Effect of multiband transport on charge carrier density fluctuations at the LaAlO3/SrTiO3 interface

@article{Daptary2018EffectOM,
  title={Effect of multiband transport on charge carrier density fluctuations at the 
LaAlO3/SrTiO3
 interface},
  author={Gopi Nath Daptary and Pramod Kumar and Anjana Dogra and Aveek Bid},
  journal={Physical Review B},
  year={2018}
}
Multiband transport in superconductors is interesting both from an academic as well as an application point of view. It has been postulated that interband scattering can significantly affect the carrier dynamics in these materials. In this article we present a detailed study of the electrical transport properties of the high-mobility two-dimensional electron gas residing at the interface of LaAlO$_3$/SrTiO$_3$, a prototypical multi-band superconductor. We show, through careful measurements of… 
5 Citations

Figures from this paper

Resistance fluctuation spectroscopy of thin films of 3D topological insulator BiSbTeSe1.6
Despite several years of studies, the origin of slow-kinetics of charge-carriers at the surface-states of strong topological insulators remains abstruse. In this article, we report on studies of
Effect of spin-orbit interaction on the vortex dynamics in LaAlO3/SrTiO3 interfaces near the superconducting transition
Controlling spin-orbit interaction and its effect on superconductivity has been a long-standing problem in two-dimensional inversion symmetry broken superconductors. An open challenge is to
Probing defect states in few-layer MoS2 by conductance fluctuation spectroscopy
Despite the concerted effort of several research groups, a detailed experimental account of defect dynamics in high-quality single-and few-layer transition-metal dichalcogenides remains elusive. In
Tuning the carrier density in SrTiO3/LaTiO3/SrTiO3 quantum wells
We discuss methods of built-in carrier density control in SrTiO3/LaTiO3/SrTiO3 heterostructures that exhibit quasi-two-dimensional carrier confinement in an interfacial quantum well. Unlike the
LaScO3/SrTiO3: A conducting polar heterointerface of two 3d band insulating perovskites
This work reports a quasi-two-dimensional electron gas (q-2DEG) system at the interface of two wideband-gap insulators, (TiO2-terminated) SrTiO3 and LaScO3, with a minimum thickness of 4-unit cell

References

SHOWING 1-10 OF 76 REFERENCES
A universal critical density underlying the physics of electrons at the LaAlO₃/SrTiO₃ interface.
TLDR
It is shown, using magnetotransport measurements, that a universal Lifshitz transition between d orbitals of different symmetries lies at the core of the observed phenomena, and the fascinating behaviour observed so far in these oxides follows from a small but fundamental set of bands.
Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices
TLDR
This work reports on the realisation of a field-effect LaAlO3/SrTiO3 device, whose physical properties, including superconductivity and SOC, can be tuned over a wide range by a top-gate voltage and derives a phase diagram, which emphasises aField-effect-induced superconductor-to-insulator quantum phase transition.
Probing transport mechanisms of BaFe2As2 superconducting films and grain boundary junctions by noise spectroscopy
TLDR
The dc transport and voltage-noise properties of Co-doped BaFe2As2 superconducting films with artificial grain boundary junctions have been investigated and possible theoretical interpretation of these phenomena is proposed.
Observation of transient superconductivity at the LaAlO3/SrTiO3 interface
We report the observation of a magnetic-field-assisted transient superconducting state in the two-dimensional electron gas existing at the interface of LaAlO3/SrTiO3 heterostructures. This metastable
Gate-tunable polarized phase of two-dimensional electrons at the LaAlO3/SrTiO3 interface
TLDR
Two distinct phases in the space of carrier density and magnetic field are identified and the observed interplay between the two phases indicates the nature of magnetism at the LaAlO3/SrTiO3 interface as both having an intrinsic origin and being tunable.
Electric field control of the LaAlO3/SrTiO3 interface ground state
TLDR
The electrostatic tuning of the carrier density allows an on/off switching of superconductivity and drives a quantum phase transition between a two-dimensional superconducting state and an insulating state, which opens the way to the development of new mesoscopicsuperconducting circuits.
Interface superconductor with gap behaviour like a high-temperature superconductor
TLDR
Tunnel spectroscopy with planar junctions is used to measure the behaviour of the electronic spectral density of states as a function of carrier density, implying that the smooth continuation of the superconducting gap into pseudogap-like behaviour could be a general property of 2D superconductivity.
Two-dimensional quantum oscillations of the conductance at LaAlO3/SrTiO3 interfaces.
TLDR
This observation directly indicates the formation of a two-dimensional electron gas originating from quantum confinement at the interface of LaAlO3 /SrTiO3 interfaces characterized by mobilities of the order of several thousands cm2/V s.
Enhanced spin-orbit coupling and charge carrier density suppression in LaAl1-xCrxO3/SrTiO3 hetero-interfaces.
TLDR
Analysis of data in the framework of Maekawa-Fukuyama theory allows extraction of the SOI critical field (H(SO) and time scale (τ(SO)) whose evolution with Cr concentration is similar as with the increasing negative gate voltage in LAO/STO interface.
A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface
TLDR
A model interface is examined between two insulating perovskite oxides—LaAlO3 and SrTiO3—in which the termination layer at the interface is controlled on an atomic scale, presenting a broad opportunity to tailor low-dimensional charge states by atomically engineered oxide heteroepitaxy.
...
1
2
3
4
5
...