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Magnetic phases of XY model with three-spin terms: interplay of topology and entanglement.
J Phys Condens Matter
May 2024
Department of Physics, Jadavpur University, 188 Raja Subodh Chandra Mallik Road, Kolkata 700032, India.
Magnetic and topological properties along with quantum correlations in terms of several entanglement measures have been investigated for an antiferromagnetic (AFM) spin-1/2 XY model in the presence of transverse magnetic field and XZX-YZY type of three-spin interactions. Symmetries of the spin Hamiltonian have been identified. Under the Jordan-Wigner transformation, the spin Hamiltonian converted into spinless superconducting model with nearest neighbor (NN) hopping and Cooper pairing terms in addition to next NN Cooper pairing potential.
View Article and Find Full Text PDFMagnetic exchange interactions at the proximity of a superconductor.
J Phys Condens Matter
April 2024
Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, 52425 Jülich, Germany.
Article Synopsis
- * Magnetic exchange interactions (MEIs) play a critical role in determining the magnetic behavior at these interfaces, affecting transport phenomena and the existence of topological objects.
- * A proposed methodology allows for the extraction of MEI from electronic structure simulations, showing changes in magnetic order and chirality when tuning the superconducting order parameter in a Mn layer on a Nb(110) surface.
Superconductivity in Nb: Impact of Temperature, Dimensionality and Cooper-Pairing.
Nanomaterials (Basel)
January 2024
Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich & JARA, D-52425 Jülich, Germany.
The ability to realistically simulate the electronic structure of superconducting materials is important to understand and predict various properties emerging in both the superconducting topological and spintronics realms. We introduce a tight-binding implementation of the Bogoliubov-de Gennes method, parameterized from density functional theory, which we utilize to explore the bulk and thin films of Nb, known to host a significant superconducting gap. The latter is useful for various applications such as the exploration of trivial and topological in-gap states.
View Article and Find Full Text PDFPhase Asymmetry of Andreev Spectra from Cooper-Pair Momentum.
Phys Rev Lett
November 2023
Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark.
In analogy to conventional semiconductor diodes, the Josephson diode exhibits superconducting properties that are asymmetric in applied bias. The effect has been investigated in a number of systems recently, and requires a combination of broken time-reversal and inversion symmetries. We demonstrate a dual of the usual Josephson diode effect, a nonreciprocal response of Andreev bound states to a superconducting phase difference across the normal region of a superconductor-normal-superconductor Josephson junction, fabricated using an epitaxial InAs/Al heterostructure.
View Article and Find Full Text PDFTunable electron-flexural phonon interaction in graphene heterostructures.
Nature
May 2023
Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX, USA.
Peculiar electron-phonon interaction characteristics underpin the ultrahigh mobility, electron hydrodynamics, superconductivity and superfluidity observed in graphene heterostructures. The Lorenz ratio between the electronic thermal conductivity and the product of the electrical conductivity and temperature provides insight into electron-phonon interactions that is inaccessible to past graphene measurements. Here we show an unusual Lorenz ratio peak in degenerate graphene near 60 kelvin and decreased peak magnitude with increased mobility.
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