S. Wu, K. V. Samokhin
Tunneling conductance of a clean normal metal/d-wave superconductor junction is studied by using the extended Blonder-Tinkham-Klapwijk formalism. We show that the conductance is significantly affected by the interface spin-orbit coupling of the Rashba type, which is inevitably present due to the asymmetry of the junction.
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Parity-sensitive measurements based on ferromagnet/superconductor tunneling junctions
提出了一种基于隧道谱的非常规超导体宇称鉴别方法。对于计算模型，我们采用了铁磁/超导（F/S）结的隧道电流是自旋极化。只有当超导体具有奇宇称时，隧穿电导谱才对铁磁体的磁化轴方向十分敏感。因此，有可能通过测量F/S结中的隧穿谱来区分超导体的宇称。
The tunneling conductance between a metal and a multiband s-wave superconductor with a thin layer of single-band s-wave superconductor sandwiched in between is examined in this paper. We show that an in-gap peak in conductance curve is found as a result of the formation of in-gap bound state between the single-band and multiband superconductor junctions if the phases of the superconducting order parameters of the multiband superconductor are frustrated. The implication of this result in determining the gap symmetry of the iron-based superconductors is discussed.
Normal metal to ferromagnetic superconductor tunneling
研究了铁磁超导体与正常金属之间的点接触隧穿。在磁振子诱导对的情况下，隧穿电导是外加电压的连续光滑函数。对于较小的施加电压值，欧姆定律成立。我们证明了可以从隧道磁阻得到磁化强度和超导序参量。在顺磁感应超导的情况下，隧穿不依赖于磁化强度。我们认为，隧道实验可以明确地确定铁磁超导体中正确的配对机制。
Fine structures in the tunneling spectra of superconductors have been widely used to identify fingerprints of the interaction responsible for Cooper pairing. Here we show that for scanning tunneling microscopy (STM) of Pb, the inclusion of inelastic tunneling processes is crucial for the proper interpretation of these fine structures. For STM the usual McMillan inversion algorithm of tunneling spectra must therefore be modified to include inelastic tunneling events, an insight that is crucial for the identification of the pairing glue in conventional and unconventional superconductors alike.
Tunneling spectra for ($d_{x^2-y^2}+is$)-wave superconductors versus tunneling spectra for ($d_{x^2-y^2}+id_{xy}$)-wave superconductors
利用Blonder-Tinkham-Klapwijk（BTK）公式计算了正常金属/绝缘体/单重态超导体的隧穿电导谱。超导体的配对对称性被假定为$d_{x^2-y^2}+is$或$d_{x^2-y^2}+id_{xy}$。结果发现，在（$d_{x^2-y^2}+is$）波的情况下，有一个定义良好的电导峰的电导谱中，在二次s波分量的振幅。在（$d_{x^2-y^2}+id_{xy}$）波的情况下，由于束缚态的形成，隧穿电导在带隙内具有残余值。束缚态能量依赖于入射准粒子的角度，也依赖于边界取向。在此基础上，提出了一个电子聚焦实验来探测（$d_{x^2-y^2}+id_{xy}$）波态。
We investigate numerically the signatures of collective modes in the tunneling spectra of superconductors. The larger strength of the signatures observed in the high-Tc superconductors, as compared to classical low-Tc materials, is explained by the low dimensionality of these layered compounds. We also show that the strong-coupling structures are dips (zeros in the d2I/dV2 spectrum) in d-wave superconductors, rather than the steps (peaks in d2I/dV2) observed in classical s-wave superconductors. Finally we question the usefulness of effective density of states models for the analysis of tunneli…
