CUED Publications database

Periodic Magnetoconductance oscillation in hybrid Nb-2DEG-Nb ballistic Josephson junctions

Delfanazari, K and Puddy, R and Ma, P and Yi, T and Cao, M and Gul, Y and Farrer, I and Ritchie, D and Joyce, H and Kelly, M and Smith, C (2018) Periodic Magnetoconductance oscillation in hybrid Nb-2DEG-Nb ballistic Josephson junctions. In: American Physical Society March Meeting, 2018-3-5 to 2018-3-9, Los Angeles, California, USA.

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The principle of quantum transport in Nb-In0.75Ga0.25As-Nb Josephson junctions is the phase coherent Andreev reflections at the interfaces of the Nb and 2DEG in In0.75Ga0.25As, where the microscopic phase of the quasiparticles wavefunction in In0.75Ga0.25As and the macroscopic phase of the superconducting order parameter, are combined [1]. The conductance in this system is influenced by several kinds of interference effects. For instance, the conductance oscillates in a step- or sinusoidal- manner when the hybrid junctions are placed in a magnetic field which gives rise to Aharonov-Bohm type effect observation even in such a simply connected system. Here, we report the first experimental observation of periodic conductance oscillation in ballistic Nb-In0.75Ga0.25As 2DEG-Nb junctions in the low magnetic field. We demonstrate that the dI/dV (B) has a maximum close to zero field which drops in a step-like manner when the field is increased. When the field is reversely swept, a hysteresis is observed which is accompanied by oscillation of dI/dV in a sinusoidal manner with a periodicity of ~15 mT at and below T= 320 mK. [1] K. Delfanazari, et al., Adv. Mater. 29, 1701836 (2017).

Item Type: Conference or Workshop Item (UNSPECIFIED)
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 15 Jan 2018 20:22
Last Modified: 18 Aug 2020 12:42