# Columbia's stroboSCAT microscope separates single- and multi-particle transport in semiconductors

- Published: 2026-11-10 18:02 UTC
- Section: Science › Instruments & experiments
- Tags: stroboSCAT, intensity cycling, transient scattering microscopy, single-particle transport, exciton-exciton annihilation, van der Waals semiconductors, polaronic Mott transition, Milan Delor
- URL: https://realtech.media/news/rt-cfb1f9ad3ebdef76d52ac8a6_columbia_s_stroboscat/

**Intensity cycling in a transient scattering microscope lets researchers image single-particle and multi-particle transport separately in van der Waals semiconductors, the authors report.**

![Columbia's stroboSCAT microscope separates single- and multi-particle transport in semiconductors](https://realtech.media/media/2026/11/06876bd93b6efccf.jpg)
*science.mail.ru*

Chemist Milan Delor at Columbia University and colleagues have extended the stroboSCAT microscope so that it distinguishes single-particle from multi-particle quantum states of energy carriers. The results were published in Nature Materials [1]. The authors used transient scattering microscopy on van der Waals semiconductors and applied intensity cycling, a concept from multidimensional spectroscopy, to the spatiotemporal domain [1].

Spatiotemporal optical microscopies already image the propagation of electrons, excitons, magnons and polaritons. They give functional metrics that contact-based transport measurements cannot reach. However, they do not distinguish single-particle from multi-particle states, which hinders the study of many-body correlations [1].

## Intensity cycling and resolution

According to the science.mail.ru report on the work, cycling the light intensity isolates individual quantum states even at low carrier density and avoids interference from many-body interactions. The same report says the new version of stroboSCAT reaches femtosecond time resolution and spatial resolution of a few nanometers. The team followed electrons moving through a two-dimensional semiconductor and tracked how two- and three-particle states evolve.

## What the method imaged

The paper demonstrates several capabilities. These are clean isolation of single-particle charge transport with a high signal-to-noise ratio, spatiotemporal tracking of exciton-exciton annihilation, and high-throughput mapping of dielectric disorder [1]. The method also imaged the emergence of a polaronic Mott transition and correlated transport in a superatomic solid [1].

The authors describe the result as a precision tool for visualizing how many-body interactions shape material function [1]. According to the report, Delor shares the stroboSCAT blueprints and software so that other laboratories can adopt the method.

## Sources

1. [Nature Materials](https://doi.org/10.1038/s41563-026-02800-6)
2. [science.mail.ru](https://science.mail.ru/news/60287-mikroskop-nauchilsya-razlichat-otdelnye-kvantovye-nositeli-energii)

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Source: RealTech, realtech.media — https://realtech.media/news/rt-cfb1f9ad3ebdef76d52ac8a6_columbia_s_stroboscat/