Peter Schüffelgen
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View article: Controlling the magnetotransport properties of magnetic topological insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>Cr</mml:mi> <mml:mi>x</mml:mi> </mml:msub> <mml:msub> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>Bi</mml:mi> <mml:mi>y</mml:mi> </mml:msub> <mml:msub> <mml:mi>Sb</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> <mml:mo>−</mml:mo> <mml:mi>y</mml:mi> </mml:mrow> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> <mml:mrow> <mml:mn>2</mml:mn> <mml:mo>−</mml:mo> <mml:mi>x</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mi>Te</mml:mi> <mml:mn>3</mml:mn> </mml:msub> </mml:mrow> </mml:math> thin films via molecular beam epitaxy
Controlling the magnetotransport properties of magnetic topological insulator thin films via molecular beam epitaxy Open
In this work we present a systematic in-depth study of how we can alter the magnetotransport properties of magnetic topological insulator thin films by tuning the parameters of the molecular-beam epitaxy. First, we show how a varying subst…
View article: On-chip stencil lithography for superconducting qubits
On-chip stencil lithography for superconducting qubits Open
Improvements in circuit design and more recently in materials and surface cleaning have contributed to a rapid development of coherent superconducting qubits. However, organic resists commonly used for shadow evaporation of Josephson junct…
View article: Controlling the magneto-transport properties of magnetic topological insulator thin films from Cr$_x$(Bi$_y\,$Sb$_{1-y}$)$_{2-x}$Te$_3$ via molecular beam epitaxy
Controlling the magneto-transport properties of magnetic topological insulator thin films from Cr$_x$(Bi$_y\,$Sb$_{1-y}$)$_{2-x}$Te$_3$ via molecular beam epitaxy Open
In this work we present a systematic in-depth study of how we can alter the magneto-transport properties of magnetic topological insulator thin films by tuning the parameters of the molecular beam epitaxy. First, we show how a varying subs…
View article: Engineering Epitaxial Interfaces for Topological Insulator — Superconductor Hybrid Devices with Al Electrodes
Engineering Epitaxial Interfaces for Topological Insulator — Superconductor Hybrid Devices with Al Electrodes Open
Proximity‐induced superconductivity in hybrid devices of topological insulators and superconductors offers a promising platform for the pursuit of elusive topological superconductivity and its anticipated applications, such as fault‐tolera…
View article: Topological insulator based axial superconducting quantum interferometer structures
Topological insulator based axial superconducting quantum interferometer structures Open
Nanoscale superconducting quantum interference devices are fabricated in-situ from a single Bi 0.26 Sb 1.74 Te 3 nanoribbon that is defined using selective-area growth and contacted with superconducting Nb electrodes via a shadow mask tech…
View article: Topological insulator based axial superconducting quantum interferometer structures
Topological insulator based axial superconducting quantum interferometer structures Open
Nanoscale superconducting quantum interference devices (SQUIDs) are fabricated in-situ from a single Bi$_{0.26}$Sb$_{1.74}$Te$_{3}$ nanoribbon that is defined using selective-area growth and contacted with superconducting Nb electrodes via…
View article: Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels
Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels Open
Magnetic topological insulators in the quantum anomalous Hall regime host ballistic chiral edge channels. When proximitized by an s-wave superconductor, these edge states offer the potential for realizing topological superconductivity and …
View article: Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator
Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator Open
We present a symmetrization routine that optimizes and eases the analysis of imperfect, experimental data featuring the anomalous Hall hysteresis. This technique can be transferred to any hysteresis with (point-)symmetric behavior. The imp…
View article: Single in situ Interface Characterization Composed of Niobium and a Selectively Grown (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ Topological Insulator Nanoribbon
Single in situ Interface Characterization Composed of Niobium and a Selectively Grown (Bi$_{1-x}$Sb$_x$)$_2$Te$_3$ Topological Insulator Nanoribbon Open
With increasing attention in Majorana physics for possible quantum bit applications, a large interest has been developed to understand the properties of the interface between a $s$-type superconductor and a topological insulator. Up to thi…
View article: In-plane magnetic field driven conductance modulations in topological insulator kinks
In-plane magnetic field driven conductance modulations in topological insulator kinks Open
We present low-temperature magnetoconductance measurements on Bi$_{1.5}$Sb$_{0.5}$Te$_{1.8}$Se$_{1.2}$ kinks with ribbon-shaped legs. The conductance displays a clear dependence on the in-plane magnetic field orientation. The conductance m…
View article: Current-induced magnetization switching in a magnetic topological insulator heterostructure
Current-induced magnetization switching in a magnetic topological insulator heterostructure Open
We present the current-induced switching of the internal magnetization direction in a magnetic topological insulator/topological insulator heterostructure in the quantum anomalous Hall regime. The switching process is based on the bias cur…
View article: Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator
Fourier transformation based analysis routine for intermixed longitudinal and transversal hysteretic data for the example of a magnetic topological insulator Open
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 (point-)symmetric behaviour. The implementation of the method i…
View article: Phase-Selective Epitaxy of Trigonal and Orthorhombic Bismuth Thin Films on Si (111)
Phase-Selective Epitaxy of Trigonal and Orthorhombic Bismuth Thin Films on Si (111) Open
Over the past three decades, the growth of Bi thin films has been extensively explored due to their potential applications in various fields such as thermoelectrics, ferroelectrics, and recently for topological and neuromorphic application…
View article: Aharonov-Bohm Interference and Phase-Coherent Surface-State Transport in Topological Insulator Rings
