1. Point-Contact Tip-Enhanced Raman Spectroscopy: Picoscale Light–Matter Interactions within Plasmonic Cavities
   (Invited Mini-Review)
   T. Kumagai*, K. Miwa, B. Cirera
   Nano Letters ASAP
   DOI: 10.1021/acs.nanolett.5c04045
   
   
   
2. Ultrafast infrared nano-imaging of local electron-hole dynamics in CVD-grown single-walled carbon nanotubes
   J. Nishida*, K. Otsuka, T. Minato, Y. K. Kato, T. Kumagai*
   Science Advances 11, eadv9584 (2025)
   DOI: 10.1126/sciadv.adv958
   
   
   
3. Scattering near-field optical microscopy at 1-nm resolution using ultralow tip oscillation amplitudes
   A. Shiotari*, J. Nishida, A. Hammud, F. Schulz, M. Wolf, T. Kumagai, M. Müller
   Science Advances 11, eadu1415 (2025)
   DOI: 10.1126/sciadv.adu1415
   
   
   
4. Picocavity-Enhanced Raman Spectroscopy of Physisorbed H2 and D2 Molecules
   A. Shiotari*, S. Liu1, G. Trenins, T. Sugimoto, M. Wolf, M. Rossi*, T. Kumagai*
   Physical Review Letters 134, 206901 (2025)
   DOI: 10.1103/PhysRevLett.134.206901
   Press release: Picometric Spectroscopy of Hydrogen Molecules in Atomic-Scale Cavities [Link]
   
   
   
5. Quantitative comparison of local field enhancement from tip-apex and plasmonic nanofocusing excitation via plasmon-assisted field emission resonances
   C. Lin*, J. Li, G. Li, W. Luo, S.Liu, A. Hammud, Y. Xia, A. Pan, M. Wolf, M. Müller, T. Kumagai*
   Nanoscale 17, 7164 (2025)
   DOI: 10.1039/D4NR04262J
   
   
   
6. Plasmonic Light Emission by Inelastic Charge Transport in Ultrathin Zinc Oxide/Metal Heterostructures
   H. Wiedenhaupt, F. Schulz, Luis E. P. López, A. Hammud, Y. Park, A. Shiotari, T. Kumagai, M. Wolf, M. Müller*
   Nano Letters 25, 7, 2870 (2025)
   DOI: 10.1021/acs.nanolett.4c06099
   
   
   
7. Ultrafast Nano-Imaging of Spatially Modulated Many-Body Dynamics in CVD-Grown Monolayer WS₂
   Y. Wang, J. Nishida*, K. Nakamoto, X, Yang, Y. Sakuma, W. Zhang, T. Endo, Y. Miyata, T. Kumagai*
   ACS Photonics 12, 207 (2025)
   DOI: 10.1021/acsphotonics.4c01545
   
   
   
8. Atomic-precision control of plasmon-induced single-molecule switching in a metal–semiconductor nanojunction
   Y. Park*, I. Hamada, A. Hammud, T.Kumagai, M. Wolf, A. Shiotari*
   Nature Communications 15, 6709 (2024)
   DOI: 10.5281/zenodo.10890118
   
   
   
9. Single-molecule tip-enhanced Raman spectroscopy of C60 on the Si(111)-(7 × 7) surface
   B. Cirera*, S. Liu, Y. Park, I. Hamada, M. Wolf, A. Shiotari, T. Kumagai
   Phys. Chem. Chem. Phys. 26, 21325 (2024)
   DOI: 10.1039/D4CP01803F
   
   
   
10. Sub-Tip-Radius Near-Field Interactions in Nano-FTIR Vibrational Spectroscopy on Single Proteins
    J. Nishida*, A. Otomo, T. Koitaya, A. Shiotari, T. Minato, R. Iino, T. Kumagai*
    Nano Lett. 24, 836 (2024)
    DOI: 10.1021/acs.nanolett.3c03479
    Press release: Observing Single Protein with Infrared Nanospectroscopy
    
    
    
11. Continuous-Wave Multiphoton-Induced Electron Transfer in Tunnel Junctions Driven by Intense Plasmonic Fields
    C. Lin*, F. Krecinic, H. Yoshino, A. Hammud, A. Pan, M. Wolf, M. Müller*, T. Kumagai*
    ACS Photonics 10, 3637 (2023)
    DOI: 10.1021/acsphotonics.3c00714
    
    
    
12. Metastability in the Insulator–Metal Transition for Individual Vanadium Dioxide Nanoparticles
    K. Nishikawa, J. Nishida*, M. Yoshimura, K. Nakamoto, T. Kumagai, Y. Watanabe*
    J. Phys. Chem. C 127, 16485 (2023)
    DOI: 10.1021/acs.jpcc.3c02151
    
    
    
13. Inelastic Light Scattering in the Vicinity of a Single-Atom Quantum Point Contact in a Plasmonic Picocavity
    S. Liu, F. P. Bonafe, H. Appel, A. Rubio, M. Wolf, T. Kumagai*
    ACS Nano 17, 10172 (2023)
    DOI: 10.1021/acsnano.3c00261
    
    
    
14. Nanoscale coherent phonon spectroscopy
    S. Liu, A. Hammud, I. Hamada, M. Wolf, M. Müller, T. Kumagai*
    Science Advances 8 (42), eabq5682 (2022)
    DOI: 10.1126/sciadv.abq5682
    
    
    
15. Joule Heating in Single-Molecule Point Contacts Studied by Tip-Enhanced Raman Spectroscopy
    B. Cirera, M. Wolf, T. Kumagai*
    ACS nano 16 (10), 16443-16451 (2022)
    DOI: 10.1021/acsnano.2c05642
    
    
    
16. Femtosecond Thermal and Nonthermal Hot Electron Tunneling Inside a Photoexcited Tunnel Junction
    N. Martín Sabanés, F. Krecinic, T. Kumagai, F. Schulz, M. Wolf, M. Müller*
    ACS nano 16 (9), 14479-14489 (2022)
    DOI: 10.1021/acsnano.2c04846
    
    
    
17. Nanoscale Heating of an Ultrathin Oxide Film Studied by Tip-Enhanced Raman Spectroscopy
    S. Liu, M. Wolf, T. Kumagai*
    Physical Review Letters 128 (20), 206803 (2022)
    DOI: 10.1103/PhysRevLett.128.206803