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We used the proximity effect as a tool to achieve an ideal (barrier - free) NS boundary for quantitative evaluation of transport phenomena that accompany converting dissipative current into supercurrent in NS systems with unconventional…

Superconductivity · Physics 2015-06-15 Yu. N. Chiang , M. O. Dzuba , O. G. Shevchenko , A. N. Vasiliev

We study theoretically proximity-induced superconductivity and ferromagnetism on the surface of a topological insulator. In particular, we investigate how the Andreev-bound states are influenced by the interplay between these phenomena,…

Superconductivity · Physics 2015-05-18 Jacob Linder , Yukio Tanaka , Takehito Yokoyama , Asle Sudbø , Naoto Nagaosa

The interplay between superconductivity and ferromagnetism has long been pursued as a route to unconventional Josephson effects, yet suitable material platforms remain limited. Here we report Josephson junctions based on epitaxial…

We show that an in-plane magnetic field can drive two-dimensional spin-orbit-coupled systems under superconducting proximity effect into a gapless phase where parts of the normal state Fermi surface are gapped, and the ungapped parts are…

Superconductivity · Physics 2018-07-03 Noah F. Q. Yuan , Liang Fu

GeTe is a chemically simple IV-VI semiconductor which bears a rich plethora of different physical properties induced by doping and external stimuli. These include, among others, ferromagnetism, ferroelectricity, phase-change memory…

We theoretically demonstrate unusual features of superconducting proximity effect in gapped graphene which presents a pseudospin symmetry-broken ferromagnet with a net pseudomagnetization. We find that the presence of a band gap makes the…

Mesoscale and Nanoscale Physics · Physics 2015-06-11 Leyla Majidi , Malek Zareyan

The proximity induced pair potential in a topological insulator-superconductor hybrid features an interesting superposition of a conventional spin-singlet component from the superconductor and a spin-triplet one induced by the surface state…

Mesoscale and Nanoscale Physics · Physics 2015-11-24 Pablo Burset , Bo Lu , Grigory Tkachov , Yukio Tanaka , Ewelina M. Hankiewicz , Bjoern Trauzettel

The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal metal. In addition recently superconducting junctions using…

Mesoscale and Nanoscale Physics · Physics 2023-09-25 Sadashige Matsuo , Kento Ueda , Shoji Baba , Hiroshi Kamata , Mizuki Tateno , Javad Shabani , Christopher J. Palmstrøm , Seigo Tarucha

We study the superconducting proximity effect in an InAs nanowire contacted by Ta-based superconducting electrodes. Using local bottom gates, we control the potential landscape along the nanowire, tuning its conductance to a quasi-ballistic…

Mesoscale and Nanoscale Physics · Physics 2019-07-09 J. C. Estrada Saldaña , R. Žitko , J. P. Cleuziou , E. J. H. Lee , V. Zannier , D. Ercolani , L. Sorba , R. Aguado , S. De Franceschi

The Josephson effect describes the generic appearance of a supercurrent in a weak link between two superconductors. Its exact physical nature however deeply influences the properties of the supercurrent. Detailed studies of Josephson…

Introduction of a Josephson field effect transistor (JoFET) concept sparked active research on proximity effects in semiconductors. Induced superconductivity and electrostatic control of critical current has been demonstrated in…

Mesoscale and Nanoscale Physics · Physics 2019-06-26 Zhong Wan , Aleksandr Kazakov , Michael J. Manfra , Loren N. Pfeiffer , Ken W. West , Leonid P. Rokhinson

As a half-metal is spin-polarized at its Fermi level by definition, it was conventionally thought to have little proximity effect to an s-wave superconductor. Here we show that, with interface spin-orbit coupling, $p_x +ip_y$…

Superconductivity · Physics 2015-03-17 Suk Bum Chung , Hai-Jun Zhang , Xiao-Liang Qi , Shou-Cheng Zhang

In the new van der Waals Kondo-lattice Fe$_3$GeTe$_2$, itinerant ferromagnetism and heavy fermionic behaviour coexist. Both the key properties of such a system namely a spin-polarized Fermi surface and a low Fermi momentum are expected to…

We study the influence of the inverse proximity effect on the superconductivity nucleation in hybrid structures consisting of the semiconducting nanowires placed in contact with a thin superconducting film and discuss the resulting…

Superconductivity · Physics 2018-04-17 Alexander A. Kopasov , Ivan M. Khaymovich , Alexander S. Mel'nikov

Conventional spin-singlet superconductivity that deeply penetrates into ferromagnets is typically killed by the exchange interaction, which destroys the spin-singlet pairs. Under certain circumstances, however, superconductivity survives…

Mesoscale and Nanoscale Physics · Physics 2019-03-27 Taketomo Nakamura , Le Duc Anh , Yoshiaki Hashimoto , Shinobu Ohya , Masaaki Tanaka , Shingo Katsumoto

Hybrid samples combining superconductors with magnetic topological insulators are a promising platform for exploring exotic new transport physics. We examine a Josephson junction of such a system, based on the dilute magnetic topological…

Mesoscale and Nanoscale Physics · Physics 2022-04-27 Pankaj Mandal , Nicolai Taufertshöfer , Lukas Lunczer , Martin P. Stehno , Charles Gould , Laurens W. Molenkamp

Non-centrosymmetric superconductors exhibit the magnetoelectric effect which manifests itself in the appearance of the magnetic spin polarization in response to a dissipationless electric current (supercurrent). While much attention has…

Mesoscale and Nanoscale Physics · Physics 2017-01-09 G. Tkachov

Time reversal symmetry breaking in superconductors, resulting from external magnetic fields or spontaneous magnetization, often leads to unconventional superconducting properties. In this way, a conventional Fulde-Ferrell-Larkin-Ovchinnikov…

The hope to realize Majorana fermions at the vortex core of a two dimensional topological superconductor has led to a variety of proposals for devices which exhibit topological superconductivity. Many of these include superconductivity…

Strongly Correlated Electrons · Physics 2014-11-05 Aaron Farrell , T. Pereg-Barnea

Recently topological superconducting states has attracted a lot of interest. In this work, we consider a topo- logical superconductor with $Z_2$ topological mirror order [1] and s$\pm$-wave superconducting pairing symmetry, within a…

Superconductivity · Physics 2015-11-18 Yuan-Yen Tai , Hongchul Choi , Towfiq Ahmed , C. S. Ting , Jian-Xin Zhu
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