Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses

Omri Meron; Uri Arieli; Eyal Bahar; Swarup Deb; Moshe Ben Shalom; Haim Suchowski

doi:10.1038/s41377-025-01748-7

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Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses

Original Articles

- Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses
- Light: Science & Applications Vol. 14, Issue 3, Pages: 831-838(2025)
- Affiliations：
  
  1.School of Physics and Astronomy, Faculty of Exact Sciences, Tel Aviv University, Tel‐Aviv 6997801, Israel
  2.Center for Light‐Matter Interaction, Tel Aviv University, Tel‐Aviv 6997801, Israel
- Author bio：
  
  Omri Meron (omrimeron@tauex.tau.ac.il)
- Funds：
- DOI：10.1038/s41377-025-01748-7
  CLC：
- Received：29 August 2024，
  
  Revised：14 November 2024，
  
  Accepted：2025-01-06，
  
  Published Online：11 February 2025，
  
  Published：31 March 2025
- Accepted：
Scan QR Code
Meron, O. et al. Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses. Light: Science & Applications, 14, 831-838 (2025).
DOI：

Meron, O. et al. Shaping exciton polarization dynamics in 2D semiconductors by tailored ultrafast pulses. Light: Science & Applications, 14, 831-838 (2025). DOI： 10.1038/s41377-025-01748-7.

摘要

Abstract

The ultrafast formation of strongly bound excitons in two-dimensional semiconductors provides a rich platform for studying fundamental physics as well as developing novel optoelectronic technologies. While extensive research has explored the excitonic coherence

many-body interactions

and nonlinear optical properties

the potential to study these phenomena by directly controlling their coherent polarization dynamics has not been fully realized. In this work

we use a sub-10 fs pulse shaper to study how temporal control of coherent exciton polarization affects the generation of four-wave mixing in monolayer WSe

under ambient conditions. By tailoring multiphoton pathway interference

we tune the nonlinear response from d

estructive to constructive interference

resulting in a 2.6-fold enhancement over the four-wave mixing generated by a transform-limited pulse. This demonstrates a general method for nonlinear enhancement by shaping the pulse to counteract the temporal dispersion experienced during resonant light–matter interactions. Our method allows us to excite both 1s and 2s states

showcasing a selective control over the resonant state that produces nonlinearity. By comparing our results with theory

we find that exciton-exciton interactions dominate the nonlinear response

rather than Pauli blocking. This capability to manipulate exciton polarization dynamics in atomically thin crystals lays the groundwork for exploring a wide range of resonant phenomena in condensed matter systems and opens up new possibilities for precise optical control in advanced optoelectronic devices.

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Keywords

references

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