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Polaronic Trions Induced by Strong Interfacial Coupling in Monolayer WSe2

Wang, Yao ; Liu, Chaocheng ; Duan, Hengli ; Li, Zhi ; Wang, Chao ; Feng, Sihua ; Liu, Ruiqi ; Hu, Fengchun ; Jia, Hongfeng and Yu, Huabin , et al. (2023) In Advanced Electronic Materials 9(2).
Abstract

The weak dielectric screening in 2D semiconducting transition metal dichalcogenides give rise to strongly bound quasiparticles, which provides a platform to investigate the diverse excitonic phenomena and correlated physics. However, how to effectively control these quasiparticles is still a challenge for their applications in optoelectronic and valleytronic devices. Herein, by means of fabricating monolayer WSe2 and transition metal oxide (TMO) heterostructures, polaronic trion, that is a trion dressed with soft rotational optical (RO) phonons, is realized due to the strong interfacial coupling. This Fröhlich bound state of trion dramatically increases the trion binding energy (BE) from room temperature to 65 meV at 80 K in... (More)

The weak dielectric screening in 2D semiconducting transition metal dichalcogenides give rise to strongly bound quasiparticles, which provides a platform to investigate the diverse excitonic phenomena and correlated physics. However, how to effectively control these quasiparticles is still a challenge for their applications in optoelectronic and valleytronic devices. Herein, by means of fabricating monolayer WSe2 and transition metal oxide (TMO) heterostructures, polaronic trion, that is a trion dressed with soft rotational optical (RO) phonons, is realized due to the strong interfacial coupling. This Fröhlich bound state of trion dramatically increases the trion binding energy (BE) from room temperature to 65 meV at 80 K in WSe2/LaAlO3 (LAO). However, the increase of the trion BE for WSe2/SrTiO3 (STO) occurs below the phase transition temperature. This work expands the possibilities of the TMDs/TMOs heterostructures and promotes the development of 2D van der Waals materials for quasiparticle-based devices.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
heterostructures, interfacial interaction, monolayer WSe, photoluminescence, polaronic trions
in
Advanced Electronic Materials
volume
9
issue
2
publisher
Wiley-Blackwell
external identifiers
  • scopus:85142359823
ISSN
2199-160X
DOI
10.1002/aelm.202200852
language
English
LU publication?
yes
id
0e483a57-6b1a-4a04-b3b7-65f6299e0db8
date added to LUP
2023-01-03 12:42:15
date last changed
2023-10-26 15:03:55
@article{0e483a57-6b1a-4a04-b3b7-65f6299e0db8,
  abstract     = {{<p>The weak dielectric screening in 2D semiconducting transition metal dichalcogenides give rise to strongly bound quasiparticles, which provides a platform to investigate the diverse excitonic phenomena and correlated physics. However, how to effectively control these quasiparticles is still a challenge for their applications in optoelectronic and valleytronic devices. Herein, by means of fabricating monolayer WSe<sub>2</sub> and transition metal oxide (TMO) heterostructures, polaronic trion, that is a trion dressed with soft rotational optical (RO) phonons, is realized due to the strong interfacial coupling. This Fröhlich bound state of trion dramatically increases the trion binding energy (BE) from room temperature to 65 meV at 80 K in WSe<sub>2</sub>/LaAlO<sub>3</sub> (LAO). However, the increase of the trion BE for WSe<sub>2</sub>/SrTiO<sub>3</sub> (STO) occurs below the phase transition temperature. This work expands the possibilities of the TMDs/TMOs heterostructures and promotes the development of 2D van der Waals materials for quasiparticle-based devices.</p>}},
  author       = {{Wang, Yao and Liu, Chaocheng and Duan, Hengli and Li, Zhi and Wang, Chao and Feng, Sihua and Liu, Ruiqi and Hu, Fengchun and Jia, Hongfeng and Yu, Huabin and Zhu, Lin and Niu, Yuran and Zakharov, Alexei A. and Sun, Haiding and Yan, Wensheng}},
  issn         = {{2199-160X}},
  keywords     = {{heterostructures; interfacial interaction; monolayer WSe; photoluminescence; polaronic trions}},
  language     = {{eng}},
  number       = {{2}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Advanced Electronic Materials}},
  title        = {{Polaronic Trions Induced by Strong Interfacial Coupling in Monolayer WSe<sub>2</sub>}},
  url          = {{http://dx.doi.org/10.1002/aelm.202200852}},
  doi          = {{10.1002/aelm.202200852}},
  volume       = {{9}},
  year         = {{2023}},
}