Impurity Effects on Superconductivity on Surfaces of Topological Insulators
スポンサーリンク
概要
- 論文の詳細を見る
A two-dimensional superconductor (SC) on surfaces of topological insulators (TIs) is a mixture of s-wave and helical p-wave components when induced by s-wave interactions, since spin and momentum are correlated. On the basis of the Abrikosov--Gor'kov theory, we reveal that unconventional SCs on the surfaces of TIs are stable against time-reversal symmetric (TRS) impurities within a region of small impurity concentration. Moreover, we analyze the stability of the SC on the surfaces of TIs against impurities beyond the perturbation theory by solving the real-space Bogoliubov--de Gennes equation for an effective tight-binding model of a TI. We find that the SC is stable against strong TRS impurities. The behaviors of bound states around an impurity suggest that the SC on the surfaces of TIs is not a topological SC.
- 2012-08-15
著者
-
Imada Masatoshi
Department Of Applied Physics University Of Tokyo
-
Yamaji Youhei
Department Of Applied Physics University Of Tokyo
-
Ito Yuto
Department of Applied Physics, University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
関連論文
- Ab initio Derivation of Low-Energy Model for Iron-Based Superconductors LaFeAsO and LaFePO(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Pairing of Fermious Coupled with Spin-1/2 Heisenberg System : Exact Diagonalization Study for Mechanism of High-T_c Superconductivity
- Drude Weight of the Two-Dimensional Hubbard Model : Reexamination of Finite-Size Effect in Exact Diagonalization Study(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- On the Kinetic Equations for Binary Mixtures
- Antiferromagnetic Ising Model on Inverse Perovskite Lattice(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Variational Monte Carlo Method Combined with Quantum-Number Projection and Multi-Variable Optimization(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- On the Mechanism of High-T_c Superconductivity
- Variational Monte Carlo Study of Electron Differentiation around Mott Transition(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Ground State Properties of the Coupled Spin-Fermion Model in the Weak Kondo Coupling Region
- YbRh_2Si_2 : Quantum Tricritical Behavior in Itinerant Electron Systems(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Quantum Metamagnetic Transitions Induced by Changes in Fermi-Surface Topology : Applications to a Weak Itinerant-Electron Ferromagnet ZrZn_2(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Quantum and Topological Criticalities of Lifshitz Transition in Two-Dimensional Correlated Electron Systems(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Quantum Critical "Opalescence" around Metal-Insulator Transitions(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Numerical Studies on the Hubbard Model and the t-J Model in One- and Two-Dimensions
- On Proximity of 4/7 Solid Phase of ^3He Adsorbed on Graphite : Origin of Specific-Heat Anomalies in Hole-Doped Density-Ordered Solid(Condensed matter: structure and mechanical and thermal properties)
- Does Simple Two-Dimensional Hubbard Model Account for High-T_c Superconductivity in Copper Oxides?(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
- Stability of Unconventional Superconductivity on Surfaces of Topological Insulators
- Spin Fluctuation Theory for Quantum Tricritical Point Arising in Proximity to First-Order Phase Transitions: Applications to Heavy-Fermion Systems, YbRh2Si2, CeRu2Si2, and $\beta$-YbAlB4
- Magnetic Properties of Ab initio Model of Iron-Based Superconductors LaFeAsO
- What is Minimal Model of ^3He Adsorbed on Graphite? : Importance of Density Fluctuations in 4/7 Registered Solid(Condensed matter : structure and mechanical and thermal properties)
- A New Hybrid Algorithm for Fermion Simulations Applied to the Hubbard Model
- Mass Dependence of the Sputtering Yield-Boundary Effect
- Linear Response of One Dimensional Nonlinear System. II
- Effect of Randomness on Charge Density Wave and Superconductivity in Strong Coupling Electron Systems
- Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe, and FeTe: Electron Correlation and Covalency
- Ab initio Low-Dimensional Physics Opened Up by Dimensional Downfolding: Application to LaFeAsO
- Low Temperature Properties of the Random Triangular Antiferromagnet
- Theory of Central Peak in Quasi-One-Dimensional Ferroelectric Systems : Application to C_sD_2PO_4
- A Fermion Simulation Algorithm by Molecular Dynamics Techique Combined with Monte Carlo Method
- Magnetization Step in Spatially Distorted Heisenberg Kagomé Antiferromagnets
- Ab initio Low-Energy Model of Transition-Metal-Oxide Heterostructure LaAlO3/SrTiO3
- Gaussian-Basis Monte Carlo Method for Numerical Study on Ground States of Itinerant and Strongly Correlated Electron Systems(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
- Impurity Effects on Superconductivity on Surfaces of Topological Insulators
- Systematic Control of Doped Carrier Density without Disorder at Interface of Oxide Heterostructures
- Ab initio Derivation of Low-Energy Model for $\kappa$-ET Type Organic Conductors
- Molecular Dynamics Study of the φ^4 Chain
- Single-Particle Excitations under Coexisting Electron Correlation and Disorder: A Numerical Study of the Anderson–Hubbard Model
- Topological Insulators from Spontaneous Symmetry Breaking Induced by Electron Correlation on Pyrochlore Lattices