IISER Pune
INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH (IISER) PUNE
where tomorrow’s science begins today
An Autonomous Institution, Ministry of Human Resource Development, Govt. of India
Links
Seminars and Colloquia

Physics

Supercurrent interference in nanowire-superconductor hybrid systems 
 
Thu, Sep 12, 2019,   04:00 PM at Seminar Hall 31, 2nd Floor, Main Building

Dr. Bhaskaran Muralidharan
IIT Bombay

ABSTRACT: Semiconductor nanowire-superconductor hybrid systems provide a promising platform for hosting unpaired Majorana fermions and thus realizing fault-tolerant topological qubits. In this talk, starting from the basic tenets of quantum transport theory, we demonstrate how to adapt the Non-Equilibrium Green’s Function (NEGF) formalism to model quantum transport in normal (N)-superconductor (S) junctions. We analyze Josephson junctions based on semiconductor nanowires and derive the Andreev bound state spectrum and current-phase relations. Recently, [1], and [2] have reported oscillations in the critical supercurrent with an axial magnetic field. Our simulations indicate that this phenomenon arises from the interference of orbital angular momentum modes [3,4] of the cylindrical nanowire. We also add disorder and study its effect on the critical current oscillations, with an aim to gain a thoroughgoing understanding of the experiments.


[2] Zuo, et. al. Phys. Rev. Lett.119, 187704 (2017
[3] P. Sriram et. al., ArXiv:).
 )

homecolloquia_seminars