scholarly journals Surface and Interface Superconductivity

2017 ◽  
Author(s):  
S. Gariglio ◽  
M.S. Scheurer ◽  
J. Schmalian ◽  
A.M.R.V.L. Monteiro ◽  
S. Goswami ◽  
...  
Keyword(s):  
Two Dimensions ◽  
Orbit Interaction ◽  
Pairing Symmetry ◽  
Oxide Materials ◽  
Phonon Modes ◽  
Surface And Interface ◽  
Surfaces And Interfaces ◽  
Rashba Spin ◽  
Interface Superconductivity ◽  
Superconducting Condensate

This article focuses on surface and interface superconductivity, a pivotal area of mesoscopic superconductivity. It discusses theoretical ideas regarding superconductivity in the 2D limit; pairing symmetry in systems with broken inversion symmetry and in the presence of Rashba spin–orbit interaction; and coupling of substrate phonon modes to layer electronic states to induce or enhance the superconducting condensate. It also reviews the experimental ongoing efforts to fabricate, characterize, and measure these systems, with particular emphasis on oxide materials. Superconductivity in two dimensions, in ultra-thin metals on Si(111), and at the LaAlO3/SrTiO3 interface is examined. The article concludes with an analysis of theoretical propositions aimed at realizing and testing novel superconducting states occurring at the surfaces and interfaces.

scholarly journals Gate-tunable giant nonreciprocal charge transport in noncentrosymmetric oxide interfaces

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Daeseong Choe ◽  
Mi-Jin Jin ◽  
Shin-Ik Kim ◽  
Hyung-Jin Choi ◽  
Junhyeon Jo ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Charge Transport ◽  
Two Dimensions ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Oxide Interface ◽  
Rectification Effect ◽  
Oxide Interfaces ◽  
Spin Orbit Interaction ◽  
Rashba Spin

Abstract A polar conductor, where inversion symmetry is broken, may exhibit directional propagation of itinerant electrons, i.e., the rightward and leftward currents differ from each other, when time-reversal symmetry is also broken. This potential rectification effect was shown to be very weak due to the fact that the kinetic energy is much higher than the energies associated with symmetry breaking, producing weak perturbations. Here we demonstrate the appearance of giant nonreciprocal charge transport in the conductive oxide interface, LaAlO3/SrTiO3, where the electrons are confined to two-dimensions with low Fermi energy. In addition, the Rashba spin–orbit interaction correlated with the sub-band hierarchy of this system enables a strongly tunable nonreciprocal response by applying a gate voltage. The observed behavior of directional response in LaAlO3/SrTiO3 is associated with comparable energy scales among kinetic energy, spin–orbit interaction, and magnetic field, which inspires a promising route to enhance nonreciprocal response and its functionalities in spin orbitronics.

scholarly journals Strain-enhanced giant Rashba spin splitting in ultrathin KTaO3 films for spin-polarized photocurrents

RSC Advances ◽  
2020 ◽  
Vol 10 (72) ◽  
pp. 44088-44095
Author(s):  
Ning Wu ◽  
Xue-Jing Zhang ◽  
Bang-Gui Liu
Keyword(s):  
First Principles ◽  
Biaxial Stress ◽  
Spin Splitting ◽  
Semiconductor Surfaces ◽  
Surfaces And Interfaces ◽  
Rashba Spin ◽  
Spin Polarized ◽  
Rashba Spin Splitting

Strong Rashba effects at semiconductor surfaces and interfaces have attracted attention for exploration and applications. We show with first-principles investigation that applying biaxial stress can cause tunable and giant Rashba effects in ultrathin KTaO3 (KTO) (001) films.

scholarly journals Spin filtering in a nonuniform quantum wire with Rashba spin–orbit interaction

2009 ◽  
Vol 373 (48) ◽  
pp. 4489-4492 ◽  
Author(s):  
Xianbo Xiao ◽  
Xiaomao Li ◽  
Yuguang Chen
Keyword(s):  
Quantum Wire ◽  
Orbit Interaction ◽  
Spin Orbit ◽  
Spin Orbit Interaction ◽  
Rashba Spin ◽  
Spin Filtering
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