Dr. Fabio Novelli
Physical Chemistry II and ZEMOS, Ruhr University Bochum, Bochum 44801, Germany
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Academic Career Length
15Years (2012-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications28 July 2013 in Nature Materials
Journal Article
SJS. de Jong
S. de Jong
RKR. Kukreja
R. Kukreja
CTC. Trabant
C. Trabant
NPN. Pontius
N. Pontius
CCChun-Fu Chang
Chun-Fu ChangHDH. A. Dürr
H. A. Dürr
+30
7 October 2014 in Nature Communications
Journal Article
Fabio NovelliGFGiulio De Filippis
Giulio De FilippisVCVittorio Cataudella
Vittorio CataudellaMEMartina Esposito
Martina EspositoIVIgnacio Vergara
Ignacio Vergara
DFDaniele Fausti
Daniele Fausti +14
The non-equilibrium approach to correlated electron systems is often based on the paradigm that different degrees of freedom interact on different timescales. In this context, photo-excitation is treated as an impulsive injection of electronic energy that is transferred to other degrees of freedom only at later times. Here, by studying the ultrafast dynamics of quasi-particles in an archetypal strongly correlated charge-transfer insulator (La2CuO4+δ), we show that the interaction between electrons and bosons manifests itself directly in the photo-excitation processes of a correlated material. With the aid of a general theoretical framework (Hubbard–Holstein Hamiltonian), we reveal that sub-gap excitation pilots the formation of itinerant quasi-particles, which are suddenly dressed by an ultrafast reaction of the bosonic field.
31 October 2012 in Physical Review B
Journal Article
Fabio NovelliDFDaniele Fausti
Daniele FaustiJRJulia Reul
Julia Reul
FCFederico Cilento
Federico CilentoPLPaul H. M. van Loosdrecht
Paul H. M. van LoosdrechtFPFulvio Parmigiani
Fulvio Parmigiani +3
Revealing the nature of charge excitations in strongly correlated electron systems is crucial to understanding their exotic properties. Here we use broadband ultrafast pump-probe spectroscopy in the visible range to study low-energy transitions across the Mott-Hubbard gap in the orbitally ordered insulator YVO3. Separating thermal and nonthermal contributions to the optical transients, we show that the total spectral weight of the two lowest peaks is conserved, demonstrating that both excitations correspond to the same multiplet. The pump-induced transfer of spectral weight between the two peaks reveals that the low-energy one is a Hubbard exciton, i.e., a resonance or a nearly bound state between a doublon and a holon. Finally, we speculate that the pump-driven spin disorder can be used to quantify the kinetic energy gain of the excitons in a ferromagnetic environment.
6 February 2013 in Scientific Reports
Journal Article
Fabio NovelliDFDaniele Fausti
Daniele FaustiFGFrancesca Giusti
Francesca GiustiFPFulvio Parmigiani
Fulvio ParmigianiMHMatthias Hoffmann
Matthias HoffmannSignificant changes of the optical properties of semiconductors can be observed by applying strong electric fields capable to modify the band structure at equilibrium. This is known as the Franz-Keldysh effect (FKE). Here we study the FKE in bulk GaAs by combining single cycle THz pumps and broadband optical probes. The experiments show that the phase content of the selected electromagnetic pulses can be used to measure the timescales characteristic for the different regimes of matter-light interactions. Furthermore, the present phase-resolved measurements allow to identify a novel regime of saturation where memory effects are of relevance.
6 November 2015 in The Journal of Physical Chemistry Letters
Journal Article
Fabio NovelliANAhsan Nazir
Ahsan Nazir
GRGethin H. Richards
Gethin H. Richards
ARAshkan Roozbeh
Ashkan Roozbeh
KWKrystyna E. Wilk
Krystyna E. Wilk
JDJeff Davis
Jeff Davis +1
Journal Article
Water is the most prominent solvent. The unique properties of water are rooted in the dynamical hydrogen-bonded network. While TeraHertz (THz) radiation can probe directly the collective molecular network, several open issues remain about the interpretation of these highly anharmonic, coupled bands. In order to address this problem, we need intense THz radiation able to drive the liquid into the nonlinear response regime. Firstly, in this study, we summarize the available brilliant THz sources and compare their emission properties. Secondly, we characterize the THz emission by Gallium Phosphide (GaP), 2–{3–(4–hydroxystyryl)–5,5–dimethylcyclohex–2–enylidene}malononitrile (OH1), and 4–N,N–dimethylamino–4′–N′–methyl–stilbazolium 2,4,6–trimethylbenzenesulfonate (DSTMS) crystals pumped by an amplified near-infrared (NIR) laser with tunable wavelength. We found that both OH1 as well as DSTMS could convert NIR laser radiation between 1200 and 2500 nm into THz radiation with high efficiency (> 2 × 10−4), resulting in THz peak fields exceeding 0.1 MV/cm for modest pump excitation (~ mJ/cm2). DSTMS emits the broadest spectrum, covering the entire bandwidth of our detector from ca. 0.5 to ~7 THz, also at a laser wavelength of 2100 nm. Future improvements will require handling the photothermal damage of these delicate organic crystals, and increasing the THz frequency.
About Me
During his PhD in Physics, awarded by the University of Trieste in 2013, Fabio Novelli explored the experimental nonlinear optical responses of condensed matter systems characterized by strong electronic correlations, under the guidance of Fulvio Parmigiani and Daniele Fausti. From 2014 to 2016 he worked on multidimensional coherence effects in light-harvesting proteins as a postdoctoral fellow in the group led by Jeffrey A. Davis, at the Centre for Quantum and Optical Science at Swinburne University, Melbourne. From 2017 to 2022 he investigated water with terahertz techniques as a postdoc at the Department of Physical Chemistry of the Ruhr-University Bochum, Germany, with Martina Havenith. From 2023 he is the sole Principal Investigator on an Individual Research Grant (DFG) that aims at exploring the conductivity of gold nanoparticles in water. As of June 2024, he published 27 papers in peer-reviewed journals, including the Proceedings of the National Academy of Sciences of the United States of America, APL Photonics, Science Advances, The Journal of Physical Chemistry Letters, Nature Communications, and Nature Materials. He has given 19 invited talks, including at CLEO US in 2023. His research interests focus on the ultra-fast electronic and vibrational dynamics of complex systems, ranging from strongly correlated solids to hydrogen-bonding liquids and macromolecules in solution.