Nature Search

Driving Floquet physics with excitonic fields

Floquet engineering is often limited by weak light–matter coupling and heating. Now it is shown that exciton-driven fields in monolayer semiconductors produce stronger, longer-lived Floquet effects and reveal hybridization linked to excitonic phases.

Vivek Pareek
David R. Bacon
Keshav M. Dani
Research19 Jan 2026
Nature Physics

P: 1-9
A holistic view of the dynamics of long-lived valley polarized dark excitonic states in monolayer WS₂

The authors showcase the capabilities of time-resolved momentum microscopy to image spin- and valley-resolved excitons in monolayer WS₂ with high energy resolution, revealing distinct long-lived, valley-polarized dark excitons that dominate at different timescales.

Xing Zhu
David R. Bacon
Keshav M. Dani
ResearchOpen Access10 Jul 2025
Nature Communications

Volume: 16, P: 1-8
Jahn-Teller-induced femtosecond electronic depolarization dynamics of the nitrogen-vacancy defect in diamond

Understanding ultrafast dynamics of excited states of nitrogen-vacancy helps its manipulation for technological applications. Here the authors use polarization anisotropy spectroscopy and molecular dynamics to investigate sub-picosecond dephasing dynamics, identifying the origin of orbital averaging effects.

Ronald Ulbricht
Shuo Dong
Zhi-Heng Loh
ResearchOpen Access16 Nov 2016
Nature Communications

Volume: 7, P: 1-6
Floquet states in graphene revealed at last

Time-resolved photoemission shows evidence of Floquet states in graphene, resolving a long-standing debate and unlocking engineering of quantum phases with light in semi-metals.

Julien Madéo
Keshav M. Dani
News & Views19 Jun 2025
Nature Physics

Volume: 21, P: 1040-1041
Local nanoscale phase impurities are degradation sites in halide perovskites

A multimodal microscopy toolkit reveals nanoscale defect clusters in halide perovskite films and that these clusters are sites at which photochemical degradation seeds.

Stuart Macpherson
Tiarnan A. S. Doherty
Samuel D. Stranks
Research24 May 2022
Nature

Volume: 607, P: 294-300
Structure of the moiré exciton captured by imaging its electron and hole

Imaging the electron and hole that bind to form interlayer excitons in a 2D moiré material enables direct measurement of its diameter and indicates the localization of its centre of mass.

Ouri Karni
Elyse Barré
Keshav M. Dani
Research09 Mar 2022
Nature

Volume: 603, P: 247-252
Nanoscale chemical heterogeneity dominates the optoelectronic response of alloyed perovskite solar cells

A combination of quantitative optical spectroscopic techniques and synchrotron nanoprobe measurements enable a visualization of the nanoscale chemical, structural and optoelectronic landscape in halide perovskite devices.

Kyle Frohna
Miguel Anaya
Samuel D. Stranks
Research22 Nov 2021
Nature Nanotechnology

Volume: 17, P: 190-196
Ultrafast Intrinsic Photoresponse and Direct Evidence of Sub-gap States in Liquid Phase Exfoliated MoS₂Thin Films

Sujoy Ghosh
Andrew Winchester
Saikat Talapatra
ResearchOpen Access15 Jul 2015
Scientific Reports

Volume: 5, P: 1-8
Observing the interplay between surface and bulk optical nonlinearities in thin van der Waals crystals

Skylar Deckoff-Jones
Jingjing Zhang
Keshav M. Dani
ResearchOpen Access03 Mar 2016
Scientific Reports

Volume: 6, P: 1-7
Mimicking subsecond neurotransmitter dynamics with femtosecond laser stimulated nanosystems

Takashi Nakano
Catherine Chin
Keshav M. Dani
ResearchOpen Access23 Jun 2014
Scientific Reports

Volume: 4, P: 1-6
Performance-limiting nanoscale trap clusters at grain junctions in halide perovskites

Photoemission electron microscopy images of trap states in halide peroskites, spatially correlated with their structural and compositional factors, may help in managing power losses in optoelectronic applications.

Tiarnan A. S. Doherty
Andrew J. Winchester
Samuel D. Stranks
Research15 Apr 2020
Nature

Volume: 580, P: 360-366
Harmonic generation in confinement

Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.

Julien Madéo
Keshav M. Dani
News & Views23 Jun 2022
Nature Physics

Volume: 18, P: 855-856
Imaging the motion of electrons across semiconductor heterojunctions

The flow of photoexcited electrons in a type-II heterostructure can be imaged with energy, spatial and temporal resolution.

Michael K. L. Man
Athanasios Margiolakis
Keshav M. Dani
Research10 Oct 2016
Nature Nanotechnology

Volume: 12, P: 36-40
Protecting the properties of monolayer MoS₂ on silicon based substrates with an atomically thin buffer

Michael K. L. Man
Skylar Deckoff-Jones
Keshav M. Dani
ResearchOpen Access12 Feb 2016
Scientific Reports

Volume: 6, P: 1-9

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