Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states

Owing to nonzero charge and spin degrees of freedom, trions offer unprecedented tunability and open new paths for applications in devices based on 2D semiconductors. However, in monolayer WSe2, the trion photoluminescence is commonly detected only at low temperatures and vanishes at room temperature...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-08, Vol.32 (36)
Main Authors: Riche, Flavio, Bragança, Helena, Qu, Fanyao, Lopez-Richard, Victor, Xie, S J, Dias, A C, Marques, Gilmar Eugenio
Format: Article
Language:English
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
cited_by
cites
container_end_page
container_issue 36
container_start_page
container_title Journal of physics. Condensed matter
container_volume 32
creator Riche, Flavio
Bragança, Helena
Qu, Fanyao
Lopez-Richard, Victor
Xie, S J
Dias, A C
Marques, Gilmar Eugenio
description Owing to nonzero charge and spin degrees of freedom, trions offer unprecedented tunability and open new paths for applications in devices based on 2D semiconductors. However, in monolayer WSe2, the trion photoluminescence is commonly detected only at low temperatures and vanishes at room temperature, which undermines practical applications. To unveil how to overcome this obstacle, we have developed a comprehensive theory to probe the impact of different excitonic channels on the trion emission in WSe2monolayers, which combinesab initiotight-binding formalism, Bethe-Salpeter equation and a set of coupled rate equations to describe valley dynamics of excitonic particles. Through a systematic study in which new scattering channels are progressively included, we found that, besides the low electron density, strong many-body correlations between bright and dark excitonic states quenches the trion emission in WSe2. Therefore, the reduction of scatterings from bright to dark states is required to achieve trion emission at room temperature for experimentally accessible carrier concentrations.
doi_str_mv 10.1088/1361-648X/ab8fd4
format article
fullrecord <record><control><sourceid>proquest</sourceid><recordid>TN_cdi_proquest_miscellaneous_2398639689</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2398639689</sourcerecordid><originalsourceid>FETCH-LOGICAL-p188t-808ec437571cd6f4df73f047106f6969941e0ae09992c450966a2acb294616223</originalsourceid><addsrcrecordid>eNo9j0tLAzEUhYMgWKt7l3fpZmxezSTupPiCguAD3ZU0c2NHZ5IxyYD6660PXJ2Pw8eBQ8gRoyeMaj1jQrFKSf00s2vtG7lDJv_VHtnP-YVSKrWQE_J5G9djLpBi7KFgP2CyZUwI2Lc5tzFkiB5K2hK0ARqbXtu8gcc75H0MsbMfmPIpoPfoyo_7rUDAsSTbgQ0NuI1Nz9gAvru2xNA6yMUWzAdk19su4-FfTsnDxfn94qpa3lxeL86W1cC0LpWmGp0U9bxmrlFeNr4WnsqaUeWVUcZIhtQiNcZwJ-fUKGW5dWtupGKKczElx7-7Q4pvI-ay2l5z2HU2YBzzigujlTBKG_EFWR5hUg</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2398639689</pqid></control><display><type>article</type><title>Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states</title><source>Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)</source><creator>Riche, Flavio ; Bragança, Helena ; Qu, Fanyao ; Lopez-Richard, Victor ; Xie, S J ; Dias, A C ; Marques, Gilmar Eugenio</creator><creatorcontrib>Riche, Flavio ; Bragança, Helena ; Qu, Fanyao ; Lopez-Richard, Victor ; Xie, S J ; Dias, A C ; Marques, Gilmar Eugenio</creatorcontrib><description>Owing to nonzero charge and spin degrees of freedom, trions offer unprecedented tunability and open new paths for applications in devices based on 2D semiconductors. However, in monolayer WSe2, the trion photoluminescence is commonly detected only at low temperatures and vanishes at room temperature, which undermines practical applications. To unveil how to overcome this obstacle, we have developed a comprehensive theory to probe the impact of different excitonic channels on the trion emission in WSe2monolayers, which combinesab initiotight-binding formalism, Bethe-Salpeter equation and a set of coupled rate equations to describe valley dynamics of excitonic particles. Through a systematic study in which new scattering channels are progressively included, we found that, besides the low electron density, strong many-body correlations between bright and dark excitonic states quenches the trion emission in WSe2. Therefore, the reduction of scatterings from bright to dark states is required to achieve trion emission at room temperature for experimentally accessible carrier concentrations.</description><identifier>EISSN: 1361-648X</identifier><identifier>DOI: 10.1088/1361-648X/ab8fd4</identifier><language>eng</language><ispartof>Journal of physics. Condensed matter, 2020-08, Vol.32 (36)</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Riche, Flavio</creatorcontrib><creatorcontrib>Bragança, Helena</creatorcontrib><creatorcontrib>Qu, Fanyao</creatorcontrib><creatorcontrib>Lopez-Richard, Victor</creatorcontrib><creatorcontrib>Xie, S J</creatorcontrib><creatorcontrib>Dias, A C</creatorcontrib><creatorcontrib>Marques, Gilmar Eugenio</creatorcontrib><title>Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states</title><title>Journal of physics. Condensed matter</title><description>Owing to nonzero charge and spin degrees of freedom, trions offer unprecedented tunability and open new paths for applications in devices based on 2D semiconductors. However, in