Picosecond resolution photoelectron emission lifetime detection system

TL;DR

This paper introduces a high-resolution photoelectron emission lifetime detection system utilizing RF timing and ultrafast lasers, capable of measuring lifetimes from gold, MoS2, and graphene with picosecond precision.

Contribution

It presents a novel detection system that achieves picosecond resolution for measuring photoelectron emission lifetimes in various materials.

Findings

No delayed electrons observed from gold.

Measured photoelectron lifetime of ~189 ps in graphene.

Device time resolution of approximately 12 ps.

Abstract

This paper describes a new photoelectron emission lifetime detection system. It is based on a recently developed Radio Frequency Timing technique of keV electrons and a 40 MHz, ultrafast pulsed laser. The photoelectron emission lifetimes from gold, monolayer MoS$_2$ and monolayer graphene were measured. As expected, we do not observe delayed electrons from gold, and the time distribution of the produced photoelectrons represents the time resolution of the device, which is $\sim$12~ps. From the graphene, we observed delayed photoelectrons with a lifetime of $\sim$189~ps.