Theory of the tunneling spectroscopy of ferromagnetic superconductors
研究了正常金属/绝缘体/铁磁超导结中的隧穿电导。隧穿谱显示自旋-单重态s波配对、自旋-三重态相反自旋配对和自旋-三重态等自旋配对有明显的区别：它们在谱中分别呈现能隙结构、双峰结构和零偏置峰。所得结果可作为确定铁磁超导体配对对称性的工具。
Modeling of Tunneling Spectroscopy in High-Tc Superconductors
采用紧束缚能带结构，d-波隙对称性，群速度和隧穿方向性的隧道光谱的理论模型可以表现出广泛的特性类似于在高Tc超导体的隧道实验中发现的。通过对最佳掺杂的Bi_2Sr_2CaCu_2O_8的能带结构的计算，得到了与点接触隧穿电导相一致的隧穿态密度，特别是在带隙区，表现出相同的子带隙形状和电导峰的不对称性。
Hall tunneling of vortices in superclean superconductors
本文讨论了超洁净高$T_{c}$超导体中饼状涡旋霍尔隧穿的主要特征。本文描述了计算钉扎在亚稳位形中的涡旋的寿命的一般形式。将所得结果应用于小驱动电流下柱状缺陷中饼状涡旋的量子隧穿问题。
Tunneling current in triplet f-wave superconductors with horizontal lines of nodes
本文用Blonder-Tinkham-Klapwijk（BTK）公式计算了正常金属/绝缘体/三重态超导体的隧穿电导谱。超导体的可能状态被认为是水平线的节点，打破时间反演对称性。这些结果将有助于区分超导体Sr $_2$ RuO $_4$和UPt $_3$中的配对态。
Tunneling spectroscopy in the magnetic superconductor TmNi2B2C
本文报道了硼碳化物超导体TmNi $_2$ B $_2$ C隧穿电导的新测量结果。结果表明，在没有任何寿命展宽参数的情况下，在整个样品表面上都与弱耦合BCS理论非常一致。当反铁磁相和超导序共存时，在1.5K以下，我们没有发现隧道谱的特别变化。
Tunneling conductance in normal metal - triplet superconductor junction
我们利用Blonder-Tinkham-Klapwijk（BTK）公式计算了正常金属/绝缘体/三重态超导体的隧穿电导谱。对于三重态超导体，我们假设一个特殊的p波序参量具有线节点，两个二维$f$波序参量具有线节点，破坏了时间反演对称性。我们还研究了无节点的配对潜力。隧穿峰是由于在离散的准粒子轨道角的每个表面取向的束缚态的形成。隧道谱可用于区分超导体Sr $_2$ RuO $_4$的可能的候选配对态。
The asymmetric tunneling in cuprate superconductors is studied based on the kinetic energy driven superconducting mechanism. By taking into account the interplay between the superconducting gap and normal-state pseudogap, the essential feature of the evolution of the asymmetric tunneling with doping and temperature is qualitatively reproduced. In particular, the asymmetry of the tunneling spectrum in the underdoped regime weakens with increasing doping, and then the symmetric tunneling spectrum recovers in the heavily overdoped regime. The theory also shows that the asymmetric tunneling is a n…
Spin polarized tunneling in ferromagnet/unconventional superconductor junctions
研究了铁磁/非常规超导（F/S）结中的隧穿效应。我们包括自旋极化，界面电阻，和费米波矢失配（FWM）之间的F和S区域的影响。Andreev反射（AR）在F/S界面，在低偏置电压下的隧道，强烈修改这些参数。电导作为施加电压的函数表现出非常广泛的特征。
Search for the πResonance in Two Particle Tunneling Experiments of YBCO Superconductors
最近的YBCO超导体中子共振散射峰理论预言了正常态下存在尖锐的自旋三重态两粒子集体模（π共振）。在本文中，我们提出了一个实验，其中的π共振可以直接探测在两个粒子的隧道测量。
Tunneling spectroscopy measurement of the superconductor gap parameter of MgB_2
利用低温扫描隧道显微镜和磁化强度测量研究了MgB_2的超导性质。磁化强度测量表明，超导转变起始点在T_c = 38.5K，与前人工作一致。隧穿谱呈现BCS能隙结构，能隙参数在5 ~ 7 meV范围内，能隙比为2delat/KTc ~ 3-4。这表明MgB_2是一种常规的BCS（s波）超导体，无论是在弱耦合还是在“中等耦合”区域
