A flux tunable superconducting quantum circuit based on Weyl semimetal MoTe2

Kuei-Lin Chiu^1*, D. G. Qian², J. W. Qiu², W. Y. Liu², D. Tan², V. Mosallanejad³, S. Liu², Z. T. Zhang², Y. Zhao², D. P. Yu²

¹Department of Physics, National Sun Yat-Sen University, Kaohsiung City, Taiwan (R.O.C.), Taiwan
²Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen, China
³Key Lab of Quantum Information, University of Science and Technology of China, Hefei, China

* Presenter:Kuei-Lin Chiu, email:eins0728@gmail.com

Weyl semimetals for their exotic topological properties have drawn considerable attention in many research fields. When in combination with s-wave superconductors, the supercurrent can be carried by their topological surface channels, forming junctions mimic the behavior of Majorana bound states. Here, we present a transmon-like superconducting quantum intereference device (SQUID) consists of lateral junctions made of Weyl semimetal Td-MoTe2 and superconducting leads niobium nitride (NbN). The SQUID is coupled to a readout cavity made of molybdenum rhenium (MoRe), whose response at high power reveal the existence of the constituting Josephson junctions (JJs). The loop geometry of the circuit allows the resonant frequency of the readout cavity to be tuned by the magnetic flux. We demonstrate a JJ made of MoTe2 and a flux-tunable transmon-like circuit based on Weyl materials. Our study provides a platform to utilize topological materials in SQUID-based quantum circuits for potential applications in quantum information processing.

Keywords: Weyl semimetals, Superconducting quantum circuits, SQUID