79 citations · 433 across the 23 of their papers we have counts for
23 papers
Theory of Majorana zero modes in unconventional superconductors
Yukio Tanaka, Shun Tamura, Jorge Cayao
Majorana fermions are spin-1/2 neutral particles that are their own antiparticles and were initially predicted by Ettore Majorana in particle physics but their observation still re…
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…
Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
Takeshi Mizushima, Shun Tamura, Keiji Yada +1
We investigate emergent odd-frequency pairs and proximity effect in nematic and chiral states of superconducting topological insulators (STIs), such as BiSe ( Cu,…
Generation of polarized spin-triplet Cooper pairings by magnetic barriers in superconducting junctions
Shun Tamura, Yukio Tanaka, Takehito Yokoyama
We investigate the proximity effect in an s-wave superconductor/ferromagnetic metal with a Rashba spin-orbit coupling/diffusive normal metal junction and an s-wave superconductor/n…
Odd-frequency pairing inherent in Bogoliubov Fermi liquid
Tatsuya Miki, Shun-Ta Tamura, Shoma Iimura +1
The disorder and interaction effects on Bogoliubov-Fermi surfaces with preserved inversion symmetry are studied for a low-energy effective model coupled to bosonic degrees of freed…
Generalization of spectral bulk-boundary correspondence
Shun Tamura, Shintaro Hoshino, Yukio Tanaka
The bulk-boundary correspondence in one dimension asserts that the physical quantities defined in the bulk and at the edge are connected, as well established in the argument for el…
Impact of impurity scattering on odd-frequency spin-triplet pairing near the edge of the Kitaev chain
Sparsh Mishra, Shun Tamura, Akito Kobayashi +1
We study a Kitaev chain model, which is the simplest model of topological superconductors hosting Majorana fermion, appearing as a zero-energy state at the edge. We analytically ca…
Thermoelectric detection of Andreev states in unconventional superconductors
Tony Savander, Shun Tamura, Christian Flindt +2
We theoretically describe a thermoelectric effect that is entirely due to Andreev processes involving the formation of Cooper pairs through the coupling of electrons and holes. The…
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…
Electronic multipoles and multiplet pairs induced from Pomeranchuk and Cooper instabilities of Bogoliubov Fermi surfaces
Shun-Ta Tamura, Shoma Iimura, Shintaro Hoshino
It has recently been pointed out that Fermi surfaces can remain even in the superconductors under the symmetric spin-orbit interaction and broken time-reversal symmetry. Using the…
Bulk odd-frequency pairing in the superconducting Su-Schrieffer-Heeger model
Shun Tamura, Sho Nakosai, Annica M. Black-Schaffer +2
The Su-Schrieffer-Heeger model describes fermions that hop on a one-dimensional chain with staggered hopping amplitude, where the unit cell contains two sites, or two sublattices.…
Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry
Yuri Fukaya, Shun Tamura, Keiji Yada +3
The spin-orbital polarization of superconducting excitations in momentum space is shown to provide distinctive marks of unconventional pairing in the presence of inversion symmetry…
Odd-frequency pairing and proximity effect in Kitaev chain systems including topological critical point
Daijiro Takagi, Shun Tamura, Yukio Tanaka
In this paper, we investigate the relation between odd-frequency pairing and proximity effect in non-uniform Kitaev chain systems with a particular interest in the topological crit…
Odd-Frequency Pairs in Chiral Symmetric Systems: Spectral Bulk-Boundary Correspondence and Topological Criticality
Shun Tamura, Shintaro Hoshino, Yukio Tanaka
Odd-frequency Cooper pairs with chiral symmetry emerging at the edges of topological superconductors are a useful physical quantity for characterizing the topological properties of…
Theory of proximity effect in two-dimensional unconventional superconductor with Rashba spin-orbit interaction
Shun Tamura, Yukio Tanaka
We study the anomalous proximity effect in diffusive normal metal (DN)/unconventional superconductor junctions, where the local density of states (LDOS) in the DN has a zero-energy…
Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
Yuri Fukaya, Shun Tamura, Keiji Yada +3
We study the superconducting state of multi-orbital spin-orbit coupled systems in the presence of an orbitally driven inversion asymmetry assuming that the inter-orbital attraction…
Current fluctuations in unconventional superconductor junctions with impurity scattering
Pablo Burset, Bo Lu, Shun Tamura +1
The order parameter of bulk two-dimensional superconductors is classified as nodal, if it vanishes for a direction in momentum space, or gapful if it does not. Each class can be to…
Staggered Flux State in Two-Dimensional Hubbard Models
Hisatoshi Yokoyama, Shun Tamura, Masao Ogata
The stability and other properties of a staggered flux (SF) state or a correlated d-density wave state are studied for the Hubbard (t-t'-U) model on extended square lattices, as a…
Theory of surface Andreev bound states and tunneling spectroscopy in three-dimensional chiral superconductors
Shun Tamura, Shingo Kobayashi, Lu Bo +1
We study the surface Andreev bound states (SABSs) and quasiparticle tunneling spectroscopy of three-dimensional (3D) chiral superconductor by changing the surface (interface) misor…
Drude and Superconducting Weights and Mott Transitions in Variation Theory
Shun Tamura, Hisatoshi Yokoyama
Drude weight () is a useful measure to distinguish a metal from an insulator. However, has not been justifiably estimated by the variation theory for long, since Millis and…
Variational Approach to Localization Length for Two-Dimensional Hubbard Model
Shun Tamura, Yokoyama Hisatoshi
As a measure to ascertain whether a system is metallic or insulating, localization length , which represents the spread of electron distribution, can be a useful quantity, esp…
Variational study of conduction in doped Mott insulator in terms of kinetic energy
H. Yokoyama, S. Tamura, K. Kobayashi +1
The kinetic features of holes (electrons) in the Hubbard model are studied using a variational Monte Carlo method. In doped Mott insulators (U>U_co), holes are classified, in the s…
Variational Monte Carlo Study of Spin-Gapped Normal State and BCS-BEC Crossover in Two-Dimensional Attractive Hubbard Model
Shun Tamura, Hisatoshi Yokoyama
We study properties of normal, superconducting (SC) and CDW states for an attractive Hubbard model on the square lattice, using a variational Monte Carlo method. In trial wave func…