Within the tunneling Hamiltonian formulation for the eight-component spinors,the Josephson critical super-current has been calculated in a planar superconductor-normal graphene-superconductor junction. Coupling between superconductor regions and graphene is taken into account by a tunneling Hamiltonian which contains two types of tunneling, intra-valley and inter-valley tunneling. Within the present tunneling approach, we find that the contributions of two kinds of tunneling to the critical super-current, are completely separable. Therefore, it is possible to consider the effect of the inter-v…
Tunneling spectra for quasi-one-dimensional organic superconductors
利用Blonder-Tinkham-Klapwijk公式计算了正常金属/绝缘体/准一维超导体的隧穿电导谱。超导体的配对对称性被假定为$p$、$d$和$f$波。发现当透射准粒子感受到的对势符号不同时，沿平行于链或垂直于链的方向，电子隧穿存在一个明确的零能峰。谱线的实际形状对费米面上的对势节点很敏感。
We propose a model of quasiparticle tunneling across the high-$T_c$ superconductor-insulator-normal metal junction based on the different mechanisms for tunneling of electrons at positive bias and dissociating polaronic Cooper pairs and large polarons at negative bias, and the gap inhomogeneity (i.e., multi-gap) picture. We show that the main features of the tunneling spectra such as low-bias U- and V-shaped features, asymmetry and high-bias dip-hump features, their temperature and doping dependences, and shoulders inside the conductance peaks observed in high-$T_c$ cuprates arise naturally fr…
Quantum vortex tunneling: Microscopic theory and application to d-wave superconductors
我们提出了一个微观的方法来量子隧穿的漩涡。形式主义的特点是在一个位置的涡旋的多体超导状态的速度，使过渡到第二个多体超导状态的涡旋在第二个位置。利用该理论研究了d波序参量对涡隧穿方向性的影响。
Tunneling conductance spectra of normal metal/insulator/superconductor (N/I/S) junctions are calculated to determine the potential of tunneling spectroscopy in investigations of topological superconductivity. Peculiar feature of topological superconductors is the formation of gapless edge states in them. Since the conductance of N/I/S junctions is sensitive to the formation of these edge states, topological superconductivity can be identified through edge-state detection. Herein, the effects of Fermi surface anisotropy and an applied magnetic field on the conductance spectra are analyzed to ga…
We study the tunneling conductance of a clean normal metal/chiral p-wave superconductor junction using the extended Blonder-Tinkham-Klapwijk formalism. It is shown that the spin-orbit coupling of the Rashba type that is present near the interface causes the subgap conductance peaks associated with the Andreev surface bound states to shift to a nonzero bias. We also investigate the effect of the Fermi wavevector mismatch between the normal metal and the superconductor.
