Supercurrent Density Distribution in Josephson Junctions

Dynes, R. C.; Fulton, T. A.

doi:10.1103/physrevb.3.3015

Cited by 131 publications

(110 citation statements)

References 16 publications

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“…The applied magnetic field H was in the plane of the junction (x-y plane) and parallel to the vertical edges of the 7 µm x 7 µm junction (although a small misalignment cannot be ruled out). This symmetric behavior is consistent with a uniform insulating tunnel barrier with negligible leakage current and pinholes [39].…”

Section: B Josephson Junction Characterizationsupporting

confidence: 63%

Atomically Thin Al2O3 Films for Tunnel Junctions

Wilt

Gong

et al. 2017

Phys. Rev. Applied

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Metal-Insulator-Metal tunnel junctions (MIMTJ) are common throughout the microelectronics industry. The industry standard AlO x tunnel barrier, formed through oxygen diffusion into an Al wetting layer, is plagued by internal defects and pinholes which prevent the realization of atomically-thin barriers demanded for enhanced quantum coherence. In this work, we employed in situ scanning tunneling spectroscopy along with molecular dynamics simulations to understand and control the growth of atomically thin Al 2 O 3 tunnel barriers using atomic layer deposition (ALD). We found that a carefully tuned initial H 2 O pulse hydroxylated the Al surface and enabled the creation of an atomically-thin Al 2 O 3 tunnel barrier with a high quality M-I interface and a significantly enhanced barrier height compared to thermal AlO x . These properties, corroborated by fabricated Josephson Junctions, show that ALD Al 2 O 3 is a dense, leak-free tunnel barrier with a low defect density which can be a key component for the next-generation of MIMTJs.

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Section: B Josephson Junction Characterizationsupporting

confidence: 63%

Atomically Thin Al2O3 Films for Tunnel Junctions

Wilt

Gong

et al. 2017

Phys. Rev. Applied

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“…To answer this question we have calculated the I c (B) pattern for both (110) (Fig. 10a) and (100) junctions (Fig.10b) according to the formula [24]:…”

Section: Modeling Of Josephson and Quasiparticle Tunnelingmentioning

confidence: 99%

Observation of Andreev bound states inYBa2Cu3O7−x∕Au
Chesca
¹
,
Doenitz
²
,
Dahm
³

et al. 2006
Phys. Rev. B
23
2
17
0
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We report on Josephson and quasiparticle tunneling in YBa 2 Cu 3 O 7-x (YBCO)/Au/Nb ramp junctions of several geometries. Macroscopically, tunneling is studied in the ab-plane of YBCO either in the (100) and (010) direction, or in the (110) direction. These junctions have a stable and macroscopically well defined geometry. This allows systematic investigations of both quasiparticle and Josephson tunneling over a wide range of temperatures and magnetic fields. With Nb superconducting, the proximity gap induced in the Au layer appears in the quasiparticle conductance spectra as well defined coherence peaks and a dip at the center of a broadened zerobias conductance peak (ZBCP). The voltage position of the coherence peaks varies with Au layer thickness. As we increase the temperature or an applied magnetic field both the coherence peaks and the dip get suppressed and the ZBCP fully develops, while states are conserved. With Nb in the normal state the ZBCP is observed up to about 77 K and is almost unaffected by an increasing field up to 7 T. The measurements are consistent with a convolution of density of states with broadened Andreev bound states formed at the YBCO/Au/Nb junction interfaces. Since junctions with different geometries are fabricated on the same substrate under the same conditions one expects to extract reliable tunneling information that is crystallographic direction sensitive. In high contrast to Josephson tunneling, however, the quasiparticle conductance spectra are crystallographic orientation insensitive: independent whether the tunneling occurs in the (100) or (110) directions, a pronounced ZBCP is always observed, consistent with microscopic roughness of the junction interfaces. Qualitatively, all these particularities regarding quasiparticle spectra hold regardless whether the YBCO thin film is twinned or untwinned. This suggests that the formation of Andreev bound states is, to a first approximation, insensitive to twinning.

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“…These traps have an extremely long recombination time [28] Photoresponse of Pb-CdSe-Pb junction as a function of exposure time with 6 300 Á radiation is shown in figure 6 [30]. The same curve plotted for Pb-CdS-Pb with light input of 6 …”

mentioning

confidence: 95%

“…-Since the first experiments reported by Giaever [1] on light sensitive tunnel junctions there has been great interest in the investigation of such structures from both the experimental [2]- [4] and theoretical point of view [2], [5]. The effect of the external magnetic field on the maximum Josephson current has been experimentally investigated for these junctions by Dynes and Fulton [6]. Investigation of structures which employ semiconductor layers as tunneling barriers, independent of photosensitive effects, has been performed by many Authors [6]- [16].…”

mentioning

confidence: 99%

“…The effect of the external magnetic field on the maximum Josephson current has been experimentally investigated for these junctions by Dynes and Fulton [6]. Investigation of structures which employ semiconductor layers as tunneling barriers, independent of photosensitive effects, has been performed by many Authors [6]- [16]. Cardinne et al [17] have considered semiconductor barriers for low capacitance tunnel junctions.…”

mentioning

confidence: 99%

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