The dc conductance of normal-superconducting hybrid structures is discussed. It is shown that since the Bogoliubov-DeGennes (BDG) equation does not conserve charge, its application to create a Landauer-type approach for the conductance of the NSN system is problematic. We `mend' this deficiency by calculating the conductance from the Kubo formula for a ring configuration (for this geometry the solutions of the BDG equation conserve charge). We show that the presence of a superconductor segment within an otherwise normal metal may {\em reduce} the overall conductance of the composite structure. This reduction enhances the tendency of the NS composite to become insulating.
In our previous work, high-temperature superconductivity (HTSC) was probed for the first time by using electrical differential conductance Gdiff(V) = dI/dV data as obtained from current-voltage V(I) measurements on a hydrogenated graphitic fiber [1]. While our nonlocal method for finding the superconducting (SC) gap was recently applied to a conventional SC (Pb [2]), the nonlocal Gdiff method was first proposed in [1]. Herein, we are bringing forth an update on the topic.
Conductance spectroscopy of a proximity induced superconducting topological insulator
研究了Au/Bi $_{1.5}$ Sb $_{0.5}$ Te $_{1.7}$ Se $_{1.3}$ /Nb器件中与s波超导电极（STI）直接接触的拓扑绝缘体的全带隙区域与周围拓扑绝缘体薄片（TI）之间的邻近效应。的设备的电导谱示出了一个大的感应间隙中的STI的存在，以及在正常的部分的TI的超导相关的感应上的无功能量的顺序。零能量附近的电导调制的形状在器件之间变化，并且可以通过SNN'（S是超导体，N是超导近似材料，N'是正常金属）器件中的s波诱导的超导性的现有理论来解释。所有的电导谱显示在STI的诱导间隙处的电导下降。
Ni-Ga bilayers are a versatile platform for exploring the competition between strongly antagonistic ferromagnetic and superconducting phases. We characterize the impact of this competition on the transport properties of highly-ballistic Al/Al2O3(/EuS)/Ni-Ga tunnel junctions from both experimental and theoretical points of view. While the conductance spectra of junctions comprising Ni (3 nm)-Ga (60 nm) bilayers can be well understood within the framework of earlier results, which associate the emerging main conductance maxima with the junction films' superconducting gaps, thinner Ni (1.6 nm)-Ga…
Conductance of non-ballistic point contacts in hybrid systems "normal metal/superconductor" Cu/Mo-C and Cu/LaOFFeAs
我们考虑的非弹道点接触NS异质系统的“Andreev”电导曲线的形状取决于在接触的偏置电压。所获得的这些曲线的形状是由来自杂质的相干散射机制的贡献引起的，该相干散射机制使散射截面加倍。广义和微分电导的行为进行了比较弹道和非弹道输运制度。标准被认为是允许一个区分这些制度与相应的传导曲线相似的外观。分析扩展到NS点接触与外来超导体，碳化钼Mo-C和氧铌酸镧La[O $_{1-x}$ F $_{x}$ ]FeAs从一组铁基超导体的非弹道输运的情况。
Quasi-classical theory of tunneling spectroscopy in superconducting topological insulator
本文发展了超导拓扑绝缘体（STI）的隧穿谱理论，即载流子掺杂拓扑绝缘体的超导态。基于准经典近似，我们得到了表面Andreev束缚态（ABS）的能量色散的解析表达式和正常金属/STI结隧穿电导的简洁公式.所得到的隧穿电导的简洁公式使实验数据的分析变得容易。作为我们理论的应用，我们研究了Cu $_x$ Bi $_2$ Se $_3$的隧穿电导。我们揭示了我们的理论再现了Yamakage { \it et al} [Phys. Rev. B 85，180509（R）（2012）]的先前结果。我们进一步研究了在外加磁场中准粒子的能量由于多普勒效应而移动的磁隧道谱。通过旋转基面上的磁场，我们可以在磁隧穿谱中区分两种不同的拓扑超导态，即有和没有点节点。
Experimental evidence of novel phenomena in hydrogenated graphite fibers is found. An indirect excitonic mechanism is likely leading to a SC state below the temperature Tc = 50 K, where the gap is divergent. Analysis of the gap within the framework provided by the Bardeen-Cooper-Schrieffer (BCS) theory of superconductivity shows that this is a multigap system. The energy gap data can be better explained within the framework of topologically protected flat bands applied to systems in which superconductivity occurs on the surface or at the internal interfaces of the samples. The temperature depe…
Observation of Andreev reflection in the c-axis transport of Bi_2Sr_2CaCu_2O_{8+x} single crystals near T_c and search for the preformed-pair state
我们观察到Au $/$ Bi $_2$ Sr $_2$ CaCu $_2$ O $_{8+x}$（Bi 2212）结在超导转变温度$T_c$附近的$c$轴微分电导在零偏压附近的增强。我们将电导增强归因于表面Cu-O双层与相邻的超导内双层之间的Andreev反射。随着温度从下方接近$T_c$，零偏压微分电导从降低到增强的连续演化指向相邻Cu-O双层之间的非超导层的势垒强度的减弱。我们观察到，电导增强持续到几度以上$T_c$在轻微过掺杂的Bi 2212晶体上制备的结。然而，没有观察到电导增强以上$T_c$在欠掺杂晶体，虽然最近提出的理论考虑表明，甚至更宽的温度范围内增强零偏置电导。这似乎为赝能隙态中存在相位不相干的预成对提供了一个消极的观点。
After more than 25 years of research, three even-parity superconducting states -- the $d+id$-wave, $d+ig$-wave, and $s+id$-wave states -- have emerged as leading candidates for the superconducting states of Sr$_2$RuO$_4$. In the present work, we propose a tunneling spectroscopy experiment for distinguishing among these three superconducting states. The key component of our proposal is that we examine the conductance spectra of normal-metal/Sr$_2$RuO$_4$ junctions with various angles between the junction interface and the crystal axis of the Sr$_2$RuO$_4$. The angle dependence of the conductanc…
We study how nonhelical spin textures affect the proximity-induced superconductivity of topological insulator (TI)-superconductor (SC) interface states. In particular we calculate the conductance of lateral heterojunctions which comprise a TI surface that is only partially covered by a superconducting material. Interface potentials at the TI-SC interface may lead to a Fermi velocity and spin texture mismatch between the two regions of the lateral heterojunction. By enforcing the hermiticity of the total Hamiltonian, we derive the boundary conditions and calculate the conductance of the structu…
Recently, Hecker et al. [Phys. Rev. Lett. 79, 1547 (1997)] experimentally studied magnetoconductance fluctuations in a mesoscopic Au wire connected to a superconducting Nb contact. They claimed to have observed an enhancement of the rms magnitude of these conductance fluctuations in the superconducting state (rms(Gns)) relative to that in the normal state (rms(Gn)) by a factor of 2.8. In this comment, we argue that the measured rms(Gns) is NOT significantly enhanced compared to rms(Gn) when we correct for the presence of an incoherent series resistance from the contacts, which is different whe…
We propose a realization of flux qubit based on the hybrid ferromagnetic-superconducting device where the flux bias is induced purely by vector potential of the vanishing magnetic field. We support our conclusions with theoretical analysis and self-consistent three-dimensional simulations for material specific parameters.