Andreev bound states and tunneling characteristics of a non-centrosymmetric superconductor
研究了CePt3Si等非中心对称超导体与普通金属平面结的隧穿特性。结果表明，具有混合宇称的超导相在某些结方向上会产生零偏异常。这些零偏置异常的起源是界面处的Andreev束缚态。不同方向的隧穿特性允许测试奇偶混合配对态的结构。
We have derived new boundary conditions on wave function at the normal metal / superconductor (NS) interface beyond effective mass approximation. These conditions are based on tight-binding approach and enable one to formulate quantitative model for tunneling spectroscopy of superconductors with complex non-parabolic energy spectra. The model is applied to superconductors with unconventional pairing and with multiband electronic structure. In the case of single band unconventional superconductors this model provides known conductance formula (Phys. Rev. Lett. 74 3451 1995), but with generalize…
Theory of Scanning Tunneling Microscopy Probe of Impurity States in a D-Wave Superconductor
扫描隧道显微镜可以为高温超导体中准粒子态的详细研究提供探针。我们建议，它也可以用来获取有关杂质诱导准粒子态和超导序参量结构的具体信息。特别是，局域态密度被发现是敏感的杂质诱导的共振和对称性的序参量。
Recent advances in the development of Josephson scanning tunneling spectroscopy (JSTS) have opened a new path for the exploration of unconventional superconductors. We demonstrate that the critical current, $I_c$, measured via JSTS, images the spatial form of the superconducting order parameter in $d_{x^2-y^2}$-wave superconductors around defects and in the Fulde-Ferrell-Larkin-Ovchinnikov state. Moreover, we show that $I_c$ probes the existence of phase-incoherent superconducting correlations in the pseudo-gap region of the cuprate superconductors, thus providing unprecedented insight into it…
Nonconstant electronic density of states tunneling inversion for A15 superconductors: Nb3Sn
我们重新检查A15超导体的隧穿数据进行广义McMillan-Rowell隧穿反演，采用了非恒定的电子态密度从能带结构计算。对于Nb 3Sn，我们发现，通过考虑态密度中的尖锐结构，可以稍微改善与实验数据的拟合，但很可能仅凭这样的分析不足以完全解释这种材料的超导隧穿特性。然而，提取的Eliashberg函数显示了预期存在于最高质量Nb 3Sn样品中的许多特征。
Tunneling spectroscopy of $sπ$ pairing state as a model for FeAs superconductors
本文用Bogoliubov-de Gennes自洽方法计算了FeAs超导体的双带超导$sπ$对态。$sπ$状态是具有内部$π$相位的s波配对状态，即，每个带上的无节点间隙但具有相反的符号。通过计算$π$相超导体/正常金属双层膜的局域态密度，研究了该态的新特性。由于两种凝聚体之间的符号反转，出现了FeAs超导体隧道谱实验中观察到的零偏压电导峰。这消除了建立$sπ$态作为FeAs超导体的配对对称性的主要障碍。
We present very low temperature (0.15 K) scanning tunneling microscopy and spectroscopy experiments in the layered superconductor LaSb$_2$. We obtain topographic microscopy images with surfaces showing hexagonal and square atomic size patterns, and observe in the tunneling conductance a superconducting gap. We find well defined quasiparticle peaks located at a bias voltage comparable to the weak coupling s-wave BCS expected gap value (0.17 meV). The amount of states at the Fermi level is however large and the curves are significantly broadened. We find T$_c$ of 1.2 K by following the tunneling…
Generalized method of image and the tunneling spectroscopy in high-Tc superconductors
发展了一种广义镜像方法，研究了从金属到一类态的隧穿谱，其中充分考虑了紧束缚色散。反射对称性破缺是零偏压电导峰出现的必要条件。将该方法应用于d波超导体，得到了与ZBCP在磁场中分裂实验相一致的结果。此外，ZBCP被预测为隧穿到d密度波态的（110）方向，提供了在实验中寻找的签名。
We discuss electric transport through a point contact which bridges Majorana fermion modes appearing at edges of two helical superconductors. The contents focus on effects of interference and interaction unique to the Majorana fermions and role of spin-orbit interaction (SOI). Besides the Josephson current, the quasi-particle conductance depends sensitively on phase difference and relative helicity between the two superconductors. The interaction among the Majorana fermions causes the power-law temperature dependences of conductance for various tunneling channels. Especially, in the presence o…
Discrete-Lattice Model for Surface Bound States and Tunneling in d-Wave Superconductors
在离散晶格模型的$d_{x^2 - y^2}$铜氧化物超导体的表面束缚态被证明是，在一般情况下，相干叠加的传入激发和一个以上的传出激发，和一个简单的图形构造的基础上的表面布里渊区开发来描述它们的性质。此外，动量依赖于寿命的贡献，这些束缚态的宽度在隧道实验中观察到的推导和阐明的物理条款。
