Probing the minigap in topological insulator-based Josephson junctions under radio frequency irradiation

doi:10.1088/1674-1056/ab5211

Abstract Recently, a contact-resistance-measurement method was developed to detect the minigap, hence the Andreev bound states (ABSs), in Josephson junctions constructed on the surface of three-dimensional topological insulators (3D TIs). In this work, we further generalize that method to the circumstance with radio frequency (rf) irradiation. We find that with the increase of the rf power, the measured minigap becomes broadened and extends to higher energies in a way similar to the rf power dependence of the outer border of the Shapiro step region. We show that the corresponding data of contact resistance under rf irradiation can be well interpreted by using the resistively shunted Josephson junction (RSJ) model and the Blonder-Tinkham-Klapwijk (BTK) theory. Our findings could be useful when using the contact-resistance-measurement method to study the Majorana-related physics in topological insulator-based Josephson junctions under rf irradiation.

Keywords: topological insulator Josephson junction contact-resistance-measurement method radio frequency irradiation

Received: 11 August 2019
Revised: 30 September 2019
Accepted manuscript online:

PACS:	74.45.+c	(Proximity effects; Andreev reflection; SN and SNS junctions)
	03.65.Vf	(Phases: geometric; dynamic or topological)
	85.25.Cp	(Josephson devices)

Fund: Project supported by the National Basic Research Program of China (Grant Nos. 2016YFA0300601, 2017YFA0304700, and 2015CB921402), the National Natural Science Foundation China (Grant Nos. 11527806, 91221203, 11174357, 91421303, and 11774405), and the Strategic Priority Research Program B of the Chinese Academy of Sciences (Grant Nos. XDB07010100 and XDB28000000), and the Beijing Municipal Science & Technology Commission, China (Grant No. Z191100007219008).

Corresponding Authors: Fanming Qu, Li Lu
E-mail: fanmingqu@iphy.ac.cn;lilu@iphy.ac.cn

Cite this article:

Guang Yang(杨光), Zhaozheng Lyu(吕昭征), Xiang Zhang(张祥), Fanming Qu(屈凡明), Li Lu(吕力) Probing the minigap in topological insulator-based Josephson junctions under radio frequency irradiation 2019 Chin. Phys. B 28 127402

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Probing the minigap in topological insulator-based Josephson junctions under radio frequency irradiation

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