472 citations · 1.3k across the 22 of their papers we have counts for
23 papers
Origin of interlayer exciton-phonon coupling in 2D heterostructures
Muralidhar Nalabothula, Ludger Wirtz, Sven Reichardt
The coupling between excitons and phonons across adjacent layers has been experimentally observed in various heterostructures of layered materials. Yet the precise mechanism underl…
Intervalence Plasmons in Boron-Doped Diamond
Souvik Bhattacharya, Jonathan Boyd, Sven Reichardt +8
Doped semiconductors can exhibit metallic-like properties ranging from superconductivity to tunable localized surface plasmon resonances. Diamond is a wide-bandgap semiconductor th…
Reconfigurable Multifunctional van der Waals Ferroelectric Devices and Logic Circuits
Ankita Ram, Krishna Maity, Cédric Marchand +10
In this work, we demonstrate the suitability of Reconfigurable Ferroelectric Field-Effect- Transistors (Re-FeFET) for designing non-volatile reconfigurable logic-in-memory circuits…
Symmetry-dependent dielectric screening of optical phonons in monolayer graphene
Loïc Moczko, Sven Reichardt, Aditya Singh +13
Quantised lattice vibrations (i.e., phonons) in solids are robust and unambiguous fingerprints of crystal structures and of their symmetry properties. In metals and semimetals, str…
Control of Raman scattering quantum interference pathways in graphene
Xue Chen, Sven Reichardt, Miao-Ling Lin +8
Graphene is an ideal platform to study the coherence of quantum interference pathways by tuning doping or laser excitation energy. The latter produces a Raman excitation profile th…
Engineering tunable strain fields in suspended graphene by microelectromechanical systems
Jens Sonntag, Matthias Goldsche, Tymofiy Khodkov +5
Here, we present a micro-electromechanical system (MEMS) for the investigation of the electromechanical coupling in graphene and potentially related 2D materials. Key innovations o…
Electrical Control over Phonon Polarization in Strained Graphene
Jens Sonntag, Sven Reichardt, Bernd Beschoten +1
We explore the tunability of the phonon polarization in suspended uniaxially strained graphene by magneto-phonon resonances. The uniaxial strain lifts the degeneracy of the LO and…
First-principles calculations of charge carrier mobility and conductivity in bulk semiconductors and two-dimensional materials
Samuel Poncé, Wenbin Li, Sven Reichardt +1
One of the fundamental properties of semiconductors is their ability to support highly tunable electric currents in the presence of electric fields or carrier concentration gradien…
Non-adiabatic exciton-phonon coupling in Raman spectroscopy of layered materials
Sven Reichardt, Ludger Wirtz
We present an ab initio computational approach for the calculation of resonant Raman intensities, including both excitonic and non-adiabatic effects. Our diagrammatic approach, whi…
Theory of resonant Raman scattering: Toward a comprehensive \textit{ab initio} description
Sven Reichardt, Ludger Wirtz
We develop a general, fully quantum mechanical theory of Raman scattering from first principles in terms of many-body correlation functions. In order to arrive at expressions that…
Impact of thermal annealing on graphene devices encapsulated in hexagonal boron nitride
S. Engels, B. Terrés, F. Klein +6
We present a thermal annealing study on single-layer and bilayer (BLG) graphene encapsulated in hexagonal boron nitride. The samples are characterized by electron transport and Ram…
Impact of Many-Body Effects on Landau Levels in Graphene
J. Sonntag, S. Reichardt, L. Wirtz +4
We present magneto-Raman spectroscopy measurements on suspended graphene to investigate the charge carrier density-dependent electron-electron interaction in the presence of Landau…
Tailoring mechanically-tunable strain fields in graphene
M. Goldsche, J. Sonntag, T. Khodkov +7
There are a number of theoretical proposals based on strain engineering of graphene and other two-dimensional materials, however purely mechanical control of strain fields in these…
Raman Spectroscopy of Graphene
Sven Reichardt, Ludger Wirtz
Raman spectroscopy of graphene is reviewed from a theoretical perspective. After an introduction of the building blocks (electronic band structure, phonon dispersion, electron-phon…
Quantum interference effects in resonant Raman spectroscopy of single- and triple-layer MoTe from first principles
Henrique P. C. Miranda, Sven Reichardt, Guillaume Froehlicher +3
We present a combined experimental and theoretical study of resonant Raman spectroscopy in single- and triple-layer MoTe. Raman intensities are computed entirely from first pri…
Ab initio calculation of the peak intensity of graphene: Combined study of the laser and Fermi energy dependence and importance of quantum interference effects
Sven Reichardt, Ludger Wirtz
We present the results of a diagrammatic, fully ab initio calculation of the peak intensity of graphene. The flexibility and generality of our approach enables us to go beyond…
Line Shape of the Raman 2D Peak of Graphene in Van Der Waals Heterostructures
Christoph Neumann, Luca Banszerus, Michael Schmitz +6
The Raman 2D line of graphene is widely used for device characterization and during device fabrication as it contains valuable information on e.g. the direction and magnitude of me…
Modeling charge relaxation in graphene quantum dots induced by electron-phonon interaction
Sven Reichardt, Christoph Stampfer
We study and compare two analytic models of graphene quantum dots for calculating charge relaxation times due to electron-phonon interaction. Recently, charge relaxation processes…
Probing electronic lifetimes and phonon anharmonicities in high-quality chemical vapor deposited graphene by magneto-Raman spectroscopy
Christoph Neumann, Donatus Halpaap, Sven Reichardt +6
We present a magneto-Raman study on high-quality single-layer graphene grown by chemical vapor deposition (CVD) that is fully encapsulated in hexagonal boron nitride by a dry trans…
Spatial control of laser-induced doping profiles in graphene on hexagonal boron nitride
Christoph Neumann, Leo Rizzi, Sven Reichardt +6
We present a method to create and erase spatially resolved doping profiles in graphene-hexagonal boron nitride (hBN) heterostructures. The technique is based on photo-induced dopin…
Low B Field Magneto-Phonon Resonances in Single-Layer and Bilayer Graphene
Christoph Neumann, Sven Reichardt, Marc Drögeler +6
Many-body effects resulting from strong electron-electron and electron-phonon interactions play a significant role in graphene physics. We report on their manifestation in low B fi…
Raman spectroscopy on mechanically exfoliated pristine graphene ribbons
B. Terrés, S. Reichardt, C. Neumann +3
We present Raman spectroscopy measurements of non-etched graphene nanoribbons, with widths ranging from 15 to 160 nm, where the D-line intensity is strongly dependent on the polari…
Raman spectroscopy as probe of nanometer-scale strain variations in graphene
Christoph Neumann, Sven Reichardt, Pedro Venezuela +9
Confocal Raman spectroscopy is a versatile, non-invasive investigation tool and a major workhorse for graphene characterization. Here we show that the experimentally observed Raman…