Ubiquitous Superconducting Diode Effect in Superconductor Thin Films

Hou, Yasen; Nichele, Fabrizio; Chi, Hang; Lodesani, Alessandro; Wu, Yingying; Ritter, Markus F.; Haxell, Daniel Z.; Davydova, Margarita; Ilić, Stefan; Glezakou-Elbert, Ourania; Varambally, Amith; Bergeret, F. S.; Kamra, Akashdeep; Fu, Liang; Lee, Patrick A.; Moodera, Jagadeesh S.

doi:10.48550/arxiv.2205.09276

Cited by 21 publications

(42 citation statements)

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“…We have verified that these two phenomena cannot explain our observations because both applied and induced fields are very small. Thus, our experiment resembles recent studies of NbSe 2 nanowires 34 and of thin metallic films 35 , where the rectification has been observed in presence of only the B z field component. We attribute the rectification effect in our sample to the finite kinetic inductance of the proximized BST layer under the Nb islands, as will be explained below.…”

Section: Resultssupporting

confidence: 86%

Interference, diffraction, and diode effects in superconducting array based on Bi0.8Sb1.2Te3 topological insulator

Song¹,

Suresh-Babu²,

Yang³

et al. 2022

Preprint

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It is a well known phenomenon in optics that spectroscopic resolution of a diffraction grating is much better compared to an interference device having just two slits, as in the Young's famous doubleslit experiment. On the other hand, it is well known that a classical superconducting quantum interference device (SQUID) is analogous to the optical double-slit experiment. Here we report experiments and present a model describing a superconducting analogue to the diffraction grating, namely an array of superconducting islands positioned on a topological insulator (TI) film Bi 0.8 Sb 1.2 Te 3 . In the limit of extremely weak field, of the order of one vortex per the entire array, such devices exhibit a critical current peak that is much sharper than the analogous peak of an ordinary SQUID. Because of this, such arrays can be used as sensitive absolute magnetic field sensors. An important finding is that, due to the inherent asymmetry of such arrays, the device also acts as a superconducting diode.

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Section: Resultssupporting

confidence: 86%

Interference, diffraction, and diode effects in superconducting array based on Bi0.8Sb1.2Te3 topological insulator

Song¹,

Suresh-Babu²,

Yang³

et al. 2022

Preprint

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show abstract

“…Furthermore, it has been reported that an out-of-plane magnetic field can cause the diode effect due to valley-Zeeman spin-orbit interaction in NbSe 2 14 or the imbalance in valley occupation in the case of twisted tri-layer graphene 19 . A recent experimental report has demonstrated non-reciprocal critical current in superconductor films as well as their hybrid with magnetic insulator employing small to no magnetic fields 23 . Via careful experiments, spin-orbit a) Electronic mail: d.suri@tum.de coupling was ruled out as the origin of the SDE.…”

mentioning

confidence: 99%

Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Suri

Kamra

Meier

et al. 2022

Applied Physics Letters

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Non-reciprocity in the critical current has been observed in a variety of superconducting systems and has been called the superconducting diode effect. The origin underlying the effect depends on the symmetry breaking mechanisms at play. We investigate superconducting micro-bridges of NbN and also NbN/magnetic insulator (MI) hybrids. We observe a large diode efficiency of [Formula: see text]30% when an out-of-plane magnetic field as small as 25 mT is applied. In both NbN and NbN/MI hybrid, we find that the diode effect vanishes when the magnetic field is parallel to the sample plane. Our observations are consistent with the critical current being determined by the vortex surface barrier. Unequal barriers on the two edges of the superconductor strip result in the diode effect. Furthermore, the rectification is observed up to 10 K, which makes the device potential for diode based applications over a larger temperature range than before.

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“…We find that though the charge may be pumped in the adiabatic limit, the diode effect vanishes in the adiabatic limit in both the schemes. The setup in this work that exhibits diode effect is a two terminal setup, in contrast to many four terminal setups [6][7][8]11,15,18 .…”

Section: Discussionmentioning

confidence: 99%

“…In the context of superconductors, the magnitude of critical current through the superconductor being direction dependent marks diode effect. In recent years, the diode effect was observed in superconductors under an applied magnetic field [9][10][11][12][13][14][15][16][17][18] . Time reversal symmetry and inversion symmetry need to be broken to realize the diode effect in superconductors.…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium Josephson diode effect in periodically driven SNS junctions

Soori¹

2022

Preprint

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In typical Josephson junctions, the Josephson current is an odd function of the superconducting phase difference. Recently, diode effect in Josephson junctions is observed in experiments wherein the maximum and the minimum values of the Josephson current do not have the same magnitude. We propose a different setup where Josephson diode effect can be observed wherein normal metal region in superconductor-normal metal-superconductor (SNS) junction is driven. Time reversal symmetry and inversion symmetry need to be broken to observe diode effect in the SNS junction. We calculate long time averaged current for two configurations of SNS junction -one in which inversion symmetry is broken in the undriven part of the Hamiltonian that is not phase biased and the other wherein both the symmetries are broken by the driving potential. In the proposed setup, diode effect vanishes in the adiabatic limit.

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Ubiquitous Superconducting Diode Effect in Superconductor Thin Films

Cited by 21 publications

References 0 publications

Interference, diffraction, and diode effects in superconducting array based on Bi0.8Sb1.2Te3 topological insulator

Interference, diffraction, and diode effects in superconducting array based on Bi0.8Sb1.2Te3 topological insulator

Non-reciprocity of vortex-limited critical current in conventional superconducting micro-bridges

Nonequilibrium Josephson diode effect in periodically driven SNS junctions

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