Aharonov-Bohm Interference and Phase-Coherent Surface-State Transport in Topological Insulator Rings Open
We present low-temperature magnetotransport measurements on selectively grown Sb2Te3-based topological insulator ring structures. These devices display clear Aharonov-Bohm oscillations in the conductance originating from phase-coherent tra…
View article: Aharonov-Bohm interference and phase-coherent surface-state transport in topological insulator rings
Aharonov-Bohm interference and phase-coherent surface-state transport in topological insulator rings Open
We present low-temperature magnetotransport measurements on selectively-grown Sb$_2$Te$_3$-based topological insulator ring structures. These topological insulator ring geometries display clear Aharonov-Bohm oscillations in the conductance…
View article: Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels
Robust Majorana bound states in magnetic topological insulator nanoribbons with fragile chiral edge channels Open
Magnetic topological insulators in the quantum anomalous Hall regime host ballistic chiral edge channels. When proximitized by an $s$-wave superconductor, these edge states offer the potential for realizing topological superconductivity an…
View article: Robust and Fragile Majorana Bound States in Proximitized Topological Insulator Nanoribbons
Robust and Fragile Majorana Bound States in Proximitized Topological Insulator Nanoribbons Open
Topological insulator (TI) nanoribbons with proximity-induced superconductivity are a promising platform for Majorana bound states (MBSs). In this work, we consider a detailed modeling approach for a TI nanoribbon in contact with a superco…
View article: Universal conductance fluctuations in a Bi<sub>1.5</sub>Sb<sub>0.5</sub>Te<sub>1.8</sub>Se<sub>1.2</sub> topological insulator nano-scaled Hall bar structure
Universal conductance fluctuations in a Bi<sub>1.5</sub>Sb<sub>0.5</sub>Te<sub>1.8</sub>Se<sub>1.2</sub> topological insulator nano-scaled Hall bar structure Open
We present low-temperature magnetotransport measurements characterizing the promising quaternary Bi 1.5 Sb 0.5 Te 1.8 Se 1.2 topological insulator material. The measurements performed on a nano-Hall bar grown by selective-area molecular be…
View article: Selective Area Epitaxy of Quasi-1-Dimensional Topological Nanostructures and Networks
Selective Area Epitaxy of Quasi-1-Dimensional Topological Nanostructures and Networks Open
Quasi-one-dimensional (1D) topological insulators hold the potential of forming the basis of novel devices in spintronics and quantum computing. While exposure to ambient conditions and conventional fabrication processes are an obstacle to…
View article: Supercurrent in Bi4Te3 Topological Material-Based Three-Terminal Junctions
Supercurrent in Bi4Te3 Topological Material-Based Three-Terminal Junctions Open
In this paper, in an in situ prepared three-terminal Josephson junction based on the topological insulator Bi4Te3 and the superconductor Nb the transport properties are studied. The differential resistance maps as a function of two bias cu…
View article: Ballistic surface channels in fully in situ defined Bi$_4$Te$_3$ Josephson junctions with aluminum contacts
Ballistic surface channels in fully in situ defined Bi$_4$Te$_3$ Josephson junctions with aluminum contacts Open
In this letter we report on the electrical transport properties of Bi$_4$Te$_3$ in a Josephson junction geometry using superconducting Al electrodes with a Ti interdiffusion barrier. Bi$_4$Te$_3$ is proposed to be a dual topological insula…
View article: Supercurrent in Bi$_4$Te$_3$ Topological Material-Based Three-Terminal Junctions
Supercurrent in Bi$_4$Te$_3$ Topological Material-Based Three-Terminal Junctions Open
In an in-situ prepared three-terminal Josephson junction based on the topological insulator Bi$_4$Te$_3$ and the superconductor Nb the transport properties are studied. The differential resistance maps as a function of two bias currents re…
View article: Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons
Robust and fragile Majorana bound states in proximitized topological insulator nanoribbons Open
Topological insulator (TI) nanoribbons with proximity-induced superconductivity are a promising platform for Majorana bound states (MBSs). In this work, we consider a detailed modeling approach for a TI nanoribbon in contact with a superco…
View article: Anomalous temperature dependence of multiple Andreev reflections in a topological insulator Josephson junction
Anomalous temperature dependence of multiple Andreev reflections in a topological insulator Josephson junction Open
As a promising platform for unconventional superconductivity, Josephson junctions (JJs) of tetradymite topological insulators (TIs) and s-wave superconductors have been investigated in recent years. This family of TI materials, however, of…
View article: Probing Edge State Conductance in Ultra‐Thin Topological Insulator Films
Probing Edge State Conductance in Ultra‐Thin Topological Insulator Films Open
Quantum spin Hall (QSH) insulators have unique electronic properties, comprising a band gap in their 2D interior and 1D spin‐polarized edge states in which current flows ballistically. In scanning tunneling microscopy (STM), the edge state…
View article: Probing edge state conductance in ultra-thin topological insulator films
Probing edge state conductance in ultra-thin topological insulator films Open
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 which current flows ballistically. In scanning tunneling micros…
View article: TiN nanobridge Josephson junctions and nanoSQUIDs on SiN-buffered Si
TiN nanobridge Josephson junctions and nanoSQUIDs on SiN-buffered Si Open
We report the fabrication and properties of titanium nitride (TiN) nanobridge Josephson junctions (nJJs) and nanoscale superconducting quantum interference devices (nanoSQUIDs) on SiN-buffered Si substrates. The superior corrosion resistan…
View article: Gate-induced decoupling of surface and bulk state properties in selectively-deposited Bi$_2$Te$_3$ nanoribbons
Gate-induced decoupling of surface and bulk state properties in selectively-deposited Bi$_2$Te$_3$ nanoribbons Open
Three-dimensional topological insulators (TIs) host helical Dirac surface states at the interface with a trivial insulator. In quasi-one-dimensional TI nanoribbon structures the wave function of surface charges extends phase-coherently alo…