monolayer WSe2, the trion photoluminescence is commonly detected only at low temperatures and vanishes at room temperature, which undermines practical applications. To unveil how to overcome this obstacle, we have developed a comprehensive theory to probe the impact of different excitonic channels on the trion emission in WSe2monolayers, which combinesab initiotight-binding formalism, Bethe-Salpeter equation and a set of coupled rate equations to describe valley dynamics of excitonic particles. Through a systematic study in which new scattering channels are progressively included, we found that, besides the low electron density, strong many-body correlations between bright and dark excitonic states quenches the trion emission in WSe2. Therefore, the reduction of scatterings from bright to dark states is required to achieve trion emission at room temperature for experimentally accessible carrier concentrations.</description><issn>1361-648X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNo9j0tLAzEUhYMgWKt7l3fpZmxezSTupPiCguAD3ZU0c2NHZ5IxyYD6660PXJ2Pw8eBQ8gRoyeMaj1jQrFKSf00s2vtG7lDJv_VHtnP-YVSKrWQE_J5G9djLpBi7KFgP2CyZUwI2Lc5tzFkiB5K2hK0ARqbXtu8gcc75H0MsbMfmPIpoPfoyo_7rUDAsSTbgQ0NuI1Nz9gAvru2xNA6yMUWzAdk19su4-FfTsnDxfn94qpa3lxeL86W1cC0LpWmGp0U9bxmrlFeNr4WnsqaUeWVUcZIhtQiNcZwJ-fUKGW5dWtupGKKczElx7-7Q4pvI-ay2l5z2HU2YBzzigujlTBKG_EFWR5hUg</recordid><startdate>20200826</startdate><enddate>20200826</enddate><creator>Riche, Flavio</creator><creator>Bragança, Helena</creator><creator>Qu, Fanyao</creator><creator>Lopez-Richard, Victor</creator><creator>Xie, S J</creator><creator>Dias, A C</creator><creator>Marques, Gilmar Eugenio</creator><scope>7X8</scope></search><sort><creationdate>20200826</creationdate><title>Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states</title><author>Riche, Flavio ; Bragança, Helena ; Qu, Fanyao ; Lopez-Richard, Victor ; Xie, S J ; Dias, A C ; Marques, Gilmar Eugenio</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p188t-808ec437571cd6f4df73f047106f6969941e0ae09992c450966a2acb294616223</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Riche, Flavio</creatorcontrib><creatorcontrib>Bragança, Helena</creatorcontrib><creatorcontrib>Qu, Fanyao</creatorcontrib><creatorcontrib>Lopez-Richard, Victor</creatorcontrib><creatorcontrib>Xie, S J</creatorcontrib><creatorcontrib>Dias, A C</creatorcontrib><creatorcontrib>Marques, Gilmar Eugenio</creatorcontrib><collection>MEDLINE - Academic</collection><jtitle>Journal of physics. Condensed matter</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Riche, Flavio</au><au>Bragança, Helena</au><au>Qu, Fanyao</au><au>Lopez-Richard, Victor</au><au>Xie, S J</au><au>Dias, A C</au><au>Marques, Gilmar Eugenio</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states</atitle><jtitle>Journal of physics. Condensed matter</jtitle><date>2020-08-26</date><risdate>2020</risdate><volume>32</volume><issue>36</issue><eissn>1361-648X</eissn><abstract>Owing to nonzero charge and spin degrees of freedom, trions offer unprecedented tunability and open new paths for applications in devices based on 2D semiconductors. However, in monolayer WSe2, the trion photoluminescence is commonly detected only at low temperatures and vanishes at room temperature, which undermines practical applications. To unveil how to overcome this obstacle, we have developed a comprehensive theory to probe the impact of different excitonic channels on the trion emission in WSe2monolayers, which combinesab initiotight-binding formalism, Bethe-Salpeter equation and a set of coupled rate equations to describe valley dynamics of excitonic particles. Through a systematic study in which new scattering channels are progressively included, we found that, besides the low electron density, strong many-body correlations between bright and dark excitonic states quenches the trion emission in WSe2. Therefore, the reduction of scatterings from bright to dark states is required to achieve trion emission at room temperature for experimentally accessible carrier concentrations.</abstract><doi>10.1088/1361-648X/ab8fd4</doi></addata></record>
fulltext fulltext
identifier EISSN: 1361-648X
ispartof Journal of physics. Condensed matter, 2020-08, Vol.32 (36)
issn 1361-648X
language eng
recordid cdi_proquest_miscellaneous_2398639689
source Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)
title Robust room temperature emissions of trion in darkish WSe2monolayers: effects of dark neutral and charged excitonic states
url http://sfxeu10.hosted.exlibrisgroup.com/loughborough?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-31T22%3A11%3A39IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=Robust%20room%20temperature%20emissions%20of%20trion%20in%20darkish%20WSe2monolayers:%20effects%20of%20dark%20neutral%20and%20charged%20excitonic%20states&rft.jtitle=Journal%20of%20physics.%20Condensed%20matter&rft.au=Riche,%20Flavio&rft.date=2020-08-26&rft.volume=32&rft.issue=36&rft.eissn=1361-648X&rft_id=info:doi/10.1088/1361-648X/ab8fd4&rft_dat=%3Cproquest%3E2398639689%3C/proquest%3E%3Cgrp_id%3Ecdi_FETCH-LOGICAL-p188t-808ec437571cd6f4df73f047106f6969941e0ae09992c450966a2acb294616223%3C/grp_id%3E%3Coa%3E%3C/oa%3E%3Curl%3E%3C/url%3E&rft_id=info:oai/&rft_pqid=2398639689&rft_id=info:pmid/&rfr_iscdi=true