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Altermagnetic lifting of Kramers spin degeneracy.
Nature
February 2024
Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic.
Lifted Kramers spin degeneracy (LKSD) has been among the central topics of condensed-matter physics since the dawn of the band theory of solids. It underpins established practical applications as well as current frontier research, ranging from magnetic-memory technology to topological quantum matter. Traditionally, LKSD has been considered to originate from two possible internal symmetry-breaking mechanisms.
View Article and Find Full Text PDFSpin-Triplet Superconductivity from Quantum-Geometry-Induced Ferromagnetic Fluctuation.
Phys Rev Lett
January 2024
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
We show that quantum geometry induces ferromagnetic fluctuation resulting in spin-triplet superconductivity. The criterion for ferromagnetic fluctuation is clarified by analyzing contributions from the effective mass and quantum geometry. When the non-Kramers band degeneracy is present near the Fermi surface, the Fubini-Study quantum metric strongly favors ferromagnetic fluctuation.
View Article and Find Full Text PDFBroken Kramers Degeneracy in Altermagnetic MnTe.
Phys Rev Lett
January 2024
Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Korea.
Altermagnetism is a newly identified fundamental class of magnetism with vanishing net magnetization and time-reversal symmetry broken electronic structure. Probing the unusual electronic structure with nonrelativistic spin splitting would be a direct experimental verification of an altermagnetic phase. By combining high-quality film growth and in situ angle-resolved photoemission spectroscopy, we report the electronic structure of an altermagnetic candidate, α-MnTe.
View Article and Find Full Text PDFCircular current in a one-dimensional open quantum ring in the presence of magnetic field and spin-orbit interaction.
J Phys Condens Matter
December 2023
School of Physical Sciences, Indian Association for the Cultivation of Science, 2A & 2B Raja S. C. Mullick Road, Kolkata 700032, India.
In an open quantum system having a channel in the form of loop geometry, the current inside the channel, namely circular current, and overall junction current, namely transport current, can be different. A quantum ring has doubly degenerate eigen energies due to periodic boundary condition that is broken in an asymmetric ring where the ring is asymmetrically connected to the external electrodes. Kramers' degeneracy and spin degeneracy can be lifted by considering non-zero magnetic field and spin-orbit interaction (SOI), respectively.
View Article and Find Full Text PDFTriggering single-molecule qubit spin dynamics non-Abelian geometric phase effects.
Phys Chem Chem Phys
December 2023
Department of Chemical Sciences, University of Padova, Via Marzolo 1, 35131 Padova, Italy.
We illustrate how macroscopic rotations can be utilised to trigger and control a spin dynamics within the ground doublet of both Kramers and non-Kramers-type molecular nanomagnets the non-Abelian character of the time-evolution operator. For Kramers magnets, we show how this effect can be harnessed to realise single-qubit quantum gates and give the explicit example of a recently reported CoCl(tu) single-molecule magnet (SMM). We demonstrate that gating operations could be performed on this magnet in as fast as 10 ps before the breakdown of adiabaticity, much faster than typical spin-lattice relaxation times.
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