"Electronic and structural fingerprints of charge density wave excitations in extreme ultraviolet transient absorption spectroscopy" openaccess
T. Heinrich, H.-T. Chang, S. Zayko, K. Rossnagel, M. Sivis, C. Ropers
arXiv:2211.03562 [cond-mat.mtrl-sci] , (2022) [arXiv]
"Coulomb-correlated few-electron states in a transmission electron microscope beam" openaccess
R. Haindl, A. Feist, T. Domröse, M. Möller, S. V. Yalunin, C. Ropers
arXiv:2209.12300 [cond-mat.mes-hall] , (2022) [arXiv]
"Light-induced hexatic state in a layered quantum material" openaccess
T. Domröse, T. Danz, S. F. Schaible, K. Rossnagel, S. V. Yalunin, C. Ropers
arXiv:2207.05571 [cond-mat] , (2022) [arXiv]
"Mode-selective ballistic pathway to a metastable electronic phase" openaccess
H. Böckmann, J. G. Horstmann, A. S. Razzaq, S. Wippermann, C. Ropers
Struct. Dyn. 9, 045102 (2022) [arXiv]

"Coupling ideality of free electrons with photonic integrated waveguides" openaccess
G. Huang, N. J. Engelsen, O. Kfir, C. Ropers, T. J. Kippenberg
arXiv:2206.08098 [quant-ph] , (2022)

"Tailored nanophononic wavefield in a patterned bilayer system probed by ultrafast convergent beam electron diffraction" openaccess
N. Bach, A. Feist, M. Möller, C. Ropers, and S. Schäfer
Structural Dynamics 9, 034301 (2022)

 "Cavity-mediated electron-photon pairs" openaccess
A. Feist, G. Huang, G. Arend, Y. Yang, J.-W. Henke, A. S. Raja, F. J. Kappert, R. N. Wang, H. Lourenço-Martins, Z. Qiu, J. Liu, O. Kfir, T. J. Kippenberg, C. Ropers
Science 377, 777-780 (2022) [arXiv]

"Pinning and gyration dynamics of magnetic vortices revealed by correlative Lorentz and bright-field imaging" openaccess
M. Möller, J. H. Gaida and C. Ropers
Phys. Rev. Research 4, 013027 (2022) [arXiv]


"Probing the Energy Conversion Pathways between Light, Carriers, and Lattice in Real Time with Attosecond Core-Level Spectroscopy" openaccess
T. P. H. Sidiropoulo, N Di Palo, DE Rivas, S Severino, M Reduzzi, B Nandy, B Bauerhenne, S Krylow, T Vasileiadis, T Danz, P Elliott, S Sharma, K Dewhurst, C Ropers, Y Joly, ME Garcia, M Wolf, R Ernstorfer, J Biegert
Phys. Rev. X 11, 4 (2021) [arXiv]

"Ultrafast electron microscopy for probing magnetic dynamics"
T. R. Harvey, N. Rubiano da Silva, J. H. Gaida, M. Möller, A. Feist, S. Schäfer, C. Ropers
MRS Bull. 46, 8 (2021)

"Ultrafast spot-profile LEED of a charge-density wave phase transition"  openaccess
G. Storeck, K. Rossnagel, and C. Ropers
Appl. Phys. Lett. 118(22), 221603 (2021)

"Integrated photonics enables continuous-beam electron phase modulation" openaccess
J.-W. Henke, A. S. Raja, A. Feist, G. Huang, G. Arend, Y. Yang, J. Kappert, R. N. Wang, M. Möller, J. Pan, J. Liu, O. Kfir, C. Ropers and T. J. Kippenberg
Nature 600, 653 (2021) [arXiv]

"Modulation of Cathodoluminescence Emission by Interference with External Light"
V. Di Giulio, O. Kfir, C. Ropers, F.J. García de Abajo
ACS Nano 15(4), 7290-7304 (2021) [arXiv]

"Tailored high-contrast attosecond electron pulses for coherent excitation and scattering"  openaccess
S. V. Yalunin, A. Feist, C. Ropers
Phys. Rev. Research 3, L032036 (2021) [arXiv]

"Optical coherence transfer mediated by free electrons"  openaccess
O. Kfir, V. Di Giulio, F. J. García de Abajo, C. Ropers
Sci. Adv. 7 (18), eabf6380 (2021) [arXiv]

"Ultrafast high-harmonic nanoscopy of magnetization dynamics"  openaccess
S. Zayko, O. Kfir, M. Heigl, M. Lohmann, M. Sivis, M. Albrecht, C. Ropers
Nat. Commun. 12, 6337 (2021) [arXiv]

"Observation of fluctuation-mediated picosecond nucleation of a topological phase"
F. Büttner,, B. Pfau, M. Böttcher, M. Schneider, G. Mercurio, C. M. Günther, P. Hessing, C. Klose, A. Wittmann, K. Gerlinger, L.-M. Kern, C. Strüber, C. von Korff Schmising, J. Fuchs, D. Engel, A. Churikova, S. Hu
Nat. Mater. 20, 30-37 (2021)

