Atomistic attosecond carrier dynamics in a two-dimensional electron gas

Calley N. Eads, Sara L. Zachritz, Joohyung Park, Anubhab Chakraborty, Dennis L. Nordlund, Oliver L.A. Monti

Research output: Contribution to journalArticlepeer-review

Abstract

Electronic interactions associated with atomic adsorbates on transition metal dichalcogenides such as MoS2 can induce massive electronic reconstruction that results in the formation of a new type of heavily doped transition metal dichalcogenide that exhibits characteristics of a two-dimensional electron gas. The impact of quantum confinement and reduced dimensionality on the carrier dynamics in such two-dimensional systems is at present not known, but is of paramount importance if they are to find application in optoelectronic devices. Here we show by a combination of angle-resolved photoemission and advanced x-ray spectroscopies that many-body interactions in reduced dimension drastically shorten carrier lifetimes to below 0.5 fs, and reveal how potassium intercalation in MoS2 forces orbital rehybridization to create a two-dimensional electron gas.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Jan 16 2020

ASJC Scopus subject areas

  • General

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