81 citations · 384 across the 32 of their papers we have counts for
33 papers
Pressure-induced superconductivity in a bilayer metal
Tomoya Sano, Satoshi Ikegaya, Shingo Kobayashi +1
We propose a model that explains the mechanism of pressure-induced superconductivity in a bilayer metal. Four types of pair potentials are assumed for a Cooper pair consisting of t…
Nonlocal Cooper pairs in finite topological superconductors and their relation to Majorana nonlocality
Hiroto Mizoguchi, Yutaro Nagae, Yasuhiro Asano +1
We identify two fundamental properties of the Gor'kov Green's function of finite one-dimensional topological superconductors. In the low-frequency (low-energy) regime, the normal a…
Robust realization of spin-polarized specular Andreev reflection in VO-based altermagnets
Yutaro Nagae, Andreas P. Schnyder, Satoshi Ikegaya
We theoretically investigate charge transport in a junction between a conventional superconductor and a VO-based altermagnet exhibiting distinctive spin-split quasi-one-dimensi…
Reentrant Superconductivity in Zeeman Fields
Tomoya Sano, Kota Tabata, Satoshi Ikegaya +1
We propose a theoretical model for a superconductor that exhibits the reentrant superconductivity in Zeeman fields. The Bogoliubov-de Gennes Hamiltonian includes three vectors in s…
Exceptionally large winding number of a finite-size topological superconductor
Satoshi Ikegaya, Shingo Kobayashi, Yasuhiro Asano
We study finite-size-induced topological phenomena in unconventional superconductors. Specifically, we focus on a thin film with a persistent spin texture, fabricated on a high-$T_…
Noise-to-current ratio divergence as a fingerprint of dispersing Majorana edge modes
Leo Katayama, Andreas P. Schnyder, Yasuhiro Asano +1
The definitive detection of Majorana modes in topological superconductors is a key issue in condensed matter physics. Here we propose a smoking-gun experiment for the detection of…
Majorana flat bands and anomalous proximity effects in -wave magnet--superconductor hybrid systems
Yutaro Nagae, Leo Katayama, Satoshi Ikegaya
Flat-band Majorana bound states of nodal -wave superconductors give rise to striking electromagnetic anomalies, reflecting their high degree of degeneracy at the Fermi level. Ho…
Anomalous proximity effect of a spin-singlet superconductor with a spin-orbit interaction
Jaechul Lee, Satoshi Ikegaya, Yasuhiro Asano
The anomalous proximity effect of a spin-triplet -wave superconductor has been known as a part of the Majorana physics and is explained by the penetration of zero-energy states…
Thermoelectric effect in a superconductor with Bogoliubov Fermi surfaces
Tomoya Sano, Takumi Sato, Akihiro Sasaki +3
We study theoretically the thermoelectric effect in a superconducting state having the Bogoliubov-Fermi surfaces which stays in a thin superconducting layer between a conventional…
Spin-polarized Specular Andreev Reflections in Altermagnets
Yutaro Nagae, Andreas P. Schnyder, Satoshi Ikegaya
We show theoretically that specular Andreev reflection occurs stably at altermagnet--superconductor interfaces, which is a phenomenon that has previously been predicted only in a l…
Oscillating-charged Andreev Bound States and Their Appearance in UTe
Satoshi Ando, Shingo Kobayashi, Andreas P. Schnyder +2
Surface Andreev bound states, including Majorana bound states in topological superconductors, are typically charge neutral. In this work, we demonstrate the emergence of unconventi…
Multi-locational Majorana Zero Modes
Yutaro Nagae, Andreas P. Schnyder, Yukio Tanaka +2
We show the appearance of an unconventional Majorana zero mode whose wave function splits into multiple parts located at different ends of different topological superconductors, he…
Tunable Josephson diode effect on the surface of topological insulators
Bo Lu, Satoshi Ikegaya, Pablo Burset +2
The Josephson rectification effect, where the resistance is finite in one direction while zero in the other, has been recently realized experimentally. The resulting Josephson diod…
Surface State of Inter-orbital Pairing State in SrRuO Superconductor
Satoshi Ando, Satoshi Ikegaya, Shun Tamura +2
We study the (001) surface state of a recently proposed symmetry inter-orbital-odd spin-triplet s-wave superconducting (SC) state in SrRuO (SRO). We confirm that this…
Destruction of surface states of ()-wave superconductor by surface roughness: application to SrRuO
Shu-Ichiro Suzuki, Satoshi Ikegaya, Alexander A. Golubov
The fragility of the chiral surface current of ()-wave superconductor, a potential candidate for SrRuO, against surface roughness is demonstrated utilizing…
Anomalous Fano factor as a signature of Bogoliubov Fermi surfaces
Sayan Banerjee, Satoshi Ikegaya, Andreas P. Schnyder
Noise spectroscopy is a key technique to investigate the nature and dynamics of charge carriers in superconductors. The recently discovered superconducting hybrids with Bogoliubov…
Flat-band Majorana bound states in topological Josephson junctions
Daisuke Oshima, Satoshi Ikegaya, Andreas P. Schnyder +1
Nodal topological superconductors characterized by -wave pairing symmetry host flat-band Majorana bound states causing drastic anomalies in low-energy electromagnetic response…
Fingerprints of possible even-parity superconducting states in SrRuO detected by planar tunneling spectroscopy
Satoshi Ikegaya, Shu-Ichiro Suzuki, Yukio Tanaka +1
After more than 25 years of research, three even-parity superconducting states -- the -wave, -wave, and -wave states -- have emerged as leading candidates for the…
Strong anomalous proximity effect from spin-singlet superconductors
Satoshi Ikegaya, Jaechul Lee, Andreas P. Schnyder +1
The proximity effect from a spin-triplet -wave superconductor to a dirty normal-metal has been shown to result in various unusual electromagnetic properties, reflecting a coop…
Tunable Majorana corner modes in noncentrosymmetric superconductors: Tunneling spectroscopy and edge imperfections
S. Ikegaya, W. B. Rui, D. Manske +1
Majorana corner modes appearing in two-dimensional second-order topological superconductors have great potential applications for fault-tolerant topological quantum computations. W…
Odd-parity pairing correlations in a d-wave superconductor
Jaechul Lee, Satoshi Ikegaya, Yasuhiro Asano
We theoretically study the effects of spin-orbit interactions on symmetry of a Cooper pair in a spin-singlet d-wave superconductor in two-dimension. The pairing symmetry is analyze…
Anomalous Proximity Effect of Planer Topological Josephson Junctions
Satoshi Ikegaya, Shun Tamura, Dirk Manske +1
The anomalous proximity effect in dirty superconducting junctions is one of most striking phenomena highlighting the profound nature of Majorana bound states and odd-frequency Coop…
Nodal Andreev Spectra in Multi-Majorana Three-Terminal Josephson Junctions
Keimei Sakurai, Maria Teresa Mercaldo, Shingo Kobayashi +6
We investigate the Andreev-bound-state (ABS) spectra of three-terminal Josephson junctions which consist of 1D topological superconductors (TSCs) harboring multiple zero-energy edg…
Identification of Spin-Triplet Superconductivity through a Helical-Chiral Phase Transition in SrRuO Thin-Films
S. Ikegaya, K. Yada, Y. Tanaka +3
Despite much effort for over the two decades, the paring symmetry of a SrRuO superconductor has been still unclear. In this Rapid Communication, motivated by the recent rap…