"Chiral high-harmonic generation and spectroscopy on solid surfaces using polarization-tailored strong fields"  openaccess
T. Heinrich, M. Taucer, O. Kfir, P. B. Corkum, A. Staudte, C. Ropers and M. Sivis
Nat. Commun. 12, 3723 (2021) [arXiv]

"Spontaneous and Stimulated Electron-Photon Interactions in Nanoscale Plasmonic Near Fields"  openaccess
M. Liebtrau, M. Sivis, A. Feist, H. Lourenço-Martins, N. Pazos-Pérez, R. A. Alvarez-Puebla, F. J. García de Abajo, A. Polman and C. Ropers
Light Sci. Appl. 10(82), (2021) [arXiv]

 "Ultrafast nanoimaging of the order parameter in a structural phase transition"
Th. Danz, T. Domröse, C. Ropers
Science 371, 371-374 (2021) [arXiv]



"Toward Quantum Optics with Free Electrons"
K. Wang, R. Dahan, S. Nehemia, O. Reinhardt, S. Tsesses, I. Kaminer, O. Kfir, H. Lourenço-Martins, A. Feist, C. Ropers, T.J. Kippenberg
Opt Photonics News 31 (12), 35 (2020)

 "Strong-field nano-optics"
P. Dombi, Z. Pápa, J. Vogelsang, S. V. Yalunin, M. Sivis, G. Herink, S. Schäfer, P. Groß, C. Ropers, and C. Lienau
Rev. Mod. Phys. 92, 025003-1 (2020)

"Structure and Nonequilibrium Heat-Transfer of a Physisorbed Molecular Layer on Graphene"  openaccess
B. Wit, O. Bunjes, M. Wenderoth, C. Ropers
Adv. Mater. Interfaces 7, 2000473 (2020)

"A dynamical symmetry triad in high-harmonic generation revealed by attosecond recollision control"  openaccess
S. Zayko, O. Kfir, E. Bordo, A. Fleischer, O. Cohen, C. Ropers
New J. Phys. 22, 053017 (2020)

"Interlocked attosecond pulse trains in slightly bi-elliptical high harmonic generation"  openaccess
E. Bordo, O. Kfir, S. Zayko, O. Neufeld, A. Fleischer, C. Ropers, O. Cohen
J. Phys. Photonics 2, 034005 (2020)

"Nanoscale Nonlinear Spectroscopy with Electron Beams"
A. Konecná, V. Di Giulio, V. Mkhitaryan, C. Ropers, F. J. García de Abajo
ACS Photonics 7, 1290-1296 (2020) [arXiv]

 "Few-nm tracking of current-driven magnetic vortex orbits using ultrafast Lorentz microscopy"  openaccess
M. Möller, J. H. Gaida, S. Schäfer and C. Ropers
Commun. Phys. 3, 36 (2020) [arXiv]

"Density matrix reconstructions in ultrafast transmission electron microscopy: uniqueness, stability, and convergence rates"
C. Shi, C. Ropers, T. Hohage
Inverse Problems 36, 025005 (2020)

"Structural dynamics of incommensurate charge-density waves tracked by ultrafast low-energy electron diffraction"  openaccess
G. Storeck, J. G. Horstmann, T. Diekmann, S. Vogelgesang, G. von Witte, S. Yalunin, K. Rossnagel, C. Ropers
Struct. Dyn. 7, 034304 (2020)

"Controlling Photocurrent Channels in Scanning Tunneling Microscopy"  openaccess
B. Schröder, O. Bunjes, L. Wimmer, K. Kaiser, G. A. Traeger, T. Kotzott, C. Ropers, M. Wenderoth
New J. Phys. 22, 033047 (2020)

 "Controlling free electrons with optical whispering-gallery modes"
O. Kfir, H. Lourenço-Martins, G. Storeck, M. Sivis, T. R. Harvey, T. J. Kippenberg, A. Feist, C. Ropers
Nature 582, 46-49 (2020) [arXiv]

"Probing chirality with inelastic electron-light scattering"
T. R. Harvey, J.-W. Henke, O. Kfir, H. Lourenço-Martins, A. Feist, F. J. García de Abajo, C. Ropers
Nano Lett. 20, 4377-4383 (2020) [arXiv]

"High-purity free-electron momentum states prepared by three-dimensional optical phase modulation"
A. Feist, S. V. Yalunin, S. Schäfer, C. Ropers
Phys. Rev. Research 2, 043227 (2020) [arXiv]

 "Resonant excitation and all-optical switching of femtosecond soliton molecules"
F. Kurtz, C. Ropers and G. Herink
Nat. Photonics 14, 9-13 (2020) [PDF] [arXiv]

 "Coherent control of a surface structural phase transition"
J. G. Horstmann, H. Böckmann, B. Wit, F. Kurtz, G. Storeck and C. Ropers
Nature 583, 232-236 (2020) [arXiv]

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