Impact of Kinetic Inductance on the Critical-Current Oscillations of Nanobridge SQUIDs

Dausy, Heleen; Nulens, Lukas; Raes, Bart; Bael, M. J. Van; Vondel, J. Van de

doi:10.1103/physrevapplied.16.024013

Cited by 11 publications

(22 citation statements)

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“…This is likely due to the more pronounced bridge asymmetry in the idealized geometry versus the case of the real sample. As the critical phase angle of a bridge is proportional to its length and the inductance to its aspect ratio [13], increasing the width of the nanobridge by ∼ 10% shifts the diamonds to a closer agreement with experimental data. This adjustment is indicated by the blue dashed line in Figure 4b.…”

Section: Validation With Time-dependent Ginzburg-landau Simulationssupporting

confidence: 67%

Metastable states and hidden phase slips in nanobridge SQUIDs

Nulens¹,

Dausy²,

Wyszynski³

et al. 2022

Preprint

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We fabricated an asymmetric nanoscale SQUID consisting of one nanobridge weak link and one Dayem bridge weak link. The current phase relation of these particular weak links is characterized by multivaluedness and linearity. While the latter is responsible for a particular magnetic field dependence of the critical current (so-called vorticity diamonds), the former enables the possibility of different vorticity states (phase winding numbers) existing at one magnetic field value. In experiments the observed critical current value is stochastic in nature, does not necessarily coincide with the current associated with the lowest energy state and critically depends on the measurement conditions. In this work, we unravel the origin of the observed metastability as a result of the phase dynamics happening during the freezing process and while sweeping the current. Moreover, we employ special measurement protocols to prepare the desired vorticity state and identify the (hidden) phase slip dynamics ruling the detected state of these nanodevices. In order to gain insights into the dynamics of the condensate and, more specifically the hidden phase slips, we performed time-dependent Ginzburg-Landau simulations.

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Section: Validation With Time-dependent Ginzburg-landau Simulationssupporting

confidence: 67%

Metastable states and hidden phase slips in nanobridge SQUIDs

Nulens¹,

Dausy²,

Wyszynski³

et al. 2022

Preprint

Self Cite

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“…This effect may be caused by several reasons. First, it may be a simple self-field effect earlier observed in asymmetric SQUIDs 13,[28][29][30][31] and asymmetric wide junctions 32 with high critical current. Second, the rectification may be caused by spin-orbit interaction in BST, which requires the presence of the two field components: parallel (B y ) and perpendicular (B z ) to the BST plane.…”

Section: Resultsmentioning

confidence: 96%

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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“…However, if at least one of the junctions is an elongated constriction, such as a nanobridge or a nanowire, the CΦR of the junction becomes linear [15,16]. As a result, the I c (B) oscillations become linear as well and the four line segments of I c (B), two in the positive and two in the negative current side, define a so-called vorticity diamond [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the superconducting phase across such elongated constrictions can exceed 2π [18]. As such, different solutions exist at one magnetic field value (overlap of the vorticity diamonds), each corresponding with a different winding number, n v , of the superconducting phase across the SQUID.…”

Section: Introductionmentioning

confidence: 99%

“…This fact has been explored in proposed zero-field memory elements [26,29], in which the key ingredient is the creation of an asymmetry in the superconducting properties of the SQUID junctions. For a fully superconducting device, we previously demonstrated that the kinetic induction of the junctions may be tuned via nanofabrication, allowing control over the I c (B) characteristics of the device [18].…”

Section: Introductionmentioning

confidence: 99%

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