Spin-resolved and charge Josephson diode effects in α−T3 lattice junctions
Zixuan Ding, Donghao Wang, Mengyao Li, Yongchun Tao, Jun Wang
DOI 10.1103/PhysRevB.110.155405 · Physical Review B
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Abstract
The nonreciprocity of critical supercurrents in a Josephson device, termed the Josephson diode effect (JDE), has drawn considerable interest recently. Herein, we present possible spin-resolved and charge JDEs in a Josephson junction based on the α−T3 lattice, due to different spin-resolved Fermi velocities in opposite directions for the distorted flat bands and edge states. Two mechanisms are exhibited, which are characterized by a topological phase with an anisotropic parameter α. One is that the JDE only originates from distorted flat bands, corresponding to the topological phase (0<α<0.5), the other simultaneously from edge states in the topological phase (0.5<α<1). Particularly, the charge JDE only manifests in the context of magnetization and its efficiency can range from −45% to 39%, suggesting a high nonreciprocity. More importantly, both the magnitude and polarity of the charge JDE from edge states and distorted flat bands can be strongly adjusted by the magnetization strength.
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