235 citations · 1.6k across the 48 of their papers we have counts for
52 papers
Frustrated Frustration of Arrays with Four-Terminal Nb-Pt-Nb Josephson Junctions
Justus Teller, Christian Schäfer, Kristof Moors +6
We study the frustration pattern of a square lattice with in-situ fabricated Nb-Pt-Nb four-terminal Josephson junctions. The four-terminal geometry gives rise to a checker board pa…
Fabrication and characterization of InAs nanowire-based quantum dot structures utilizing buried bottom gates
Anton Faustmann, Patrick Liebisch, Benjamin Bennemann +6
Semiconductor nanowires can be utilized to create quantum dot qubits. The formation of quantum dots is typically achieved by means of bottom gates created by a lift-off process. As…
Low-energy modeling of three-dimensional topological insulator nanostructures
Eduárd Zsurka, Cheng Wang, Julian Legendre +6
We develop an accurate nanoelectronic modeling approach for realistic three-dimensional topological insulator nanostructures and investigate their low-energy surface-state spectrum…
Flux-periodic supercurrent oscillations in an Aharonov-Bohm-type nanowire Josephson junction
Patrick Zellekens, Russell S. Deacon, Farah Basaric +10
Phase winding effects in hollow semiconductor nanowires with superconducting shells have been proposed as a route to engineer topological superconducting states. We investigate GaA…
Resonant Raman scattering of surface phonon polaritons mediated by excitons in WSe films
L. Zhou, K. Wirth, M. N. Bui +4
Surface phonon-polaritons propagating along interfaces of polar dielectrics coexist with excitons in many van der Waals heterostructures, so understanding their mutual interactions…
Thermal expansion and temperature dependence of Raman modes in epitaxial layers of Ge and GeSn
Agnieszka Anna Corley-Wiciak, Diana Ryzhak, Marvin Hartwig Zoellner +7
Temperature dependence of vibrational modes in semiconductors depends on lattice thermal expansion and anharmonic phonon-phonon scattering. Evaluating the two contributions from ex…
Induced Superconductivity in Hybrid Au/YBa2Cu3O7-x Electrodes on Vicinal Substrates
Irina I. Gundareva, Jose Martinez-Castro, F. Stefan Tautz +3
Superconducting electrodes are an integral part of hybrid Josephson junctions used in many applications including quantum technologies. We report on the fabrication and characteriz…
Current-induced magnetization switching in a magnetic topological insulator heterostructure
Erik Zimmermann, Justus Teller, Michael Schleenvoigt +5
We present the current-induced switching of the internal magnetization direction in a magnetic topological insulator/topological insulator heterostructure in the quantum anomalous…
Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator
Erik Zimmermann, Michael Schleenvoigt, Alina Rupp +7
We present a symmetrization routine that optimizes and eases the analysis of data featuring the anomalous Hall effect. This technique can be transferred to any hysteresis with (poi…
Optical properties of MoSe monolayer implanted with ultra-low energy Cr ions
Minh N. Bui, Stefan Rost, Manuel Auge +10
The paper explores the optical properties of an exfoliated MoSe monolayer implanted with Cr ions, accelerated to 25 eV. Photoluminescence of the implanted MoSe reveals…
Quantum size effects in ultra-thin YBa2Cu3O7-x films
M. Lyatti, I. Gundareva, T. Röper +4
The d-wave symmetry of the order parameter with zero energy gap in nodal directions stands in the way of using high-temperature superconductors for quantum applications. We investi…
Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels
Declan Burke, Dennis Heffels, Kristof Moors +3
Magnetic topological insulators in the quantum anomalous Hall regime host ballistic chiral edge channels. When proximitized by an -wave superconductor, these edge states offer t…
Observation of Josephson Harmonics in Tunnel Junctions
Dennis Willsch, Dennis Rieger, Patrick Winkel +27
Approaches to developing large-scale superconducting quantum processors must cope with the numerous microscopic degrees of freedom that are ubiquitous in solid-state devices. State…
Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons
Dennis Heffels, Declan Burke, Malcolm R. Connolly +3
Topological insulator (TI) nanoribbons with proximity-induced superconductivity are a promising platform for Majorana bound states (MBSs). In this work, we consider a detailed mode…
In-plane anisotropy of electrical transport in YTbBaCuO films
M. Lyatti, I. Kraiem, T. Röper +4
We fabricate high-quality c-axis oriented epitaxial YBaCuO films with 15% of yttrium atoms replaced by terbium (YTBCO) and study their electrical properties. The Tb…
Probing edge state conductance in ultra-thin topological insulator films
Arthur Leis, Michael Schleenvoigt, Kristof Moors +8
Quantum spin Hall (QSH) insulators have unique electronic properties, comprising a band gap in their two-dimensional interior and one-dimensional spin-polarized edge states in whic…
Microwave spectroscopy of Andreev states in InAs nanowire-based hybrid junctions using a flip-chip layout
Patrick Zellekens, Russell Deacon, Pujitha Perla +4
Josephson junctions based on semiconductor nanowires are potential building blocks for electrically tunable qubit structures, e.g. the gatemon or the Andreev qubit. However, an act…
Te-doped selective-area grown InAs nanowires for superconducting hybrid devices
Pujitha Perla, Anton Faustmann, Sebastian Koelling +11
Semiconductor nanowires have emerged as versatile components in superconducting hybrid devices for Majorana physics and quantum computing. The transport properties of nanowires can…
Lifting the spin-momentum locking in ultra-thin topological insulator films
Arthur Leis, Michael Schleenvoigt, Vasily Cherepanov +6
Three-dimensional (3D) topological insulators (TIs) are known to carry 2D Dirac-like topological surface states in which spin-momentum locking prohibits backscattering. When thinne…
In-plane magnetic field-driven symmetry breaking in topological insulator-based three-terminal junctions
Jonas Kölzer, Kristof Moors, Abur R. Jalil +9
Topological surface states of three-dimensional topological insulator nanoribbons and their distinct magnetoconductance properties are promising for topoelectronic applications and…
Fully in-situ InAs nanowire Josephson junctions by selective-area growth and shadow evaporation
Pujitha Perla, H. Aruni Fonseka, Patrick Zellekens +10
Josephson junctions based on InAs semiconducting nanowires and Nb superconducting electrodes are fabricated in-situ by a special shadow evaporation scheme for the superconductor el…
Flux periodic oscillations and phase-coherent transport in GeTe nanowire-based devices
Jinzhong Zhang, Pok-Lam Tse, Abdur-Rehman Jalil +9
Despite the fact that GeTe is known to be a very interesting material for applications in thermoelectrics and for phase-change memories, the knowledge on its low-temperature transp…
Hard-gap spectroscopy in a self-defined mesoscopic InAs/Al nanowire Josephson junction
Patrick Zellekens, Russell Deacon, Pujitha Perla +10
Superconductor/semiconductor-nanowire hybrid structures can serve as versatile building blocks to realize Majorana circuits or superconducting qubits based on quantized levels such…
Ultra-low threshold cw and pulsed lasing in tensile strained GeSn alloys
A. Elbaz, D. Buca, N. Von den Driesch +15
GeSn alloys are the most promising semiconductors for light emitters entirely based on group IV elements. Alloys containing more than 8 at.% Sn have fundamental direct band-gaps, s…