基于可调谐真空紫外光源的高分辨率兆赫兹时间和角度分辨光电子能谱。

High-resolution MHz time- and angle-resolved photoemission spectroscopy based on a tunable vacuum ultraviolet source.

作者信息

Hellbrück Lukas, Puppin Michele, Guo Fei, Hickstein Daniel D, Benhabib Siham, Grioni Marco, Dil J Hugo, LaGrange Thomas, Rønnow Henrik M, Carbone Fabrizio

机构信息

Institute of Physics, Laboratory for Ultrafast Microscopy and Electron Scattering (LUMES), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

Institute of Physics, Laboratory for Quantum Magnetism (LQM), École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

出版信息

Rev Sci Instrum. 2024 Mar 1;95(3). doi: 10.1063/5.0179549.

DOI:10.1063/5.0179549

PMID:38517259

Abstract

The time- and angle-resolved photoemission spectroscopy (trARPES) allows for direct mapping of the electronic band structure and its dynamic response on femtosecond timescales. Here, we present a new ARPES system, powered by a new fiber-based femtosecond light source in the vacuum ultraviolet range, accessing the complete first Brillouin zone for most materials. We present trARPES data on Au(111), polycrystalline Au, Bi2Se3, and TaTe2, demonstrating an energy resolution of 21 meV with a time resolution of <360 fs, at a high repetition rate of 1 MHz. The system is integrated with an extreme ultraviolet high harmonic generation beamline, enabling an excellent tunability of the time-bandwidth resolution.

摘要

时间和角度分辨光电子能谱（trARPES）能够直接绘制电子能带结构及其在飞秒时间尺度上的动态响应。在此，我们展示了一种新的ARPES系统，由基于光纤的真空紫外范围内的新型飞秒光源驱动，可覆盖大多数材料的完整第一布里渊区。我们展示了在Au(111)、多晶Au、Bi2Se3和TaTe2上的trARPES数据，在1MHz的高重复率下，能量分辨率为21meV，时间分辨率小于360fs。该系统与极紫外高次谐波产生光束线集成，实现了出色的时间带宽分辨率可调性。