, California 94720, USA.

出版信息

Rev Sci Instrum. 2012 Dec;83(12):123904. doi: 10.1063/1.4772070.

DOI:10.1063/1.4772070

PMID:23278002

Abstract

We present technical specifications for a high resolution time- and angle-resolved photoemission spectroscopy setup based on a hemispherical electron analyzer and cavity-dumped solid state Ti:sapphire laser used to generate pump and probe beams, respectively, at 1.48 and 5.93 eV. The pulse repetition rate can be tuned from 209 Hz to 54.3 MHz. Under typical operating settings the system has an overall energy resolution of 23 meV, an overall momentum resolution of 0.003 Å(-1), and an overall time resolution of 310 fs. We illustrate the system capabilities with representative data on the cuprate superconductor Bi(2)Sr(2)CaCu(2)O(8+δ). The descriptions and analyses presented here will inform new developments in ultrafast electron spectroscopy.

摘要

我们展示了一种基于半球形电子分析仪和腔倒空固态钛宝石激光器的高分辨率时间和角度分辨光电子能谱装置的技术规格，该激光器分别用于产生能量为1.48和5.93电子伏特的泵浦光束和探测光束。脉冲重复率可在209赫兹至54.3兆赫兹之间调节。在典型的操作设置下，该系统的整体能量分辨率为23毫电子伏特，整体动量分辨率为0.003 Å⁻¹，整体时间分辨率为310飞秒。我们用铜酸盐超导体Bi₂Sr₂CaCu₂O₈₊δ的代表性数据说明了该系统的性能。这里给出的描述和分析将为超快电子能谱的新发展提供参考。