Stark Effect Spectroscopy of Mono- and Few-Layer MoS2

J. Klein, J. Wierzbowski, A. Regler, J. Becker, F. Heimbach, K. Müller, M. Kaniber, J. J. Finley

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

We demonstrate electrical control of the A-exciton interband transition in mono- and few-layer MoS2 crystals embedded into photocapacitor devices via the DC Stark effect. Electric field-dependent low-temperature photoluminescence spectroscopy reveals a significant tuneability of the A-exciton transition energy up to ∼16 meV from which we extract the mean DC exciton polarizability <β¯N> = (0.58 ± 0.25) × 10-8 Dm V-1. The exciton polarizability is shown to be layer-independent, indicating a strong localization of both electron and hole wave functions in each individual layer.

Original languageEnglish
Pages (from-to)1554-1559
Number of pages6
JournalNano Letters
Volume16
Issue number3
DOIs
StatePublished - 9 Mar 2016

Keywords

  • 2D materials
  • electrical control
  • exciton polarizability
  • molybdenum disulfide
  • quantum confined Stark effect
  • transition metal dichalcogenides

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