204 citations · 532 across the 16 of their papers we have counts for
18 papers
Direct Realization of Near-Ideal Carbyne in Ultrathin Boron Nitride Nanotubes
Iryna Ivanenko, Pietro Marabotti, Yifan Zhang +8
Carbyne, the sp-hybridized one-dimensional allotrope of carbon, is predicted to be the stiffest known material, with electronic and optical properties set by a single structural pa…
The Topography Trap: Sifting Interlayer Excitons from Strain-Related Artifacts in Real-World 2D Hetrostructures
Pablo Hernández López, Luka Pirker, Astrid Weston +8
Novel excitonic phenomena emerging in transition metal dichalcogenide (TMDC) heterostructures belong to the most exciting topics in contemporary physics of van der Waals materials.…
Strain engineering of valley-polarized hybrid excitons in a 2D semiconductor
Abhijeet M. Kumar, Douglas J. Bock, Denis Yagodkin +11
Encoding and manipulating digital information in quantum degrees of freedom is one of the major challenges of today's science and technology. The valley indices of excitons in tran…
Universal Vibrational Anharmonicity in Carbyne-like Materials
Johannes M. A. Lechner, Pietro Marabotti, Lei Shi +3
Carbyne, an infinite linear chain of carbon atoms, is the truly one-dimensional allotrope of carbon. While ideal carbyne and its fundamental properties have remained elusive, carby…
Strain fingerprinting of exciton valley character
Abhijeet Kumar, Denis Yagodkin, Roberto Rosati +13
Momentum-indirect excitons composed of electrons and holes in different valleys define optoelectronic properties of many semiconductors, but are challenging to detect due to their…
Surface-Sensitive Raman Scattering by Transferable Nanoporous Plasmonic Membranes
Roman M. Wyss, Günter Kewes, Martin Frimmer +11
Raman spectroscopy is a powerful technique to characterize materials. It probes non-destructively chemical composition, crystallinity, defects, strain and coupling phenomena. Howev…
Strain control of hybridization between dark and localized excitons in a 2D semiconductor
Pablo Hernández López, Sebastian Heeg, Christoph Schattauer +8
Mechanical strain is a powerful tuning knob for excitons, Coulomb-bound electron-hole complexes dominating optical properties of two-dimensional semiconductors. While the strain re…
Freestanding and permeable nanoporous gold membranes for surface-enhanced Raman scattering
Roman M. Wyss, Markus Parzefall, Cynthia M. Gruber +6
Surface-enhanced Raman spectroscopy (SERS) demands reliable, high enhancement substrates in order to be used in different fields of application. Here, we introduce freestanding por…
Raman Sideband Thermometry of Single Carbyne Chains
Cla Duri Tschannen, Martin Frimmer, Georgy Gordeev +6
We demonstrate Raman sideband thermometry of single carbyne chains confined in double-walled carbon nanotubes. Our results show that carbyne's record-high Raman scattering cross se…
Tunable graphene phononic crystal
Jan N. Kirchhof, Kristina Weinel, Sebastian Heeg +4
In the field of phononics, periodic patterning controls vibrations and thereby the flow of heat and sound in matter. Bandgaps arising in such phononic crystals realize low-dissipat…
In situ functionalization of graphene
Kyrylo Greben, Sviatoslav Kovalchuk, Ana M. Valencia +7
While the basal plane of graphene is inert, defects in it are centers of chemical activity. An attractive application of such defects is towards controlled functionalization of gra…
Raman Scattering Cross Section of Confined Carbyne
Cla Duri Tschannen, Georgy Gordeev, Stephanie Reich +5
We experimentally quantify the Raman scattering from individual carbyne chains confined in double-walled carbon nanotubes. We find that the resonant differential Raman cross sectio…
Beam steering with a nonlinear optical phased array antenna
Sebastian Busschaert, Nikolaus Flöry, Sotirios Papadopoulos +3
Transition metal dichalcogenides (TMDCs) exhibit high second harmonic (SH) generation in the visible due to their non-centrosymmetric crystal structure in odd-layered form and dire…
Probing hotspots of plasmon-enhanced Raman scattering by nanomanipulation of carbon nanotubes
Sebastian Heeg, Nick Clark, Aravind Vijayaraghavan
We present a two-step procedure to probe hotspots of plasmon-enhanced Raman scattering with carbon nanotubes. Dielectrophoretic deposition places a small carbon nanotube bundle on…
Minimizing Residues and Strain in 2D Materials Transferred from PDMS
Achint Jain, Palash Bharadwaj, Sebastian Heeg +4
Integrating layered two-dimensional (2D) materials into 3D heterostructures offers opportunities for novel material functionalities and applications in electronics and photonics. I…
Carbon nanotube chirality determines properties of encapsulated linear carbon chain
Sebastian Heeg, Lei Shi, Lisa V. Poulikakos +2
Long linear carbon chains encapsulated inside carbon nanotubes are a very close realization of carbyne, the truly one-dimensional allotrope of carbon. Here we study individual pair…
Evaluating arbitrary strain configurations and doping in graphene with Raman spectroscopy
Niclas S. Mueller, Sebastian Heeg, Miriam Peña Alvarez +13
Raman spectroscopy is a powerful tool for characterizing the local properties of graphene. Here, we introduce a method for evaluating unknown strain configurations and simultaneous…
Quantum Nature of Plasmon-Enhanced Raman Scattering
Patryk Kusch, Sebastian Heeg, Christian Lehmann +6
We report plasmon-enhanced Raman scattering in graphene coupled to a single plasmonic hotspot measured as a function of laser energy. The enhancement profiles of the G peak show st…