We have analyzed scanning tunneling spectra of two electron-doped cuprates Pr0.88LaCe0.12CuO4 (Tc = 21 K and 24 K) and compared them with tunneling spectrum of hole-doped La1.84Sr0.16CuO4 and effective electron-boson spectral function of hole-doped La1.97Sr0.03CuO4 (extracted from angle-resolved photoemission spectrum). We have also analyzed tunneling spectra and angle-resolved photoemission spectra for hole-doped Bi2Sr2CaCu2O8. These results unambiguously rule out magnetic pairing mechanism in both electron- and hole-doped cuprates and support polaronic/bipolaronic superconductivity in hole-d…
Magnetic Field Effect in Josephson tunneling between d-Wave Superconductors
研究了d波超导体间约瑟夫森隧穿的磁场效应。当一个（或每个）超导体相对于界面法线的晶体取向使得中间带隙态存在于界面处时，存在由于中间带隙态引起的隧穿电流分量。对于具有平面的连接{001}|{110}或{100}|{110}接口，该组件是对电流的主要贡献。预测的电流场的依赖性完全不同于传统的夫琅和费模式，在协议与已公布的测量。这是因为，除了夫琅和费因子之外，临界电流还取决于通过电流密度的磁场B，对于弱B，电流密度也是B的线性函数。
We study macroscopic quantum tunneling of interfaces separating normal and superconducting regions in type-I superconductors. Mathematical model is developed, that describes dissipative quantum escape of a two-dimensional manifold from a planar potential well. It corresponds to, e.g., a current-driven quantum depinning of the interface from a grain boundary or from artificially manufactured pinning layer. Effective action is derived and instantons of the equations of motion are investigated. Crossover between thermal activation and quantum tunneling is studied and the crossover temperature is …
Scanning Tunneling Spectroscopy on the novel superconductor CaC6
我们提出了新发现的超导体CaC $_6$的扫描隧道显微镜和光谱学。在3 ~ 15 K之间测量的隧道电导谱表明，准粒子态密度存在明显的超导能隙。从光谱中提取的能隙函数与传统的BCS理论符合得很好，其中$Δ(0)$ = 1.6 $\pm$ 0.2 meV。讨论了带隙各向异性和双带隙超导的可能性。在磁场中，涡旋的直接成像允许推导出ab平面中的相干长度$ξ_{ab}\simeq$ 33 nm。
We discuss the surface Andreev bound states in Fe-based superconductors with the use of an effective five-band model and investigate the surface-angle dependence of the tunneling spectroscopy by a quasiclassical approach for an isotropic and an anisotropic /pm s-wave gap superconductivity. We show that information on the normal state is important for the Andreev bound state and its peak positions do not depend on the gap amplitude anisotropy.
Domain walls can be formed in superconductors with a discrete degeneracy of the ground state, for instance, due to the breaking of time reversal symmetry. We study all cases where the formation of domain walls is possible in a tetragonal superconductor with the point group $D_{4h}$. We discuss both triplet and mixed singlet order parameters. It is found that in all cases the domain walls support subgap Andreev bound states, whose energies strongly depend on the direction of semiclassical propagation. The bound state contribution to the density of quasiparticle states exhibits peculiar features…
We use scanning tunneling microscopy/spectroscopy (STM/S) to elucidate the Cooper pairing of the iron pnictide superconductor Ba0.6K0.4Fe2As2. By a cold-cleaving technique, we obtain atomically resolved termination surfaces with different layer identities. Remarkably, we observe that the low-energy tunneling spectrum related to superconductivity has an unprecedented dependence on the layer-identity. By cross-referencing with the angle-revolved photoemission results and the tunneling data of LiFeAs, we find that tunneling on each termination surface probes superconductivity through selecting di…
Quantum tunneling of vortices in a MgB$_2$ superconductor
测量了MgB $_2$超导体的磁弛豫。在三种不同的磁场条件下，测定了标准化弛豫速率的温度依赖性。通过将这些速率外推到T = 0 K，我们发现这些外推不接近零，表明超导体中的涡旋的量子隧穿。提出了弛豫率的量子修正和磁矩的修正。利用量子修正，我们发现$U_0$随温度的降低而增加，并在T = 0时接近最大值。
Intervortex quasiparticle tunneling and electronic structure of multi-vortex configurations in type-II superconductors
本文研究了第二类超导体中多涡旋位形的电子能谱，并考虑了涡旋核之间的准粒子隧穿效应。隧穿是负责形成强耦合准粒子态的涡间距离$a<a_c$，其中的临界距离$a_c$是几个相干长度$ξ$的顺序。通过分析由准粒子隧穿结合的涡旋团的光谱，我们发现了从一组简并的Caroli-de Gennes - Matricon分支到类似于多量子巨涡旋中的异常分支的转变。这种谱变换导致费米能级上态密度随$a$的变化而振荡，并可在介观超导体和体系统中的无序磁通线阵列中观察到.
