Pure crossed Andreev reflection assisted transverse valley currents in $α-\mathcal{T}_3$ lattices

Abstract

We propose a novel method for the generation of the transverse valley currents, which is based on the pure crossed Andreev reflection (pCAR) in the superconducting hybrid junctions composed of the gapped α − T3 lattices with ferromagnet-induced exchange interaction. The angle-resolved pCAR probability is asymmetric for a given valley, resulting in the transverse valley currents with zero net charge. This pCAR assisted chargevalley conversion is highly efficient with the valley Hall angle reaching an order of unity, suggesting potential applications for valleytronic devices.

Application of WKB Theory to Investigating Electron Tunneling in Kek-Y Graphene

“…Kekulé-patterned graphene is the newest member in the family of Dirac-cone materials, including graphene [11,12], silicene [13][14][15], transition-metal dichalcogenides [16,17], as well as the most unusual group of α-T 3 materials [18][19][20]. The most uncommon feature of α-T 3 model is the presence of a flat band in its energy dispersions giving rise to the most unusual electronic and optical properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. On the other hand, the magnetic properties and magnetic-quantization behavior of α-T 3 materials have also attracted a lot of attention [35][36][37][38][39], including a phase transition from a diamagnetic to a paramagnetic susceptibility by continuously varying the parameter α [40].…”

Application of the WKB Theory to Investigate Electron Tunneling in Kek-Y Graphene

“…Kekulé-patterned graphene is the newest member in the family of Dirac-cone materials, including graphene [11,12], silicene [13][14][15] and transition-metal dichalcogenides [16,17], as well as the most unusual group of α-T 3 materials [18][19][20]. The most uncommon feature of the α-T 3 model is the presence of a flat band in its energy dispersions, giving rise to the most unusual electronic and optical properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. On the other hand, the magnetic properties and magnetic-quantization behavior of α-T 3 materials have also attracted a lot of attention [35][36][37][38][39], including a phase transition from a diamagnetic to a paramagnetic susceptibility by continuously varying the parameter α [40].…”