Article
Materials Science, Multidisciplinary
Oleksii Maistrenko, Benedikt Scharf, Dirk Manske, Ewelina M. Hankiewicz
Summary: The study reveals that uniform magnetization in three-dimensional topological insulator Josephson junctions can induce asymmetry in the Andreev spectrum, leading to Majorana modes and the Josephson Hall effect. Magnetic control and gating can enable significant Josephson Hall currents compared to longitudinal currents.
Article
Materials Science, Multidisciplinary
Purna P. Paudel, Trey Cole, Benjamin D. Woods, Tudor D. Stanescu
Summary: Researchers proposed a semiconductor-superconductor hybrid device to achieve topological superconductivity and Majorana zero modes through modulating the junction width. They found that the modulated structure can substantially enhance the topological gap, improve the robustness of the topological superconducting phase, and cover a significant fraction of parameter space with a topological superconducting phase.
Article
Physics, Multidisciplinary
Wei-Xiong Wu, Yang Feng, Yun-He Bai, Yu-Ying Jiang, Zong-Wei Gao, Yuan-Zhao Li, Jian-Li Luan, Heng-An Zhou, Wan-Jun Jiang, Xiao Feng, Jin-Song Zhang, Hao Zhang, Ke He, Xu-Cun Ma, Qi-Kun Xue, Ya-Yu Wang
Summary: We report transport measurements on Josephson junctions consisting of Bi2Te3 topological insulator thin films contacted by superconducting Nb electrodes. The critical supercurrent can be modulated by an electrical gate, indicating different transport properties in p-type and n-type regimes.
CHINESE PHYSICS LETTERS
(2021)
Article
Physics, Applied
Samuel Boutin, Pedro L. S. Lopes, Anqi Mu, Udson C. Mendes, Ion Garate
Summary: Amplifiers based on Josephson junctions offer a fast and noninvasive method for reading superconducting qubits. Researchers predict that the bifurcation dynamics of a topological Josephson junction in the appropriate parameter regime can serve as an additional tool for detecting the emergence of Majorana bound states, as progress continues towards realizing fault-tolerant qubits based on these states.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
D. Razmadze, R. Seoane Souto, L. Galletti, A. Maiani, Y. Liu, P. Krogstrup, C. Schrade, A. Gyenis, C. M. Marcus, S. Vaitiekenas
Summary: We report supercurrent transport measurements in hybrid Josephson junctions consisting of semiconducting InAs nanowires with epitaxial ferromagnetic insulator EuS and superconducting Al coatings. The wires exhibit a hysteretic superconducting window near the coercivity, away from zero external magnetic field. Using a multi-interferometer setup, we measure the current-phase relation of multiple magnetic junctions and observe an abrupt switch between pi and 0 phases within the superconducting window. We attribute the 0-pi transition to the discrete flipping of EuS domains and provide a qualitative theory showing that a sizable exchange field can polarize the junction and lead to the supercurrent reversal. Both 0 and pi phases can be achieved at zero external field by demagnetizing the wire.
Article
Chemistry, Multidisciplinary
Hao-Ke Xu, Mingqiang Gu, Fucong Fei, Yi-Sheng Gu, Dang Liu, Qiao-Yan Yu, Sha-Sha Xue, Xu-Hui Ning, Bo Chen, Hangkai Xie, Zhen Zhu, Dandan Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Qihang Liu, Fengqi Song, Hao Zheng, Jinfeng Jia
Summary: Research has discovered that MnBi4Te7 is a topological insulator with quantum anomalous Hall effect and axion insulator phase. Through scanning tunneling spectroscopy, it has been observed that there is an electronic state at the edge of the magnetic MnBi2Te4 layer at 4.5 K, but not in the nonmagnetic Bi2Te3 layer. As the temperature increases, the edge state disappears, while the state induced by point defects persists.
Article
Chemistry, Multidisciplinary
Francesca Telesio, Matteo Carrega, Giulio Cappelli, Andrea Iorio, Alessandro Crippa, Elia Strambini, Francesco Giazotto, Manuel Serrano-Ruiz, Maurizio Peruzzini, Stefan Heun
Summary: We demonstrate evidence of Josephson coupling in a planar few-layer black phosphorus junction, confirming its existence and characteristics. These findings will accelerate further research on the unique properties of exfoliated black phosphorus thin flakes.
Article
Chemistry, Multidisciplinary
Wenbo Wang, Yi-Fan Zhao, Fei Wang, Matthew W. Daniels, Cui-Zu Chang, Jiadong Zang, Di Xiao, Weida Wu
Summary: In this study, evidence of an emergent topological Hall effect from chiral bubbles in a two-dimensional ferromagnet was reported. The sign of the THE signal is determined by the net curvature of domain walls in different configurations, and the strength of the signal is correlated with the density of nucleation or pinned bubble domains. The findings not only reveal a general mechanism of THE in two-dimensional ferromagnets but also open up possibilities for the manipulation of topological spin textures for spintronic applications.
