409 citations · 2.6k across the 33 of their papers we have counts for
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Plasmonic Modes in hybrid Josephson Junction Arrays
Alex Kirchner, Simon Feyrer, Vjeko Dimić +9
We present microwave characterization measurements of Josephson junction arrays (JJAs) based on epitaxial Al-InAs quantum well heterostructure. The Josephson inductance of the cons…
Bright excitons with negative-mass electrons
Kai-Qiang Lin, Chin Shen Ong, Sebastian Bange +15
Bound electron-hole excitonic states are generally not expected to form with charges of negative effective mass. We identify such excitons in a single layer of the semiconductor WS…
Exciton diffusion and halo effects in monolayer semiconductors
Marvin Kulig, Jonas Zipfel, Philipp Nagler +6
We directly monitor exciton propagation in freestanding and SiO2-supported WS2 monolayers through spatially- and time-resolved micro-photoluminescence under ambient conditions. We…
Dark states in a carbon nanotube quantum dot
Andrea Donarini, Michael Niklas, Michael Schafberger +3
Illumination of atoms by resonant lasers can pump electrons into a coherent superposition of hyperfine levels which can no longer absorb the light. Such superposition is known as d…
Momentum-space indirect interlayer excitons in transition metal dichalcogenide van der Waals heterostructures
Jens Kunstmann, Fabian Mooshammer, Philipp Nagler +9
Monolayers of transition metal dichalcogenides (TMDCs) feature exceptional optical properties that are dominated by excitons, tightly bound electron-hole pairs. Forming van der Waa…
Quartz tuning-fork based carbon nanotube transfer into quantum device geometries
S. Blien, P. Steger, A. Albang +2
With the objective of integrating single clean, as-grown carbon nanotubes into complex circuits, we have developed a technique to grow nanotubes directly on commercially available…
Giant Zeeman splitting inducing near-unity valley polarization in van der Waals heterostructures
Philipp Nagler, Mariana V. Ballottin, Anatolie A. Mitioglu +8
Monolayers of semiconducting transition metal dichalcogenides exhibit intriguing fundamental physics of strongly coupled spin and valley degrees of freedom for charge carriers. Whi…
Polarized SERS of individual suspended carbon nanotubes by Pt-Re nanoantennas
Christian Bäuml, Tobias Korn, Christoph Lange +3
We present optical nanoantennas designed for applications that require processing temperatures larger than 800°C. The antennas consist of arrays of Re/Pt bilayer strips fabricated…
Interlayer exciton dynamics in a dichalcogenide monolayer heterostructure
Philipp Nagler, Gerd Plechinger, Mariana V. Ballottin +8
In heterostructures consisting of different transition-metal dichalcogenide monolayers, a staggered band alignment can occur, leading to rapid charge separation of optically genera…
Secondary electron interference from trigonal warping in clean carbon nanotubes
A. Dirnaichner, M. del Valle, K. J. G. Götz +5
We investigate Fabry-Perot interference in an ultraclean carbon nanotube resonator. The conductance shows a clear superstructure superimposed onto conventional Fabry-Perot oscillat…
Identification of excitons, trions and biexcitons in single-layer WS2
Gerd Plechinger, Philipp Nagler, Julia Kraus +4
Single-layer WS is a direct-gap semiconductor showing strong excitonic photoluminescence features in the visible spectral range. Here, we present temperature-dependent photolum…
Tailored nano-antennas for directional Raman studies of individual carbon nanotubes
Nicola Paradiso, Fatemeh Yaghobian, Christoph Lange +4
We exploit the near field enhancement of nano-antennas to investigate the Raman spectra of otherwise not optically detectable carbon nanotubes (CNTs). We demonstrate that a top-dow…
Selective control of edge-channel trajectories by scanning gate microscopy
N. Paradiso, S. Heun, S. Roddaro +5
Electronic Mach-Zehnder interferometers in the Quantum Hall (QH) regime are currently discussed for the realization of quantum information schemes. A recently proposed device archi…
Scanning Gate Imaging of quantum point contacts and the origin of the 0.7 Anomaly
Andrea Iagallo, Nicola Paradiso, Stefano Roddaro +6
The origin of the anomalous transport feature appearing at conductance G \approx 0.7 x (2e2/h) in quasi-1D ballistic devices - the so-called 0.7 anomaly - represents a long standin…
Imaging backscattering through impurity-induced antidots in quantum Hall constrictions
Nicola Paradiso, Stefan Heun, Stefano Roddaro +6
We exploit the biased tip of a scanning gate microscope (SGM) to induce a controlled backscattering between counter-propagating edge channels in a wide constriction in the quantum…
Imaging fractional incompressible stripes in integer quantum Hall systems
Nicola Paradiso, Stefan Heun, Stefano Roddaro +5
Transport experiments provide conflicting evidence on the possible existence of fractional order within integer quantum Hall systems. In fact integer edge states sometimes behave a…
Impact of electron heating on the equilibration between quantum Hall edge channels
Nicola Paradiso, Stefan Heun, Stefano Roddaro +3
When two separately contacted quantum Hall (QH) edge channels are brought into interaction, they can equilibrate their imbalance via scattering processes. In the present work we us…
Spatially-resolved analysis of edge-channel equilibration in quantum Hall circuits
Nicola Paradiso, Stefan Heun, Stefano Roddaro +7
We demonstrate an innovative quantum Hall circuit with variable geometry employing the moveable electrostatic potential induced by a biased atomic force microscope tip. We exploit…
Tuning non-linear charge transport between integer and fractional quantum Hall states
Stefano Roddaro, Nicola Paradiso, Vittorio Pellegrini +3
Controllable point junctions between different quantum Hall phases are a necessary building block for the development of mesoscopic circuits based on fractionally-charged quasipart…