Tunable superconductivity at the oxide-insulator/KTaO$_3$ interface and its origin

  title={Tunable superconductivity at the oxide-insulator/KTaO\$\_3\$ interface and its origin},
  author={Changjiang Liu and Xianjing Zhou and Deshun Hong and Brandon Fisher and Hong Zheng and John Pearson and Dafei Jin and Michael R. Norman and Anand Bhattacharya},
Superconductivity forms out of the condensation of Cooper pairs of electrons. The mechanism by which Cooper pairs are created in non-conventional superconductors is often elusive because experimental signatures that connect a specific pairing mechanism to the properties of superconducting state are rare. The recently discovered superconducting oxide-insulator/KTaO$_3$ interface may offer clues about its origins. Here we observe distinct dependences of the superconducting transition temperature… 

Quasi-two-dimensional superconductivity at oxide heterostructures

Oxide interfaces manifest many fascinating phenomena with synergetic correlations among multiple degrees of freedom, including the interplay of broken symmetry, lattice mismatch, charge transfer,

Superfluid stiffness of a KTaO3-based two-dimensional electron gas

After almost twenty years of intense work on the celebrated LaAlO3/SrTiO3system, the recent discovery of a superconducting two-dimensional electron gas (2-DEG) in (111)-oriented KTaO3-based

Tunable two-dimensional superconductivity and spin-orbit coupling at the EuO/KTaO3(110) interface

Unconventional quantum states, most notably the two-dimensional (2D) superconductivity, have been realized at the interfaces of oxide heterostructures where they can be effectively tuned by the gate

Transport behaviors of topological band conduction in KTaO3’s two-dimensional electron gases

Two-dimensional electron gas systems (2DEGs) generated at the oxide interfaces that exhibit rich physics phenomena opened up an era for oxide-based electronics, photonics, and spintronics. The recent

Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate

SrTiO 3 is known for its proximity to a ferroelectric phase and for showing an “optimal” doping for superconductivity with a characteristic dome-like behaviour resembling systems close to a quantum

Anisotropic superconductivity at KTaO3(111) interfaces

A two-dimensional, anisotropic superconductivity was recently found at the KTaO3(111) interfaces. The nature of the anisotropic superconducting transition remains a subject of debate. To investigate



Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid

The recent discovery of superconductivity at the interfaces between KTaO3 and EuO (or LaAlO3) gives birth to the second generation of oxide interface superconductors. This superconductivity exhibits

Two-dimensional superconductivity and anisotropic transport at KTaO3 (111) interfaces

In EuO/KTaO3 (111) samples, a spontaneous in-plane transport anisotropy is observed before the onset of superconductivity, suggesting the emergence of a distinct “stripe”-like phase, which is revealed near the critical field.

Superconductor-Metal Quantum Transition at the EuO/KTaO3 Interface

Superconductivity has been one of the most fascinating quantum states of matter for over several decades. Among the superconducting materials, LaAlO3/SrTiO3 interface is of particularly interest

Electric field control of superconductivity at the LaAlO3/KTaO3(111) interface

By applying a gate voltage (VG) across KTaO3, the interface can be continuously tuned from superconducting into insulating states, yielding a dome-shaped Tc-VG dependence, where Tc is the transition temperature.

Discovery of superconductivity in KTaO₃ by electrostatic carrier doping.

The present result clearly shows that electrostatic carrier doping can lead to new states of matter at nanoscale interfaces and can induce superconductivity in KTaO(3), a material in whichsuperconductivity has not been observed before.

Two-Dimensional Superconductivity at the LaAlO_{3}/KTaO_{3}(110) Heterointerface.

We report on the observation of a T_{c}∼0.9  K superconductivity at the interface between LaAlO_{3} film and the 5d transition metal oxide KTaO_{3}(110) single crystal. The interface shows a large

Quantum Critical Origin of the Superconducting Dome in SrTiO_{3}.

A model in which the soft mode fluctuations provide the pairing interaction for superconductivity carriers is suggested, and it is predicted that the highest critical temperature will increase and shift to lower carrier doping with increasing ^{18}O isotope substitution, a scenario that is experimentally verifiable.

Electric-field-induced superconductivity in an insulator.

Electric-field-induced superconductivity in an insulator is reported by using an electric-double-layer gating in an organic electrolyte using a pristine SrTiO(3) single-crystal channel, indicating this method as promising for searching for unprecedented superconducting states.

Unconventional superconductivity in magic-angle graphene superlattices

The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.