Article
Chemistry, Multidisciplinary
Antonio Vettoliere, Roberta Satariano, Raffaella Ferraiuolo, Luigi Di Palma, Halima Giovanna Ahmad, Giovanni Ausanio, Giovanni Piero Pepe, Francesco Tafuri, Davide Massarotti, Domenico Montemurro, Carmine Granata, Loredana Parlato
Summary: This paper reports the fabrication and characterization of high-quality ferromagnetic Josephson junctions based on aluminum technology. The innovative fabrication process allows the obtained hybrid aluminum Josephson junctions to have very high quality, supporting the application of ferromagnetic Josephson junctions in advanced quantum circuits.
Article
Materials Science, Multidisciplinary
Tom Dvir, Ayelet Zalic, Eirik Holm Fyhn, Morten Amundsen, Takashi Taniguchi, Kenji Watanabe, Jacob Linder, Hadar Steinberg
Summary: Researchers utilized thin NbSe2 as superconducting electrodes laterally coupled to graphene to form a planar van der Waals two-dimensional Josephson junction. By studying the behavior of these novel devices with respect to temperature, gate voltage, and magnetic fields, they found that the junctions could sustain supercurrent up to high parallel magnetic fields of 8.5 T.
Article
Chemistry, Multidisciplinary
Tobias W. Schmitt, Malcolm R. Connolly, Michael Schleenvoigt, Chenlu Liu, Oscar Kennedy, Jose M. Chavez-Garcia, Abdur R. Jalil, Benjamin Bennemann, Stefan Trellenkamp, Florian Lentz, Elmar Neumann, Tobias Lindstroem, Sebastian E. de Graaf, Erwin Berenschot, Niels Tas, Gregor Mussler, Karl D. Petersson, Detlev Gruetzmacher, Peter Schueffelgen
Summary: This study demonstrates the implementation of superconducting transmon qubits using topological insulator Josephson junctions. The results show the compatibility of these qubits with strong-coupling circuit quantum electrodynamics and their ability for qubit control and temporal quantum coherence.
Article
Multidisciplinary Sciences
Daniel Rosenbach, Tobias W. Schmitt, Peter Schueffelgen, Martin P. Stehno, Chuan Li, Michael Schleenvoigt, Abdur R. Jalil, Gregor Mussler, Elmar Neumann, Stefan Trellenkamp, Alexander A. Golubov, Alexander Brinkman, Detlev Gruetzmacher, Thomas Schaepers
Summary: The article discusses the discovery of a 4 pi periodic current phase relation in Josephson junctions with topological weak links and the attenuation and quantization phenomena observed in certain structures.
Article
Mathematics, Interdisciplinary Applications
Boquan Ren, Yaroslav Kartashov, Hongguang Wang, Yongdong Li, Yiqi Zhang
Summary: Topological edge states can form in periodic materials with specific degeneracies in their modal spectra under the breaking of certain symmetries. Unconventional topological edge states can exist in Floquet insulators based on arrays of helical waveguides with hybrid edges, even if the hybrid edges are long. These edge states are topologically protected and persist in the presence of focusing nonlinearity of the material, expanding the variety of geometrical shapes in which topological insulators can be constructed.
CHAOS SOLITONS & FRACTALS
(2023)
Article
Optics
Zhong Hu, Meibao Qin, He Lingjuan, Wenxing Liu, Tianbao Yu, Shuyuan Xiao, Qinghua Liao
Summary: Researchers propose a width-tunable topological pseudospindependent waveguide using a heterostructure of all-dielectric photonic crystals, which allows for manipulation of the optical beam width. The waveguide exhibits unidirectional transport and immunity against defects, making it suitable for applications such as beam expanders in photonic integrated devices for stable and efficient light transmission.
Article
Physics, Multidisciplinary
Mengyao Li, Yang Yang, Tingmin Liu, Y. C. Tao
Summary: This theoretical study investigates the magnetoanisotropic thermal transport in a TI-based Josephson hybrid structure, revealing the sensitivity of thermal conductance and current to the orientation and magnitude of the exchange field. It demonstrates the existence of negative differential thermal conductance and zero-energy Andreev bound states, which could have potential applications for energy control in various hybridized mesoscopic systems.
Article
Physics, Multidisciplinary
Alireza Habibi, Ahmad Z. Musthofa, Elaheh Adibi, Johan Ekstrom, Thomas L. Schmidt, Eddwi H. Hasdeo
Summary: Integer quantum Hall (IQH) states and quantum anomalous Hall (QAH) states exhibit similar static dc response but different dynamical ac response. We found that the ac anomalous Hall conductivity profile sigma ( yx )(omega) of QAH states is sensitive to the band shape, and flattening the dispersive QAH bands can recover the sigma ( yx )(omega) of flat Landau bands in IQH. The sign change in the resonance profile is not caused by the band gap, but by the van Hove singularity energy of the QAH bands. These topological bands exhibit giant polarization rotation and ellipticity in reflected waves (Kerr effect) and rotation in transmitted waves (Faraday effect) with profiles resembling sigma ( yx )(omega).
