Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2
The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron–hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excito...
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| Veröffentlicht in: | Nano letters 2016-08, Vol.16 (8), p.5109-5113 |
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| container_title | Nano letters |
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| creator | Hao, Kai Xu, Lixiang Nagler, Philipp Singh, Akshay Tran, Kha Dass, Chandriker Kavir Schüller, Christian Korn, Tobias Li, Xiaoqin Moody, Galan |
| description | The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron–hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excitons may be relevant through exciton–trion coupling and conversion phenomena. In this work, we reveal the coherent and incoherent nature of exciton–trion coupling and the relevant time scales in monolayer MoSe2 using optical two-dimensional coherent spectroscopy. Coherent interaction between excitons and trions is definitively identified as quantum beating of cross peaks in the spectra that persists for a few hundred femtoseconds. For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature. |
| doi_str_mv | 10.1021/acs.nanolett.6b02041 |
| format | Article |
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For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature.</description><subject>MATERIALS SCIENCE</subject><subject>phonons</subject><subject>spin dynamics</subject><subject>spintronics</subject><subject>thermal conductivity</subject><subject>thermoelectric</subject><issn>1530-6984</issn><issn>1530-6992</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNpVUU1PGzEQtSpQ-Wj_QVWtOHFJGNv7YV8qoSUUJKCHtmfLaw-J0cZO115o_n2dJkFwmhnPm-c38wj5QmFKgdELbeLUax96TGlad8CgpB_IMa04TGop2cFrLsojchLjEwBIXsFHcsSakokK5DHRbVjggD4V2tvi1pt92YZx1Ts_L67WXi-diUWH6QXRFw84pkH3_wfahR7maIvZX-NS8LFwvrgPWZRe45Czn8g-kcNH3Uf8vIun5Pf17Fd7M7n78f22vbybaC4gTaTu6s42WAphULCmlga5pcKwTogObFU21jZcciobFFBrS5FapPgI2EFF-Sn5tuVdjd0SrclLZJVqNbilHtYqaKfed7xbqHl4VlUlecmqTHC2JQgxORXzQmgWJniPJinKhZCMZ9D57pch_BkxJrV00WDfa49hjIoKCqKuOWygX98KelWyP34GwBaQrVRPYRx8vo-ioDb-qs3j3l-185f_A440mzw</recordid><startdate>20160810</startdate><enddate>20160810</enddate><creator>Hao, Kai</creator><creator>Xu, Lixiang</creator><creator>Nagler, Philipp</creator><creator>Singh, Akshay</creator><creator>Tran, Kha</creator><creator>Dass, Chandriker Kavir</creator><creator>Schüller, Christian</creator><creator>Korn, Tobias</creator><creator>Li, Xiaoqin</creator><creator>Moody, Galan</creator><general>American Chemical Society</general><scope>NPM</scope><scope>7X8</scope><scope>OIOZB</scope><scope>OTOTI</scope><scope>5PM</scope></search><sort><creationdate>20160810</creationdate><title>Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2</title><author>Hao, Kai ; Xu, Lixiang ; Nagler, Philipp ; Singh, Akshay ; Tran, Kha ; Dass, Chandriker Kavir ; Schüller, Christian ; Korn, Tobias ; Li, Xiaoqin ; Moody, Galan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a380t-9ab6bd7e488ce82769ce3d18c2b88b0d547dd7393197e806ad1e1de1ef0eb0513</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>MATERIALS SCIENCE</topic><topic>phonons</topic><topic>spin dynamics</topic><topic>spintronics</topic><topic>thermal conductivity</topic><topic>thermoelectric</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hao, Kai</creatorcontrib><creatorcontrib>Xu, Lixiang</creatorcontrib><creatorcontrib>Nagler, Philipp</creatorcontrib><creatorcontrib>Singh, Akshay</creatorcontrib><creatorcontrib>Tran, Kha</creatorcontrib><creatorcontrib>Dass, Chandriker Kavir</creatorcontrib><creatorcontrib>Schüller, Christian</creatorcontrib><creatorcontrib>Korn, Tobias</creatorcontrib><creatorcontrib>Li, Xiaoqin</creatorcontrib><creatorcontrib>Moody, Galan</creatorcontrib><creatorcontrib>Energy Frontier Research Centers (EFRC) (United States). 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Spins and Heat in Nanoscale Electronic Systems (SHINES)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2</atitle><jtitle>Nano letters</jtitle><addtitle>Nano Lett</addtitle><date>2016-08-10</date><risdate>2016</risdate><volume>16</volume><issue>8</issue><spage>5109</spage><epage>5113</epage><pages>5109-5113</pages><issn>1530-6984</issn><eissn>1530-6992</eissn><abstract>The optical properties of semiconducting transition metal dichalcogenides are dominated by both neutral excitons (electron–hole pairs) and charged excitons (trions) that are stable even at room temperature. While trions directly influence charge transport properties in optoelectronic devices, excitons may be relevant through exciton–trion coupling and conversion phenomena. In this work, we reveal the coherent and incoherent nature of exciton–trion coupling and the relevant time scales in monolayer MoSe2 using optical two-dimensional coherent spectroscopy. Coherent interaction between excitons and trions is definitively identified as quantum beating of cross peaks in the spectra that persists for a few hundred femtoseconds. For longer times up to 10 ps, surprisingly, the relative intensity of the cross peaks increases, which is attributed to incoherent energy transfer likely due to phonon-assisted up-conversion and down-conversion processes that are efficient even at cryogenic temperature.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>27428509</pmid><doi>10.1021/acs.nanolett.6b02041</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
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| source | ACS Publications |
| subjects | MATERIALS SCIENCE phonons spin dynamics spintronics thermal conductivity thermoelectric |
| title | Coherent and Incoherent Coupling Dynamics between Neutral and Charged Excitons in Monolayer MoSe2 |
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