Giant Valley-Polarized Rydberg Excitons in Monolayer WSe2Revealed by Magneto-photocurrent Spectroscopy

Tianmeng Wang, Zhipeng Li, Yunmei Li, Zhengguang Lu, Shengnan Miao, Zhen Lian, Yuze Meng, Mark Blei, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Dmitry Smirnov, Chuanwei Zhang, Su Fei Shi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

A strong Coulomb interaction could lead to a strongly bound exciton with high-order excited states, similar to the Rydberg atom. The interaction of giant Rydberg excitons can be engineered for a correlated ordered exciton array with a Rydberg blockade, which is promising for realizing quantum simulation. Monolayer transition metal dichalcogenides, with their greatly enhanced Coulomb interaction, are an ideal platform to host the Rydberg excitons in two dimensions. Here, we employ helicity-resolved magneto-photocurrent spectroscopy to identify Rydberg exciton states up to 11s in monolayer WSe2. Notably, the radius of the Rydberg exciton at 11s can be as large as 214 nm, orders of magnitude larger than the 1s exciton. The giant valley-polarized Rydberg exciton not only provides an exciting platform to study the strong exciton-exciton interaction and nonlinear exciton response but also allows the investigation of the different interplay between the Coulomb interaction and Landau quantization, tunable from a low- to high-magnetic-field limit.

Original languageEnglish (US)
Pages (from-to)7635-7641
Number of pages7
JournalNano Letters
Volume20
Issue number10
DOIs
StatePublished - Oct 14 2020

Keywords

  • 11s exciton
  • Landau quantization
  • Rydberg exciton
  • Strong Coulomb interaction
  • photocurrent spectroscopy
  • valley polarization

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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