NEW JOURNAL OF PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
M. F. Ritter, N. Crescini, D. Z. Haxell, M. Hinderling, H. Riel, C. Bruder, A. Fuhrer, F. Nichele
Summary: Recent experiments have shown that superconductivity in metallic nanowires can be suppressed by applying a moderate gate voltage. This suppression is not due to the presence of electric fields at the nanowire surface, but rather requires the flow of high-energy electrons. The decay of these electrons into phonons, which propagate through the substrate and affect superconductivity, is the key factor in the suppression of superconductivity in nanowires.
NATURE ELECTRONICS
(2022)
Article
Quantum Science & Technology
Ryan Tan, Christoph Bruder, Martin Koppenhofer
Summary: This study focuses on the quantum synchronization of a single spin system driven by an external semi-classical signal, with spin numbers larger than S = 1. The interference-based quantum synchronization blockade is found to be qualitatively different for integer and half-integer spin numbers. The explanation lies in the interplay between the external signal and the limit cycle structure in generating coherence. Furthermore, the dissipative limit-cycle stabilization mechanism leads to different levels of quantum synchronization for integer and half-integer spins, but comparable levels can be achieved by choosing appropriate limit cycles.
Article
Materials Science, Multidisciplinary
Eddwi H. Hasdeo, Edvin G. Idrisov, Thomas L. Schmidt
Summary: In this paper, we investigate Coulomb drag in bilayer systems and find that, in addition to the well-known kinematic and Hall viscosities, there are two new viscosity terms: the drag viscosity and the drag-Hall viscosity. These additional terms arise from changes in the stress tensor due to interlayer Coulomb interactions. By varying the applied magnetic field and electron densities in the two layers, all four viscosity terms can be tuned. At specific ratios of electron densities, the drag viscosity leads to a significant change in longitudinal transport, resulting in negative drag conductivity.
Article
Physics, Multidisciplinary
Andreas Bock Michelsen, Patrik Recher, Bernd Braunecker, Thomas L. Schmidt
Summary: Recent experiments have observed the effect of proximity coupling in a chiral quantum Hall (QH) edge state and an s-wave superconductor through Andreev reflection as a mediating process. We present a microscopic theory by modeling the system with a many-body Hamiltonian, incorporating an s-wave superconductor, spin-orbit coupling, and a magnetic field, coupled by electron tunneling to an integer QH edge state. We obtain an effective pairing Hamiltonian in the QH edge state by integrating out the superconductor. Our work clarifies the appearance of nonlocal superconducting correlations and predicts experimental signatures of Andreev reflection, such as electron-hole conversion suppression and negative resistance.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Andreas Haller, Solofo Groenendijk, Alireza Habibi, Andreas Michels, Thomas L. Schmidt
Summary: This study simulates the ground states of spin-1/2 Heisenberg lattices and discovers the presence of a quantum skyrmion lattice phase. Experimental detection methods are proposed, and the nonclassical nature of this phase is analyzed.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Raphael L. R. C. Teixeira, Andreas Haller, Roshni Singh, Amal Mathew, Edvin G. Idrisov, Luis G. G. V. Dias da Silva, Thomas L. Schmidt
Summary: Parafermion bound states are generalizations of Majorana bound states with richer exchange statistics. The effective coupling Hamiltonian governing these states is determined by multiple interaction terms and finite-size effects can give rise to higher-order parafermion interactions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Edvin G. Idrisov, Ivan P. Levkivskyi, Eugene Sukhorukov, Thomas L. Schmidt
Summary: The effects of Coulomb interactions in mesoscopic electron colliders based on quantum Hall edge states at filling factor ?? = 2 are studied using the nonequilibrium bosonization technique. The current cross correlations and Fano factor, which convey information about the exclusion statistics, are calculated. It is found that both quantities show a nonanalytical dependence on the source transparency, scaling as log(1/Ts) for small Ts << 1. This is attributed to electron-electron interactions in the outgoing nonequilibrium states of the collider.
Article
Optics
Kunmin Wu, Thomas L. Schmidt, M. Belen Farias
Summary: This study investigated the phenomenon of quantum friction when an atom moves parallel to a metallic plate, revealing that even without internal dissipation in the metal, quantum frictional force exists with a threshold relative velocity. The atom must move at a speed higher than the effective speed of sound in the material for friction to occur, a condition prominent near empty or filled bands where the Fermi velocity is low, as supported by analytical arguments at all orders in perturbation theory.