Theory of c-axis Josephson tunneling in d-wave superconductors
在扩展的Ambegaokar-Baratoff形式框架内，研究了层状d波超导体中c轴约瑟夫森电流和超流密度的温度和角度依赖性.特别地，考虑了角度相关的隧穿矩阵元素和晶界处的Andreev散射的影响。这些导致等离子体频率和约瑟夫森电流的低温行为的强修正。最近对铜氧化物高温超导体HgBa_2 CaCu_{1+δ}和Bi_2Sr_2CaCu_2 O_{8+δ}的c轴测量因此可以解释为与d波序参量一致。
Scanning tunneling spectroscopy of a-axis YBa_2Cu_3O_7-δfilms:k-selectivity and the shape of the superconductor
在4.2 K下使用STM对外延（100）取向的\chem{YBa_2Cu_3O_{7-δ}}膜进行了隧道谱分析。在原子光滑的区域，隧道光谱揭示明确的U形间隙与相对较低的零偏置电导进行了测量。只有当引入隧穿几率对波矢\emph{\textbf{k}}的强依赖性时，这些谱才能很好地拟合d波超导体的隧穿理论。这种\emph{\textbf{k}} -选择性STM测量的可能起源将被讨论。在其他区域，观察到V形间隙以及零偏压电导峰，分别表明\emph{\textbf{k}}选择性的弛豫和纳米刻面效应。
Coherent versus Incoherent c-Axis Josephson Tunneling Between Layered Superconductors
本文计算了相干和非相干电子隧穿穿过nu= s，d_x^2-y^2波超导半空间之间的c轴断裂结的Ic（T）和Rn，每个半空间的c轴带宽为2 J。相干准粒子隧穿仅在电压V<2 J/e时发生，导致难以测量欠掺杂样品的Rn。对于J/Delta_nu（0）<<1，Ic（0）的相干部分与Delta_nu（0）无关，并且可以很大。我们的结果进行了讨论，最近的实验。
Point-contact tunneling involving low-dimensional spin-triplet superconductors
我们修改和扩展以前的微观计算的基础上的非平衡格林函数形式主义的超导结隧穿，包括自旋三重态配对的情况下。我们发现，不同种类的结的I-V特性，特别是当考虑到磁场的影响，允许识别的类型的配对，存在鲜明的特点。我们讨论了准一维有机超导体如（TMTSF）_2（PF_6）和层状化合物如Sr_2RuO_4的相关性。
Tunneling spectroscopy for ferromagnet/superconductor junctions
在铁磁/超导（F/S）结的隧道谱研究中，自旋极化、F区和S区之间的费米波矢失配（FWM）以及界面电阻的影响起着至关重要的作用。我们研究了这些结的低偏压电导谱，由Andreev反射在F/S界面。我们考虑d波和s波超导体以及混合态的$d+is$形式。我们给出了相关参数值范围内的结果，并发现根据配对状态和其他条件，出现了丰富的特征。我们发现，在四波混频存在下，自旋极化可以增强Andreev反射，并引起一个零偏压电导峰的s波超导体。
We establish in a combination of ab initio theory and experiments that the tunneling process in scanning tunneling microscopy/spectroscopy on the A-122 iron pnictide superconductors - in this case BaFe$_{2-x}$Co$_x$As$_2$ - involve a strong adatom filtering of the differential conductance from the near-EF Fe3d states, which in turn originates from the top-most sub-surface Fe layer of the crystal. The calculations show that the dominance of surface Ba-related tunneling pathways leaves fingerprints found in the experimental differential conductance data, including large particle-hole asymmetry a…
Model for Tunneling-mediated Impurity Resonances in Bilayer Cuprate Superconductors
我们研究了双层铜氧化物表面层的隧穿介导局域态密度（LDOS），其中Zn杂质位于第二层Cu-O上。当两层Cu-O之间的隧穿强度大于某一临界值时，Zn杂质正上方的LDOS首先在费米面附近出现一个共振峰.隧穿强度越大，共振峰越强。研究还表明，共振峰的高度随着离Zn杂质正上方位置的距离而振荡下降。表面LDOS中的共振峰的位置取决于掺杂、能隙和隧穿强度，并且具有与其最近相邻位置上的偏压相反的偏压。这一结果可以通过STM实验进行验证，并可用于进一步了解高温超导体的电子性质。
