New study opens the door to ultrafast 2D devices that use nonequilibrium exciton superdiffusion

Home > Press > New study opens the door to ultrafast 2D devices that use nonequilibrium exciton superdiffusion

New study opens the door to ultrafast 2D devices that use nonequilibrium exciton superdiffusion CREDIT Ultrafast Science

Abstract:
Bound electron-hole pairs, or excitons, are working horses in the layered transition metal dichalcogenide semiconductors. Like the negative and positive charge carriers from which it forms, the exciton exhibits great mobility that ultrafast transient diffusion is required for ultrafast information processes.

New study opens the door to ultrafast 2D devices that use nonequilibrium exciton superdiffusion

Shanghai, China | Posted on February 10th, 2023

Scientists at Tsinghua have been able to directly observe the ultrafast motion of nonequilibrium exciton in monolayers WSe2, MoWSe2, and MoSe2, immediately after they are excited with a femtosecond laser with the home-built pump-probe microscope—and it is found that these excitons travel at least 200 nm within 1 ps, much faster than previously expected.

“Generally, exciton diffusion is a linear process driven by the population gradient, where excitons migrate from high concentration region to low concentration region,” says Zhou at Tsinghua University. “We observe that exciton diffuses much faster than expected at the early time, we call it superdiffusion.”

Superdiffusion occurs in very short time scales. The effective diffusivity coefficient of this process can reach up to 102 - 103 cm2 s−1. This super-diffusive behavior improves the spatial migration of excitons, which is expected to break the traditional limitation of photovoltaic efficiency, or could be used for ultrafast electronic devices due to its nature of ultrashort time scales.

This work is helpful to better understand the ultrafast nonlinear diffusive behavior in strongly quantum-confined systems. It may be harnessed to break the limit of conventional slow diffusion of excitons for advancing more efficient and ultrafast optoelectronic devices.

This work is financially supported by the National Natural Science Foundation of China (no. 62075115) and the Tsinghua University Initiative Scientific Research Program.

####

For more information, please click here

Contacts:
Jiangbo She
Ultrafast Science

Copyright © Ultrafast Science

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:

Related Links

ARTICLE TITLE

Related News Press

News and information

Graphene Flagship start-up Bedimensional closes a second €10 million investment round February 10th, 2023

Progress toward fast-charging lithium-metal batteries: By growing uniform lithium crystals on a surprising surface, UC San Diego engineers open a new door to fast-charging lithium-metal batteries February 10th, 2023

Beyond lithium: a promising cathode material for magnesium rechargeable batteries: Scientists discover the optimal composition for a magnesium secondary battery cathode to achieve better cyclability and high battery capacity February 10th, 2023

Make them thin enough, and antiferroelectric materials become ferroelectric February 10th, 2023

Quantum Physics

Scientists boost quantum signals while reducing noise: “Squeezing” noise over a broad frequency bandwidth in a quantum system could lead to faster and more accurate quantum measurements February 10th, 2023

2 Dimensional Materials

Ultrathin vanadium oxychloride demonstrates strong optical anisotropic properties Two-dimensional material could make novel strain sensors, photodetectors and other nanodevices a reality January 6th, 2023

Wafer-scale 2D MoTe₂ layers enable highly-sensitive broadband integrated infrared detector January 6th, 2023

Team undertakes study of two-dimensional transition metal chalcogenides Important biomedical application, including biosensing December 9th, 2022

Experimental nanosheet material marks a step toward the next generation of low-power, high-performance electronics December 9th, 2022

Possible Futures

Scientists boost quantum signals while reducing noise: “Squeezing” noise over a broad frequency bandwidth in a quantum system could lead to faster and more accurate quantum measurements February 10th, 2023

Progress toward fast-charging lithium-metal batteries: By growing uniform lithium crystals on a surprising surface, UC San Diego engineers open a new door to fast-charging lithium-metal batteries February 10th, 2023

Beyond lithium: a promising cathode material for magnesium rechargeable batteries: Scientists discover the optimal composition for a magnesium secondary battery cathode to achieve better cyclability and high battery capacity February 10th, 2023

