152 citations · 860 across the 22 of their papers we have counts for
22 papers
Fabrication of high-quality topological insulator nanodevices from bulk-insulating air-sensitive Sb-BiSe
Linh T. Dang, Ayushi Solanki, Yongjian Wang +2
High-quality topological insulator (TI) materials are essential for the realization and detection of Majorana bound states (MBSs) in TI-superconductor hybrid platforms. Widely used…
Topological insulator single-electron transistors for charge sensing applications
Omargeldi Atanov, Junya Feng, Jens Brede +2
We present topological insulator (TI)-based single-electron transistors (SETs) as magnetic-field-compatible charge sensing devices that are easily integrable with TI-superconductor…
Ex Situ Fabrication of Superconducting Nanostructures for Low-Temperature STM
Adrian Greichgauer, Roozbeh Yazdanpanah, Alexey Taskin +3
Nanofabrication of topological insulator (TI) devices is essential for accessing edge and interface states, but conventional lithography and etching compromise the atomically clean…
Experimental observation of repulsively bound magnons
Zhe Wang, Catalin-Mihai Halati, Jean-Sébastien Bernier +9
Stable composite objects, such as hadrons, nuclei, atoms, molecules and superconducting pairs, formed by attractive forces are ubiquitous in nature. By contrast, composite objects…
Selective-Area Epitaxy of Bulk-Insulating (BiSb)Te Films and Nanowires by Molecular Beam Epitaxy
Gertjan Lippertz, Oliver Breunig, Rafael Fister +5
The selective-area epitaxy (SAE) is a useful technique to grow epitaxial films with a desired shape on a pre-patterned substrate. Although SAE of patterned topological-insulator (T…
Topological insulator spin transistor
Linh T. Dang, Oliver Breunig, Zhiwei Wang +2
When a charge current is injected into the surface state of a topological insulator (TI), the resulting shift of the spin-momentum-locked Fermi surface leads to the appearance of a…
Giant magnetochiral anisotropy from quantum confined surface states of topological insulator nanowires
Henry F. Legg, Matthias Rößler, Felix Münning +9
Wireless technology relies on the conversion of alternating electromagnetic fields to direct currents, a process known as rectification. While rectifiers are normally based on semi…
Opportunities in topological insulator devices
Oliver Breunig, Yoichi Ando
Topological insulators (TIs) are expected to be a promising platform for novel quantum phenomena, whose experimental realizations require sophisticated devices. In this Technical R…
Quantum confinement of the Dirac surface states in topological-insulator nanowires
Felix Münning, Oliver Breunig, Henry F. Legg +5
The non-trivial topology of the three-dimensional (3D) topological insulator (TI) dictates the appearance of gapless Dirac surface states. Intriguingly, when a 3D TI is made into a…
Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations
Zhe Wang, M. Schmidt, A. Loidl +11
We report a high-resolution terahertz spectroscopic study of quantum spin dynamics in the antiferromagnetic Heisenberg-Ising spin-chain compound BaCoVO as a function of…
Large positive magneto-conductivity at microwave frequencies in the compensated topological insulator BiSbTeSe2
Mahasweta Bagchi, Lea Pitz-Paal, Christoph P. Grams +6
The bulk electronic properties of compensated topological insulators are strongly affected by the self-organized formation of charge puddles at low temperature, but their response…
Quantum Criticality of an Ising-like Spin-1/2 Antiferromagnetic Chain in Transverse Magnetic Field
Zhe Wang, T. Lorenz, D. I. Gorbunov +11
We report on magnetization, sound velocity, and magnetocaloric-effect measurements of the Ising-like spin-1/2 antiferromagnetic chain system BaCoVO as a function of tem…
Anomalous Fraunhofer patterns in gated Josephson junctions based on the bulk-insulating topological insulator BiSbTeSe2
Subhamoy Ghatak, Oliver Breunig, Fan Yang +3
One-dimensional Majorana modes are predicated to form in Josephson junctions based on three-dimensional topological insulators (TIs). While observations of supercurrents in Josephs…
Quantum criticality in the spin- Heisenberg chain system copper pyrazine dinitrate
Oliver Breunig, Markus Garst, Andreas Klümper +3
The magnetic insulator copper pyrazine dinitrate comprises antiferromagnetic spin-1/2 chains that are well described by the exactly solvable one-dimensional Heisenberg model, provi…
Gigantic negative magnetoresistance in a disordered topological insulator
Oliver Breunig, Zhiwei Wang, A. A. Taskin +3
With the recent discovery of Weyl semimetals, the phenomenon of negative magnetoresistance (MR) is attracting renewed interest. While small negative MR can occur due to the suppres…
Strong magnetoelastic coupling at the transition from harmonic to anharmonic order in NaFe(WO) with 3d configuration
S. Holbein, M. Ackermann, L. Chapon +9
The crystal structure of the double tungstate NaFe(WO) arises from that of the spin-driven multiferroic MnWO by inserting non-magnetic Na layers. NaFe(WO) exhib…
Suppression of Pauling's Residual Entropy in Dilute Spin Ice (DyY)TiO
S. Scharffe, O. Breunig, V. Cho +4
Around 0.5 K, the entropy of the spin-ice DyTiO has a plateau-like feature close to Pauling's residual entropy derived originally for water ice, but an unambiguous quan…
Low-temperature ordered phases of the spin- XXZ chain system CsCoCl
O. Breunig, M. Garst, A. Rosch +6
In this study the magnetic order of the spin-1/2 XXZ chain system CsCoCl in a temperature range from 50 mK to 0.5 K and in applied magnetic fields up to 3.5 T is investigat…
Substitution effects on the temperature vs. magnetic-field phase diagrams of the quasi-1D effective Ising spin-1/2 chain system BaCoVO
S. K. Niesen, O. Breunig, S. Salm +3
BaCoVO is a one-dimensional antiferromagnetic spin-1/2 chain system with pronounced Ising anisotropy of the magnetic exchange. Due to finite interchain interactions lon…
The spin- XXZ chain system CsCoCl in a transverse magnetic field
O. Breunig, M. Garst, E. Sela +5
Comparing high-resolution specific heat and thermal expansion measurements to exact finite-size diagonalization, we demonstrate that CsCoCl for a magnetic field along the c…
Magnetic phase diagrams, domain switching and a quantum phase transition of the quasi-1D Ising-like antiferromagnet BaCo2V2O8
S. K. Niesen, G. Kolland, M. Seher +5
In the effective Ising spin-1/2 antiferromagnetic chain system BaCoVOc$, t…
Thermal Conductivity and Specific Heat of the Spin-Ice Compound DyTiO: Experimental Evidence for Monopole Heat Transport
G. Kolland, O. Breunig, M. Valldor +3
Elementary excitations in the spin-ice compound DyTiO can be described as magnetic monopoles propagating independently within the pyrochlore lattice formed by magnetic…