scholarly journals Layer-engineered interlayer excitons

2021 ◽  
Vol 7 (30) ◽  
pp. eabh0863
Author(s):  
Qinghai Tan ◽  
Abdullah Rasmita ◽  
Si Li ◽  
Sheng Liu ◽  
Zumeng Huang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Band Structure ◽  
Optoelectronic Property ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Multilayer Heterostructures ◽  
Valley Polarization ◽  
Band Transition ◽  
The Way

Photoluminescence (PL) from excitons serves as a powerful tool to characterize the optoelectronic property and band structure of semiconductors, especially for atomically thin two-dimensional transition metal dichalcogenide (TMD) materials. However, PL quenches quickly when the thickness of TMD materials increases from monolayer to a few layers, due to the change from direct to indirect band transition. Here, we show that PL can be recovered by engineering multilayer heterostructures, with the band transition reserved to be a direct type. We report emission from layer-engineered interlayer excitons from these multilayer heterostructures. Moreover, as desired for valleytronics devices, the lifetime, valley polarization, and valley lifetime of the generated interlayer excitons can all be substantially improved as compared with that in the monolayer-monolayer heterostructure. Our results pave the way for controlling the properties of interlayer excitons by layer engineering.

scholarly journals Valley Orientation of Electrons and Excitons in Atomically Thin Transition Metal Dichalcogenide Monolayers (Brief Review)

JETP Letters ◽  
2021 ◽  
Vol 113 (1) ◽  
pp. 7-17
Author(s):  
M. M. Glazov ◽  
E. L. Ivchenko
Keyword(s):  
Transition Metal ◽  
Band Structure ◽  
Second Harmonic ◽  
Polarized Light ◽  
Charge Carriers ◽  
Photon Absorption ◽  
Transition Metal Dichalcogenide ◽  
Optical Orientation ◽  
Circularly Polarized Light ◽  
Valley Polarization

The main aspects of physical phenomena associated with the optical orientation of the spin and valley degrees of freedom in transition metal dichalcogenide monolayers and in van der Waals heterostructures based on them have been briefly reviewed. Owing to features of the band structure and spin–orbit coupling in such systems, circularly polarized light induces optical transitions in different valleys K+ and K– of the Brillouin zone; consequently, the optical orientation of charge carriers and excitons is accompanied by their valley polarization. The main features of the band structure of transition metal dichalcogenide monolayers, excitonic effects, and results of theoretical studies of the valley orientation of excitons and electrons at one-photon absorption have been reported. The linear–circular dichroism and valley orientation of free charge carriers and excitons at multiphoton absorption have been studied. Effects associated with the trigonal symmetry of monolayers, including the inversion of valley polarization at two-photon transitions and the second harmonic generation, have been discussed. The considered theoretical models have been illustrated by experimental data.

scholarly journals Visualization of Multifractal Superconductivity in a Two-Dimensional Transition Metal Dichalcogenide in the Weak-Disorder Regime

Nano Letters ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 5111-5118 ◽  
Author(s):  
Carmen Rubio-Verdú ◽  
Antonio M. Garcı́a-Garcı́a ◽  
Hyejin Ryu ◽  
Deung-Jang Choi ◽  
Javier Zaldı́var ◽  
...  
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Weak Disorder

scholarly journals Retraction: Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12866-12866
Author(s):  
Bhaskar Kaviraj ◽  
Dhirendra Sahoo
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional

Retraction of ‘Physics of excitons and their transport in two dimensional transition metal dichalcogenide semiconductors’ by Bhaskar Kaviraj and Dhirendra Sahoo, RSC Adv., 2019, 9, 25439–25461, DOI: 10.1039/c9ra03769a.

scholarly journals Fast response photogating in monolayer MoS2 phototransistors

Nanoscale ◽  
2021 ◽  
Author(s):  
Daniel Vaquero ◽  
Vito Clericò ◽  
Juan Salvador-Sanchez ◽  
Elena Díaz ◽  
Francisco Dominguez-Adame ◽  
...  
Keyword(s):  
Transition Metal ◽  
Fast Response ◽  
Transition Metal Dichalcogenide ◽  
Two Dimensional ◽  
Monolayer Mos2 ◽  
Intensive Research

Two-dimensional transition metal dichalcogenide (TMD) phototransistors have been object of intensive research during the last years due to their potential for photodetection. Photoresponse in these devices is typically caused by...

Negative Valley Polarization in Doped Monolayer MoSe2

2021 ◽  
Author(s):  
Yueh-Chun Wu ◽  
Takashi Taniguchi ◽  
Kenji Watanabe ◽  
Jun Yan
Keyword(s):  
Transition Metal ◽  
Transition Metal Dichalcogenide ◽  
Optical Generation ◽  
Valley Polarization

Monolayer molybdenum di-selenide (1L-MoSe2) stands out in the transition metal dichalcogenide family of materials as an outlier where optical generation of valley polarization is inefficient. Here we show that using...

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