Ultrafast Carrier Dynamics in Two-Dimensional Electron Gas-like K-Doped MoS2

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 van der Waals layered transition-metal dichalcogenides such as MoS2 can induce massive electronic reconstruction that results in the formation of a metallic phase that exhibits characteristics of a two-dimensional electron gas. The impact and mechanism of quantum confinement and reduced dimensionality on the carrier dynamics in such two-dimensional systems is at present not known, but it 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 and reveal how potassium intercalation in MoS2 forces orbital rehybridization to create a two-dimensional electron gas.

Original languageEnglish (US)
Pages (from-to)19187-19195
Number of pages9
JournalJournal of Physical Chemistry C
Volume124
Issue number35
DOIs
StatePublished - Sep 3 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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