Make them thin enough, and antiferroelectric materials become ferroelectric February 10th, 2023

Chip Technology

Manufacturing advances bring material back in vogue January 20th, 2023

Vertical electrochemical transistor pushes wearable electronics forward: Biomedical sensing is one application of efficient, low-cost transistors January 20th, 2023

Towards highly conducting molecular materials with a partially oxidized organic neutral molecule: In an unprecedented feat, researchers from Japan develop an organic, air-stable, highly conducting neutral molecular crystal with unique electronic properties January 20th, 2023

Approaching the terahertz regime: Room temperature quantum magnets switch states trillions of times per second January 20th, 2023

Optical computing/Photonic computing

Photonic Materials: Recent Advances and Emerging Applications February 10th, 2023

Manufacturing advances bring material back in vogue January 20th, 2023

New X-ray imaging technique to study the transient phases of quantum materials December 29th, 2022

Experimental nanosheet material marks a step toward the next generation of low-power, high-performance electronics December 9th, 2022

Discoveries

Scientists boost quantum signals while reducing noise: “Squeezing” noise over a broad frequency bandwidth in a quantum system could lead to faster and more accurate quantum measurements February 10th, 2023

Progress toward fast-charging lithium-metal batteries: By growing uniform lithium crystals on a surprising surface, UC San Diego engineers open a new door to fast-charging lithium-metal batteries February 10th, 2023

Beyond lithium: a promising cathode material for magnesium rechargeable batteries: Scientists discover the optimal composition for a magnesium secondary battery cathode to achieve better cyclability and high battery capacity February 10th, 2023

Make them thin enough, and antiferroelectric materials become ferroelectric February 10th, 2023

Announcements

Graphene Flagship start-up Bedimensional closes a second €10 million investment round February 10th, 2023

Fiber sensing scientists invent 3D printed fiber microprobe for measuring in vivo biomechanical properties of tissue and even single cell February 10th, 2023

Photonic Materials: Recent Advances and Emerging Applications February 10th, 2023

Make them thin enough, and antiferroelectric materials become ferroelectric February 10th, 2023

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Scientists boost quantum signals while reducing noise: “Squeezing” noise over a broad frequency bandwidth in a quantum system could lead to faster and more accurate quantum measurements February 10th, 2023

Progress toward fast-charging lithium-metal batteries: By growing uniform lithium crystals on a surprising surface, UC San Diego engineers open a new door to fast-charging lithium-metal batteries February 10th, 2023

Beyond lithium: a promising cathode material for magnesium rechargeable batteries: Scientists discover the optimal composition for a magnesium secondary battery cathode to achieve better cyclability and high battery capacity February 10th, 2023

Make them thin enough, and antiferroelectric materials become ferroelectric February 10th, 2023

Photonics/Optics/Lasers

Photonic Materials: Recent Advances and Emerging Applications February 10th, 2023

Quantum sensors see Weyl photocurrents flow: Boston College-led team develops new quantum sensor technique to image and understand the origin of photocurrent flow in Weyl semimetals January 27th, 2023

Manufacturing advances bring material back in vogue January 20th, 2023

Researchers demonstrate co-propagation of quantum and classical signals: Study shows that quantum encryption can be implemented in existing fiber networks January 20th, 2023

Quantum nanoscience

Scientists boost quantum signals while reducing noise: “Squeezing” noise over a broad frequency bandwidth in a quantum system could lead to faster and more accurate quantum measurements February 10th, 2023

Quantum sensors see Weyl photocurrents flow: Boston College-led team develops new quantum sensor technique to image and understand the origin of photocurrent flow in Weyl semimetals January 27th, 2023

Department of Energy announces $9.1 million for research on quantum information science and nuclear physics: Projects span the development of quantum computing, algorithms, simulators, superconducting qubits, and quantum sensors for advancing nuclear physics January 27th, 2023

Danish quantum physicists make nanoscopic advance of colossal significance January 27th, 2023

• SEO Powered Content & PR Distribution. Get Amplified Today.
• Platoblockchain. Web3 Metaverse Intelligence. Knowledge Amplified. Access Here.
• Source: http://www.nanotech-now.com/news.cgi?story_id=57301