| Autor: |
Chuan-Xin Li, Sa-Ke Wang, Jun Wang |
| Předmět: |
|
| Zdroj: |
Chinese Physics B; Feb2017, Vol. 26 Issue 2, p1-1, 1p |
| Abstrakt: |
We theoretically study the differential conductance of a graphene/graphene superconductor junction, where the valley polarization of Dirac electrons is considered in the nonsuperconducting region. It is shown that the subgap conductance will increase monotonically with the valley-polarization strength when the chemical potential µ is near the Dirac point µ ≤ 3Δ (Δ is the superconducting gap), whereas it will decrease monotonically when µ is far away from the Dirac point, µ ≥ 5Δ. The former case is induced by the specular Andreev reflection while the retro-reflection accounts for the later result. Our findings may shed light on the control of conductance of a graphene superconductor junction by valley polarization. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
