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, 2023Scientists 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 |
| Related News Press |
News and information
Quantum computer improves AI predictions April 17th, 2026
Flexible sensor gains sensitivity under pressure April 17th, 2026
A reusable chip for particulate matter sensing April 17th, 2026
Detecting vibrational quantum beating in the predissociation dynamics of SF6 using time-resolved photoelectron spectroscopy April 17th, 2026
2 Dimensional Materials
Flexible sensor gains sensitivity under pressure April 17th, 2026
Quantum Physics
Detecting vibrational quantum beating in the predissociation dynamics of SF6 using time-resolved photoelectron spectroscopy April 17th, 2026
Possible Futures
A fundamentally new therapeutic approach to cystic fibrosis: Nanobody repairs cellular defect April 17th, 2026
UC Irvine physicists discover method to reverse ‘quantum scrambling’ : The work addresses the problem of information loss in quantum computing system April 17th, 2026
Chip Technology
A reusable chip for particulate matter sensing April 17th, 2026
Metasurfaces smooth light to boost magnetic sensing precision January 30th, 2026
Optical computing/Photonic computing
ICFO researchers overcome long-standing bottleneck in single photon detection with twisted 2D materials August 8th, 2025
Programmable electron-induced color router array May 14th, 2025
Discoveries
Quantum computer improves AI predictions April 17th, 2026
Flexible sensor gains sensitivity under pressure April 17th, 2026
A reusable chip for particulate matter sensing April 17th, 2026
Detecting vibrational quantum beating in the predissociation dynamics of SF6 using time-resolved photoelectron spectroscopy April 17th, 2026
Announcements
A fundamentally new therapeutic approach to cystic fibrosis: Nanobody repairs cellular defect April 17th, 2026
UC Irvine physicists discover method to reverse ‘quantum scrambling’ : The work addresses the problem of information loss in quantum computing system April 17th, 2026
Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters
A fundamentally new therapeutic approach to cystic fibrosis: Nanobody repairs cellular defect April 17th, 2026
UC Irvine physicists discover method to reverse ‘quantum scrambling’ : The work addresses the problem of information loss in quantum computing system April 17th, 2026
Photonics/Optics/Lasers
Metasurfaces smooth light to boost magnetic sensing precision January 30th, 2026
From sensors to smart systems: the rise of AI-driven photonic noses January 30th, 2026
Quantum nanoscience
Beyond silicon: Electronics at the scale of a single molecule January 30th, 2026
MXene nanomaterials enter a new dimension Multilayer nanomaterial: MXene flakes created at Drexel University show new promise as 1D scrolls January 30th, 2026
ICFO researchers overcome long-standing bottleneck in single photon detection with twisted 2D materials August 8th, 2025
 |
||
 |
||
| The latest news from around the world, FREE | ||
 |
||
|
|
||
| Premium Products | ||
 |
||
|
Only the news you want to read!
Learn More |
||
 |
||
|
Full-service, expert consulting
Learn More |
||
|
|
||