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Tunable excitons in bilayer graphene

Excitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal bo... Full description

Journal Title: Science (New York N.Y.), 17 November 2017, Vol.358(6365), pp.907-910
Main Author: Ju, Long
Other Authors: Wang, Lei , Cao, Ting , Taniguchi, Takashi , Watanabe, Kenji , Louie, Steven G , Rana, Farhan , Park, Jiwoong , Hone, James , Wang, Feng , Mceuen, Paul L
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1095-9203 ; PMID: 29146807 Version:1 ; DOI: 10.1126/science.aam9175
Link: http://pubmed.gov/29146807
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recordid: medline29146807
title: Tunable excitons in bilayer graphene
format: Article
creator:
  • Ju, Long
  • Wang, Lei
  • Cao, Ting
  • Taniguchi, Takashi
  • Watanabe, Kenji
  • Louie, Steven G
  • Rana, Farhan
  • Park, Jiwoong
  • Hone, James
  • Wang, Feng
  • Mceuen, Paul L
subjects:
  • Optical Properties
  • Excitation
  • Splitting
  • Graphene
  • Boron
  • Semiconductors
  • Physics
  • Optoelectronics
  • Photoelectric Effect
  • Insulators
  • Valleys
  • Spectroscopy
  • Boron
  • Magnetic Fields
  • Electrons
  • Optical Properties
  • Boron Nitride
  • Electronics Industry
  • Magnetic Resonance
  • Excitons
  • Optical Properties
  • Bilayers
  • Photoelectric Emission
ispartof: Science (New York, N.Y.), 17 November 2017, Vol.358(6365), pp.907-910
description: Excitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a -factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems​.
language: eng
source:
identifier: E-ISSN: 1095-9203 ; PMID: 29146807 Version:1 ; DOI: 10.1126/science.aam9175
fulltext: fulltext
issn:
  • 10959203
  • 1095-9203
url: Link


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titleTunable excitons in bilayer graphene
creatorJu, Long ; Wang, Lei ; Cao, Ting ; Taniguchi, Takashi ; Watanabe, Kenji ; Louie, Steven G ; Rana, Farhan ; Park, Jiwoong ; Hone, James ; Wang, Feng ; Mceuen, Paul L
ispartofScience (New York, N.Y.), 17 November 2017, Vol.358(6365), pp.907-910
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descriptionExcitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a -factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems​.
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subjectOptical Properties ; Excitation ; Splitting ; Graphene ; Boron ; Semiconductors ; Physics ; Optoelectronics ; Photoelectric Effect ; Insulators ; Valleys ; Spectroscopy ; Boron ; Magnetic Fields ; Electrons ; Optical Properties ; Boron Nitride ; Electronics Industry ; Magnetic Resonance ; Excitons ; Optical Properties ; Bilayers ; Photoelectric Emission;
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titleTunable excitons in bilayer graphene
descriptionExcitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a -factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems​.
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authorJu, Long ; Wang, Lei ; Cao, Ting ; Taniguchi, Takashi ; Watanabe, Kenji ; Louie, Steven G ; Rana, Farhan ; Park, Jiwoong ; Hone, James ; Wang, Feng ; Mceuen, Paul L
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abstractExcitons, the bound states of an electron and a hole in a solid material, play a key role in the optical properties of insulators and semiconductors. Here, we report the observation of excitons in bilayer graphene (BLG) using photocurrent spectroscopy of high-quality BLG encapsulated in hexagonal boron nitride. We observed two prominent excitonic resonances with narrow line widths that are tunable from the mid-infrared to the terahertz range. These excitons obey optical selection rules distinct from those in conventional semiconductors and feature an electron pseudospin winding number of 2. An external magnetic field induces a large splitting of the valley excitons, corresponding to a -factor of about 20. These findings open up opportunities to explore exciton physics with pseudospin texture in electrically tunable graphene systems​.
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date2017-11-17