Abstract
We theoretically explore possible π-state Josephson junctions made from graphene-like two-dimensional materials (G) with the honeycomb lattice structure. It is shown that the valley polarization in the G sheet could lead to a 0-π state transition of the Josephson junction because of the valley-singlet Cooper pairs acquiring a nonzero momentum. When the valley-mixing scattering exists in the interfaces of the junction due to lattice mismatch, an odd-frequency valley-triplet supercurrent flows in the system even though the G sheet is fully valley polarized, and the supercurrent is characterized by a rapid atomic-scale oscillation with a periodicity of three lattice constants.
| Original language | English |
|---|---|
| Article number | 064501 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 89 |
| Issue number | 6 |
| Online published | 4 Feb 2014 |
| DOIs | |
| Publication status | Published - 2014 |
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: Wang, J., Yang, Y. H., & Chan, K. S. (2014). Josephson π state induced by valley polarization. Physical Review B - Condensed Matter and Materials Physics, 89(6), [064501]. https://doi.org/10.1103/PhysRevB.89.064501. The copyright of this article is owned by American Physical Society.
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