31. Nie W, Blancon JC,  Neukirch AJ, Appavoo K, Tsai H, Chhowalla M, Alam MA, Sfeir MY, Katan C, Even J, Tretiak S, Crochet JJ, Gupta G and Mohite AD. Extremely efficient internal exciton dissociation through edge states in layered 2D perovskites in Science 2017.

30. Appavoo K, Nie W, Blancon JC, Even J, Mohite AD and MY Sfeir.  Ultrafast optical snapshots of hybrid perovskites reveal the origin of multiband electronic transitions in Physical Review B 2017.

29. Zhang W,  Yan D, Appavoo K, Cen J, Wu Q, Sfeir MY, and Liu M. Unravelling photocarrier dynamics beyond the space charge region for photoelectrochemical water splitting in Chemistry of Materials 2017.


28. Nie W, Blancon JC,  Neukirch AJ, Appavoo K, Tsai H, Chhowalla M, Alam MA, Sfeir MY, Katan C, Even J, Tretiak S, Crochet JJ, Gupta G and Mohite AD. Light-activated photocurrent degradation and self-healing in perovskite solar cells in Nature Communications 2016.

27. Neukirch AJ, Nie W, Blancon JC, Appavoo K, Tsai H, Sfeir MY, Katan C, Pedesseau L, Even J, Crochet JJ, Gupta G, Mohite AD and Tretiak S. Polaron Stabilization by Cooperative Lattice Distortion and Cation Rotations in Hybrid Perovskite Materials in Nano Letters 2016.

26. Appavoo K, Liu X, Menon V and Sfeir MY. Excitonic Lasing in Solution-Processed Subwavelength Nanosphere Assemblies in Nano Letters 2016.

25. Sanders SN, Kumarasamy E, Pun AB, Appavoo K, Steigerwald ML, Campos LM and Sfeir MY. Exciton Correlations in Intramolecular Singlet Fission in Journal of the American Chemical Society (JACS) 2016.

24. Brady NF, Appavoo K, Nag J, Seo, MN, Prasankumar RP, Haglund RF and Hilton DJ. Heterogeneous nucleation in the light-induced phase transition in vanadium dioxide in Journal of Condensed Matter Physics 2016.

2010 - 2015

23. Zeng C, Chen Y, Kirschbaum K, Appavoo K, Sfeir MY, Li T, Rosi N and Jin R. Ordering at all scales in the non-metallic 133-gold-atom nanoparticle  in Science Advances 2015 

22. Appavoo K, Liu M, Black CT, Sfeir MY. Quantifying bulk and surface recombination processes in nanostructured water splitting photocatalysts via in situ ultrafast spectroscopy in Nano Letters 2015 

21. Lei DY, Appavoo K, Ligmajer F, Sonnefraud Y, Haglund RF and S.A. Maier. Optically-Triggered Nanoscale Memory Effect in a Hybrid Plasmonic-Phase Changing Nanostructure in ACS Photonics 2015

20. Markov P, Appavoo K, Haglund RF and Weiss SM. Hybrid Si-VO2-Au Modulator based on near-field plasmonic coupling in Optics Express 2015 

19. Appavoo K, Liu X, Menon VM, Sfeir MY. Room-Temperature Exciton Lasing in Ultrathin Film of Coupled Nanocrystals in Postdeadline CLEO Science and Innovations 2015 

18. Appavoo K, Wang B, Nag J, Sfeir MY, Pantelides ST, Haglund RF, Doping-controlled coherent electron-phonon coupling in vanadium dioxide in CLEO Science and Innovations 2015 

17. Appavoo K, Liu M, Black CT, Sfeir MY. Decoupling bulk and surface contributions in water splitting Photocatalysts by in situ ultrafast spectroscopy in CLEO:QELSFundamental Science OSA Digest 2015

16. Appavoo K & Haglund RF. Polarization selective phase-change nanomodulator in Nature Scientific Reports 2014

15. Appavoo K & Sfeir MY. Enhanced broadband ultrafast detection of ultraviolet emission using optical Kerr gating. Review of Scientific Instruments 2014

> Cover Art

14. Appavoo K, Liu M, Sfeir MY. Role of size and defects in ultrafast broadband emission dynamics of ZnO nanostructures. Applied Physics Letters 2014 

13. Appavoo K, Wang B, Brady N, Seo M, Nag J, Pantelides ST, Prasankumar RP, Hilton DJ, Haglund RF. Ultrafast phase transition via catastrophic phonon collapse driven by plasmonic hot-electron injection. Nano Letters 2014 

> Featured in IEEE spectrumScience daily, VU, UABNanowerk and Kurzweil.

12. McGahan C, Appavoo K, Shapera EP and Haglund RF. Switchable plasmon-induced transparency in gold nanoarrays on vanadium dioxide filmJ. Vac. Sci. Technol. 2013

11. Appavoo K and Haglund RF. Polarization-Dependent Phase-Changing Nanoswitch.  CLEO:QELS Fundamental Science 2013

10. S. Wall, L. Foglia, D. Wegkamp, K. Appavoo, J. Nag, R. F. Haglund Jr, J. Stähler, M. Wolf. Tracking the evolution of electronic and structural properties of VO2 during the ultrafast photoinduced insulator-metal transitionPhys. Rev. B 2013

9. Marvel RE*, Appavoo K*, Choi BK, Nag J and Haglund RF. Electron-beam deposition of vanadium dioxide thin films. Applied Physics A: Materials Science & Processing 2013

8. Appavoo K, Brady NF, Seo M, Nag J, Prasankumar RP, Hilton DH and Haglund RF. Ultrafast Metal-Insulator Transition in VO2 Driven by Electron Injection. Postdeadline CLEO:QELS Fundamental Science 2012 

7. Wall S, Wegkamp D, Foglia F, Appavoo K, Nag J, Haglund RF, Stahler J and Wolf M, Ultrafast Changes in Lattice Symmetry Probed by Coherent PhononsNature Commununications 2012 

6. Appavoo K*, Lei DY*, Sonnefraud Y, Wang B, Pantelides ST, Maier SA and Haglund RF. Role of Defects in Phase Transition of VO2 Nanoparticles Probed by Plasmon Resonance Spectroscopy. Nano Lett. 2012

5. Lei DY*, Fernandez-Dominguez AI*, Sonnefraud Y, Appavoo K, Haglund RF, Pendry JB and Maier S. Revealing Plasmonic Gap Modes in Particle-on-Film Systems Using Dark-Field Spectroscopy. ACS Nano 2012 

4. Appavoo K and Haglund RF. Effect of Phase-Transforming Medium on Coherent Electron Dynamics in Gold NanoantennasCLEO:QELS Fundamental Science 2011

3. Appavoo K and Haglund RF. Detecting Nanoscale Size Dependence in VO2 Phase Transition Using a Split-Ring Resonator MetamaterialNano Letters 2011 

2. Lei DY, Appavoo K, Sonnefraud Y, Haglund RF and Maier SA. Single-Particle Plasmon Resonance Spectroscopy of Phase Transition in Vanadium DioxideOptics Letters 2010 

1. Appavoo K, Lei DY, Sonnefraud Y, Ferrara DW, Nag J, Maier SA and Haglund RF. Spectral Modulation of Single Plasmonic NanostructuresSynthesis and Photonics of Nanoscale Materials VII, Proceedings of SPIE 2010