We report experimental evidence of the effect of an applied magnetic field on the non-thermal magnetic relaxation in a disk-shaped type-I lead superconductor. The time evolution of the irreversible magnetization proves to be logarithmic for a wide range of temperatures and magnetic field values along the descending branch of the hysteresis cycle. When the intensity of the magnetic field increases, the crossover temperature separating the thermal and non-thermal regimes of magnetic relaxation is found to decrease, whereas the rate at which such relaxation occurs is observed to increase. These r…
Magnetization near a constriction between BCS superconductors by spin-dependent tunneling
该研究揭示了电压偏置下BCS超导体微收缩区的自旋依赖隧穿可打破电子-空穴隧穿对称性，解除相消干涉对自旋三重态Cooper对的形成阻断，实现静态磁化与类交流Josephson自旋电流，为电控无耗散自旋电子学提供了新实例。
Influence of impurity scattering on tunneling conductance in normal metal- d -wave superconductor junctions
本文研究了超导体中存在体杂质时正常金属/d波超导体结的超导电导谱。应用准经典理论计算了对势的空间变化，并通过t矩阵近似引入了杂质散射的影响。在界面处的次显性s波分量的幅度示出对杂质散射的鲁棒性，而次显性$d_{xy}$波分量的幅度随着杂质散射率的增加而被大大抑制。由于零能Andreev束缚态的零偏压电导峰显着加宽的情况下，玻恩极限杂质相比，幺正极限杂质。
The role of g-wave pairing and Josephson tunneling in high Tc superconductors
考虑了两口袋费米面对宏观量子现象的影响。我们证明了在双口袋费米面的情况下，g波配对是密切相关的d波之一。结果出现了两种宏观凝聚。这种双组分系统的约瑟夫森隧穿具有非常特殊的性质。我们证明了g波的存在并不与现有的隧穿实验数据相矛盾。我们还讨论了实验揭示g波分量的可能途径。
We used high-resolution scanning tunneling spectroscopy to study the hole-doped iron pnictide superconductor Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ ($T_c=38$ K). Features of a bosonic excitation (mode) are observed in the measured quasiparticle density of states. The bosonic features are intimately associated with the superconducting order parameter and have a mode energy of $\sim$14 meV, similar to the spin resonance measured by inelastic neutron scattering. These results indicate a strong electron-spin excitation coupling in iron pictnide superconductors, similar to that in high-$T_c$ copper ox…
The influence of the spin-dependent phase shifts (SDPS) associated to the electronic reflection and transmission amplitudes acquired by electrons upon scattering on the potential barrier on the Andreev reflection probability of electron and hole excitations for a ferromagnet/isolator/d-wave superconductor (FIS) contact and the charge conductance of the FIS contact is studied. Various superconductor orientations are considered. It is found that SDPS can suppress the zero-potential peak and restore finite-potential peaks in the charge conductance of the F/I/d-wave superconductor contact for the …
