Theoretical Prediction of the Fractional ac Josephson Effect in p- and d-Wave Superconductors
نویسندگان
چکیده
For certain orientations of Josephson junctions between two px-wave or two d-wave superconductors, the subgap Andreev states produce a 4π-periodic relation between the Josephson current I and the phase difference φ: I ∝ sin(φ/2). Consequently, the ac Josephson current has the fractional frequency eV/~, where V is the dc voltage. In the tunneling limit, the Josephson current is proportional to the first power (not square) of the electron tunneling amplitude. Thus, the Josephson current is carried by single electrons, rather than by Cooper pairs.
منابع مشابه
اتصال جوزفسون بین ابررساناهای دمای بالا با ضریب عبور اختیاری
In this paper, a dc Josephson junction between two singlet superconductors (d-wave and s-wave) with arbitrary reflection coefficient has been investigated theoretically. For the case of high Tc superconductors, the c-axes are parallel to an interface with finite transparency and their ab-planes have a mis-orientation. The physics of potential barrier will be demonstrated by a transparency coeff...
متن کاملبررسی تحلیلی چگالی حالتهای موضعی در پیوندگاه جوزفسون بین ابررساناهای دمای بالا (D-I-D)
In this paper, the density of states (DOS) of a planar d-wave Josephson junction is studied analytically. Two high temperature superconductors are separated by an interface with finite transparency coefficient. The c-axes are parallel to the interface and ab-axes have a mis-orientation. The tunneling occurs via the interface because of phase difference between superconducting bulks. The effec...
متن کاملThe time reversal invariant fractional Josephson effect
One of the most basic consequences of topological superconductivity is the fractional Josephson effect, which arises due to the coherent tunneling of single electrons between two superconductors, leading to an ac Josephson effect with half the usual Josephson frequency. In this paper we will review the theoretical and experimental foundations of topological superconductivity and the fractional ...
متن کاملGeneralized dc and ac Josephson effects in antiferromagnets and in antiferromagnetic d-wave superconductors
The Josephson effect is generally described as Cooper-pair tunneling but it can also be understood in a more general context. The dc Josephson effect is the pseudo-Goldstone boson of two coupled systems with a broken continuous Abelian U 1 symmetry. Hence, an analog should exist for systems with broken continuous nonAbelian symmetries. To exhibit the generality of the phenomenon and make predic...
متن کامل8π-periodic dissipationless ac Josephson effect on a quantum spin-Hall edge via a Quantum magnetic impurity
Time-reversal invariance places strong constraints on the properties of the quantum spin Hall edge. One such restriction is the inevitability of dissipation in a Josephson junction between two superconductors formed on such an edge without the presence of interaction. Interactions and spinconservation breaking are key ingredients for the realization of dissipationless ac Josephson effect on suc...
متن کامل