Experimental realization of superconducting quantum interference devices with topological insulator junctions

Authors

M Veldhorst, University of Twente
C G. Molenaar, University of Twente
Xiaolin Wang, University of WollongongFollow
H Hilgenkamp, University of Twente
A Brinkman, University of Twente

RIS ID

52516

Publication Details

Veldhorst, M., Molenaar, C. G., Wang, X. L., Hilgenkamp, H. & Brinkman, A. (2012). Experimental realization of superconducting quantum interference devices with topological insulator junctions. Applied Physics Letters, 100 (7), 072602-1-072602-3.

Abstract

We demonstrate topological insulator (Bi2Te3) dc SQUIDs, based on superconducting Nb leads coupled to nano-fabricated Nb-Bi2Te3-Nb Josephson junctions. The high reproducibility and controllability of the fabrication process allow the creation of dc SQUIDs with parameters that are in agreement with design values. Clear critical current modulation of both the junctions and the SQUID with applied magnetic fields have been observed. We show that the SQUIDs have a periodicity in the voltage-flux characteristic of U0 of relevance to the ongoing pursuit of realizing interferometers for the detection of Majorana fermions in superconductor—topological insulator structures.