The influence of spin-dependent phases of tunneling electrons on the conductance of a point ferromagnet/isolator/d-wave superconductor contact
研究了在铁磁体/绝缘体/d波超导体（FIS）接触中，电子波通过势垒并被势垒反射后的相移对Andreev反射的影响。研究发现，在超导体中，由于Andreev反射的重复作用，类电子和类空穴准粒子相互干涉，在超导能隙内形成表面自旋相关的Andreev束缚态.（110）取向超导体的FIS接触在零电势处的电导峰值随着铁磁体极化的增加而迅速消失，而（100）取向超导体的FIS接触在零电势处的电导峰值出现。讨论了这种电导行为的物理原因。
Influence of impurity-scattering on tunneling conductance in d-wave superconductors with broken time reversal symmetry
基于Kubo公式和递归格林函数方法研究了杂质散射对污秽正常金属/绝缘体/超导体结隧穿电导的影响。零偏压电导峰（ZBCP）是超导体中非常规配对对称性的结果。正常金属中的杂质散射抑制了ZBCP的振幅。抑制程度与准经典格林函数理论的结果一致。当超导体具有$d$ +is-wave配对对称性时，超导体的时间反演对称性被破坏，ZBCP分裂成两个峰。杂质的随机散射降低了两个分裂峰的高度。然而，分裂峰的位置几乎保持不变，即使在存在强杂质散射。因此，两个分裂峰永远不会合并成一个ZBCP。
The determination of the electron-phonon interaction from tunneling data in the two-band superconductor MgB2
通过直接求解实轴两带Eliashberg方程（EE），计算了MgB 2在不同隧穿方向上的隧穿态密度（DOS）。然后，我们指出，如果将标准单带EE的数值反演应用于双带超导体MgB 2的DOS，可能会导致对提取的电子-声子谱函数α ^（2）F（ω）中某些声子分支（如E_2g）强度的错误估计。由双带相互作用产生的精细结构，原来是清楚地观察到只有沿ab平面在高品质的单晶隧穿。结果进行了比较，最近的实验数据。
In-plane Tunneling Spectrum into a [110]-Oriented High-$T_c$ Superconductor in the Pseudogap Regime
对赝能隙区[110]取向高温超导体的微分隧穿电导和表面局域态密度进行了理论研究。电荷密度波（CDW）、自旋密度波（SDW）、$d$密度波（DDW）和d波超导（DSC）有序作为PG态机制的竞争候选者，在隧穿电导中表现出不同的特征。对于CDW，SDW和DSC排序，隧道电导接近表面LDOS的势垒增加。对于DDW排序，我们首次表明，存在中间的间隙状态在[110]表面，表现为一个尖锐的零能量峰的LDOS，在DSC排序的情况下。然而，由于DDW状态的粒子-空穴对性质，这些状态不携带电流，因此不存在隧穿电导和表面LDOS之间的一一对应关系。
Based on a four-layered self-doped $t-J$ type model and the slave-boson mean-field approach, we study theoretically the superconductivity in the electron-doped and hole-doped layers. The neighbor layers are coupled through both the single electron interlayer hopping and pair tunneling effect. The superconducting gap magnitude for the electron-doped band is nearly twice of that of the hole-doped one, which contrasts to our previous understanding of the electron-hole asymmetry in high-T$_c$ superconductors but consistent with recent angle-resolved-photoemission-spectroscopy experiments in four-l…
The influence of spin-dependent phases of tunneling electrons on the conductance of a point ferromagnet/isolator/superconductor contact
本文给出了铁磁/绝缘体/超导体（FIS）接触中电子波在势垒中透射和反射时的Andreev反射几率，发现FIS接触中电子和空穴激发的Andreev反射几率是不同的。求出了Andreev束缚态的能级，计算了FIS点接触的弹道电导。
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