We study the impact of the nonanalytic reconstruction of vortex cores on static vortex structures in weakly coupled superfluids. We show that, in rotating two-dimensional systems, the Abrikosov vortex lattice is unstable to vortex core deformation: Each zero of the wave function becomes a cut of finite length. The directors characterizing the orientations of the cuts are themselves ordered in superstructures due either to surface effects or to interaction with shear deformations of the lattice (spiral structure). Similar instability may also be observable in clean superconducting films.
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http://dx.doi.org/10.1103/PhysRevLett.118.085303 | DOI Listing |
Angew Chem Int Ed Engl
April 2021
The Earth and Planets Laboratory, Carnegie Institution for Science, Washington, DC, 20015, USA.
The synthesis of polynitrogen compounds is of great importance due to their potential as high-energy-density materials (HEDM), but because of the intrinsic instability of these compounds, their synthesis and stabilization is a fundamental challenge. Polymeric nitrogen units which may be stabilized in compounds with metals at high pressure are now restricted to non-branched chains with an average N-N bond order of 1.25, limiting their HEDM performances.
View Article and Find Full Text PDFNat Commun
December 2019
Wigner Research Centre for Physics, PO Box 49, H-1525, Budapest, Hungary.
Defect-based quantum systems in wide bandgap semiconductors are strong candidates for scalable quantum-information technologies. However, these systems are often complicated by charge-state instabilities and interference by phonons, which can diminish spin-initialization fidelities and limit room-temperature operation. Here, we identify a pathway around these drawbacks by showing that an engineered quantum well can stabilize the charge state of a qubit.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
November 2017
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439.
The motion of Abrikosov vortices in type-II superconductors results in a finite resistance in the presence of an applied electric current. Elimination or reduction of the resistance via immobilization of vortices is the "holy grail" of superconductivity research. Common wisdom dictates that an increase in the magnetic field escalates the loss of energy since the number of vortices increases.
View Article and Find Full Text PDFNat Commun
July 2017
Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
Quantized magnetic vortices driven by electric current determine key electromagnetic properties of superconductors. While the dynamic behavior of slow vortices has been thoroughly investigated, the physics of ultrafast vortices under strong currents remains largely unexplored. Here, we use a nanoscale scanning superconducting quantum interference device to image vortices penetrating into a superconducting Pb film at rates of tens of GHz and moving with velocities of up to tens of km/s, which are not only much larger than the speed of sound but also exceed the pair-breaking speed limit of superconducting condensate.
View Article and Find Full Text PDFPhys Rev Lett
February 2017
Physics Department, Columbia University, New York, New York 10027, USA.
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