scholarly journals Moiré excitons in defective van der Waals heterostructures

2021 ◽  
Vol 118 (32) ◽  
pp. e2105468118
Author(s):  
Hongli Guo ◽  
Xu Zhang ◽  
Gang Lu
Keyword(s):  
Electric Fields ◽  
Single Photon ◽  
Van Der Waals ◽  
Energy Charge ◽  
Defect Engineering ◽  
One Dimensional ◽  
Competition And Cooperation ◽  
Ordered Arrays ◽  
Promising Strategy ◽  
Single Photon Emitters

Excitons can be trapped by moiré potentials in van der Waals (vdW) heterostructures, forming ordered arrays of quantum dots. Excitons can also be trapped by defect potentials as single photon emitters. While the moiré and defect potentials in vdW heterostructures have been studied separately, their interplay remains largely unexplored. Here, we perform first-principles calculations to elucidate the interplay of the two potentials in determining the optoelectronic properties of twisted MoS2/WS2 heterobilayers. The binding energy, charge density, localization, and hybridization of the moiré excitons can be modulated by the competition and cooperation of the two potentials. Their interplay can also be tuned by vertical electric fields, which can either de-trap the excitons or strongly localize them. One can further tailor the interplay of the two potentials via defect engineering to create one-dimensional exciton lattices with tunable orientations. Our work establishes defect engineering as a promising strategy to realize on-demand optoelectronic responses.

scholarly journals Ordered arrays of InGaN/GaN dot-in-a-wire nanostructures as single photon emitters

2015 ◽  
Author(s):  
Snežana Lazić ◽  
Ekaterina Chernysheva ◽  
Žarko Gačević ◽  
Noemi García-Lepetit ◽  
Herko P. van der Meulen ◽  
...  
Keyword(s):  
Single Photon ◽  
Ordered Arrays ◽  
Single Photon Emitters

Interfacing single-photon emitters in atomically thin van der Waals crystals with photonic metasurfaces (Conference Presentation)

2019 ◽  
Author(s):  
Pankaj K. Jha ◽  
Ghazaleh K. Shirmanesh ◽  
Anna Mitskovets ◽  
Arun Nagpal ◽  
Hamidreza Akbari ◽  
...  
Keyword(s):  
Single Photon ◽  
Van Der Waals ◽  
Single Photon Emitters

scholarly journals Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure

2021 ◽  
Vol 7 (43) ◽  
Author(s):  
Jae-Pil So ◽  
Ha-Reem Kim ◽  
Hyeonjun Baek ◽  
Kwang-Yong Jeong ◽  
Hoo-Cheol Lee ◽  
...  
Keyword(s):  
Single Photon ◽  
Van Der Waals ◽  
Van Der Waals Heterostructure ◽  
Single Photon Emitters

scholarly journals Purely one-dimensional ferroelectricity and antiferroelectricity from van der Waals niobium oxide trihalides

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Lei Zhang ◽  
Cheng Tang ◽  
Stefano Sanvito ◽  
Aijun Du
Keyword(s):  
Electric Fields ◽  
Van Der Waals ◽  
Electronic Devices ◽  
Ferroelectric Materials ◽  
Channel Structure ◽  
One Dimensional ◽  
Ferroelectricity And Antiferroelectricity ◽  
Switching Barriers ◽  
Double Channel ◽  
Ferroelectric Switching

AbstractIntrinsic one-dimensional (1D) ferroelectric materials are rarely reported but are highly sought to break the size limit of nanostructured conventional ferroelectrics. Herein, we report a class of inborn 1D ferroelectric nanowires, namely 1D NbOX3 (X = Cl, Br, and I), that can be directly obtained from experimentally realized van der Waals crystals. In addition to the sizable spontaneous polarization, 1D NbOX3 exhibits low ferroelectric switching barriers, small coercive electric fields, and high critical temperature, governed by the hybridization of the Nb empty d orbitals and the O p orbitals (d0 rule). Moreover, the double-channel structure of 1D NbOX3 also enables the emergence of 1D antiferroelectric metastable states. Our findings not only propose a class of 1D ferroelectric materials toward the development of miniaturized and high-density electronic devices, but also pave an avenue of obtaining intrinsic 1D ferroelectrics from van der Waals crystals.

Single-photon emitters in van der Waals materials

2019 ◽  
Vol 17 (2) ◽  
pp. 020011 ◽  
Author(s):  
Jiandong Qiao Jiandong Qiao ◽  
Fuhong Mei Fuhong Mei ◽  
Yu Ye Yu Ye
Keyword(s):  
Single Photon ◽  
Van Der Waals ◽  
Single Photon Emitters ◽  
Van Der Waals Materials

scholarly journals Defect and strain engineering of monolayer WSe2 enables site-controlled single-photon emission up to 150 K

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kamyar Parto ◽  
Shaimaa I. Azzam ◽  
Kaustav Banerjee ◽  
Galan Moody
Keyword(s):  
Single Photon ◽  
Photon Emission ◽  
Strain Engineering ◽  
High Yield ◽  
Light Sources ◽  
Full Potential ◽  
Defect Engineering ◽  
Single Photon Emitters ◽  
On Chip ◽  
Micro Cavity

AbstractIn recent years, quantum-dot-like single-photon emitters in atomically thin van der Waals materials have become a promising platform for future on-chip scalable quantum light sources with unique advantages over existing technologies, notably the potential for site-specific engineering. However, the required cryogenic temperatures for the functionality of these sources has been an inhibitor of their full potential. Existing methods to create emitters in 2D materials face fundamental challenges in extending the working temperature while maintaining the emitter’s fabrication yield and purity. In this work, we demonstrate a method of creating site-controlled single-photon emitters in atomically thin WSe2 with high yield utilizing independent and simultaneous strain engineering via nanoscale stressors and defect engineering via electron-beam irradiation. Many of the emitters exhibit biexciton cascaded emission, single-photon purities above 95%, and working temperatures up to 150 K. This methodology, coupled with possible plasmonic or optical micro-cavity integration, furthers the realization of scalable, room-temperature, and high-quality 2D single- and entangled-photon sources.

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

scholarly journals First-Principles Identification of Single Photon Emitters Based on Carbon Clusters in Hexagonal Boron Nitride

2021 ◽  
Vol 125 (6) ◽  
pp. 1325-1335 ◽  
Author(s):  
Cesar Jara ◽  
Tomáš Rauch ◽  
Silvana Botti ◽  
Miguel A. L. Marques ◽  
Ariel Norambuena ◽  
...  
Keyword(s):  
Boron Nitride ◽  
First Principles ◽  
Single Photon ◽  
Hexagonal Boron Nitride ◽  
Carbon Clusters ◽  
Single Photon Emitters

scholarly journals High performance self-powered photodetector based on 1D Te-2D WS2 mixed-dimensional heterostructure

2021 ◽  
Author(s):  
Lixiang Han ◽  
Mengmeng Yang ◽  
Peiting Wen ◽  
Wei Gao ◽  
nengjie huo ◽  
...  
Keyword(s):  
High Performance ◽  
Van Der Waals ◽  
Sharp Interface ◽  
Two Dimensional ◽  
High Quality ◽  
One Dimensional ◽  
Self Powered

One dimensional (1D)-two dimensional (2D) van der Waals (vdWs) mixed-dimensional heterostructures with advantages of atomically sharp interface, high quality and good compatibility have attracted tremendous attention in recent years. The...

Sign in / Sign up

Export Citation Format

Share Document