Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversion

Blonder, G. E.; Tinkham, M.; Klapwijk, T. M.

doi:10.1103/physrevb.25.4515

Cited by 3,534 publications

(3,489 citation statements)

References 13 publications

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“…DC current along the c axis versus voltage (I-V) characteristics (Fig. 2a) reveal excess current below the Bi-2212 T c (~85 K) due to the Andreev reflection at the S-N interfaces 36 , consistent with the model developed for anisotropic superconductors 34 . The observed Andreev reflection indicates that we have achieved a surprisingly low barrier between Bi-2212 and Bi 2 Se 3 .…”

Section: Resultssupporting

confidence: 81%

Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3

et al. 2012

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Interest in the superconducting proximity effect has been reinvigorated recently by novel optoelectronic applications as well as by the possible emergence of the elusive majorana fermion at the interface between topological insulators and superconductors. Here we produce high-temperature superconductivity in Bi 2 se 3 and Bi 2 Te 3 via proximity to Bi 2 sr 2 CaCu 2 o 8 + δ , to access higher temperature and energy scales for this phenomenon. This was achieved by a new mechanical bonding technique that we developed, enabling the fabrication of highquality junctions between materials, unobtainable by conventional approaches. We observe proximity-induced superconductivity in Bi 2 se 3 and Bi 2 Te 3 persisting up to at least 80 K-a temperature an order of magnitude higher than any previous observations. moreover, the induced superconducting gap in our devices reaches values of 10 mV, significantly enhancing the relevant energy scales. our results open new directions for fundamental studies in condensed matter physics and enable a wide range of applications in spintronics and quantum computing.

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Section: Resultssupporting

confidence: 81%

Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3

et al. 2012

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“…Assuming the normal metal to be single band, the previously established quantum waveguide theory (QWT) [5,6] for the wave function matching conditions at the interface is used. While the Blonder Tinkham Klapwijk (BTK) theory [7] predicts a zero energy Andreev bound state (ABS), which is a Majorana fermion (MF) in this case, for each electron pocket, we show that QWT accounts for the correct number of MF's expected from the topological index. The purpose of this work is therefore twofold: (i) as we shall see below, the ABS predicted by QWT correctly reconciles the Andreev problem with the topological index; (ii) we wish to see the interference e ects on the di erential conductance, as the incident electrons go from a single band metal to a multiband superconductor (MBS), as described by QWT theory.…”

Section: Introductionmentioning

confidence: 86%

“…On the contrary, the conductance g s is nite and independent of the disorder parameter Z at the energy value where Eq. (7) is obeyed [5,7,10].…”

Section: The Andreev Problemmentioning

confidence: 99%

Effect of Majorana Fermions on Andreev Spectroscopy of Multiband Topological Superconductors

2015

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We introduce a model for a multiband topological superconductor with two orbitals per lattice site, in two spatial dimensions. Concentrating on the Andreev re ection problem, the appropriate wave function matching conditions for an interface with a normal single-band metal were previously derived in the framework of a quantum waveguide theory. This theory retrieves the correct number of Majorana fermion states as predicted by the topological index. We obtain the di erential conductance as a function of bias voltage, which displays the contribution of the Majorana fermions. Interface disorder is also considered. By varying band structure parameters, topological transitions can be induced, whereby the number of the Majorana modes varies. We calculate the e ect of such transitions on the di erential conductance.

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“…Природа избыточного тока связана с прохождением куперовских пар под щель сверхпровод-ника в результате андреевской конверсии. Ìежду избыточным то-ком и энергетической щелью существует известное соотношение I exc = q∆/eR N (q ≈ 4/3) [32], где R N -сопротивление контакта при температурах выше T c сверхпроводника.…”

Section: экспериментальная методикаunclassified

Response of Critical Temperature of the Superconducting Transition and Energy Gaps of MgB$_2$ to the Hydrostatic Compression

Dyachenko¹,

Tarenkov²,

Кононенко³

2017

Metallofiz. Noveishie Tekhnol.

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*Донецкий физико-технический институт им. А. А. Галкина НАН Украины, просп. Науки, 46, 03028 Киев, Украина Проведено исследование влияния высоких гидростатических давлений (до 15 кбар) на спектр андреевского отражения в контактах MgB 2 /Ag. Пока-зано, что давление приводит к уменьшению сверхпроводящей энергетиче-ской щели для σ-зоны и к существенному росту энергетической щели π-зоны. При этом наблюдается значительное возрастание избыточного тока вольт-амперной характеристики контакта. Возможная причина такой ре-акции спектроскопических характеристик диборида магния на гидроста-тическое сжатие -индуцированное давлением интенсивное рассеяние электронов на подвижных краевых дислокациях в кристаллах MgB 2 .Ключевые слова: диборид магния, энергетические щели в π-и σ-зонах, высокое гидростатическое давление.Проведено дослідження впливу високих гідростатичних тисків (до 15 кбар) на спектр андреєвського відбивання у контактах MgB 2 /Ag. Показа-но, що тиск приводить до зменшення надпровідної енергетичної щілини

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Transition from metallic to tunneling regimes in superconducting microconstrictions: Excess current, charge imbalance, and supercurrent conversion

Cited by 3,534 publications

References 13 publications

Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3

Proximity-induced high-temperature superconductivity in the topological insulators Bi2Se3 and Bi2Te3

Effect of Majorana Fermions on Andreev Spectroscopy of Multiband Topological Superconductors

Response of Critical Temperature of the Superconducting Transition and Energy Gaps of MgB$_2$ to the Hydrostatic Compression

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