Two dimensional electron gas in the $\delta$-doped iridates with strong spin–orbit coupling: La$_\delta$Sr2IrO4

Bhandari, Churna; Satpathy, Sashi

doi:10.1088/1361-648X/ab2f3f

Title: Two dimensional electron gas in the $$\delta$$-doped iridates with strong spin–orbit coupling: La$$_\delta$$Sr₂IrO₄

Abstract

Iridates are of significant current interest because of the strong spin–orbit coupling that leads to a variety of new phenomena. Using density-functional studies, we suggest the formation of a spin-orbital entangled two dimensional electron gas (2DEG) in the -doped iridate La$$_\delta$$Sr₂IrO₄, where a single SrO layer is replaced by a LaO layer. The extra La electron resides close to the$$\delta$$-doped layer, partially occupying the J_eff = 1/2 upper Hubbard band and thereby making the interface metallic. The magnetic structure of the bulk is destroyed near the interface, with the Ir₀ layer closest to the interface becoming non-magnetic, while the next layer (Ir₁) continues to maintain the AFM structure of the bulk, but with a reduced magnetic moment. The Fermi surface consists of a hole pocket and an electron pocket, located in two different Ir layers (Ir₀ and Ir₁), with both carriers derived from the J_eff = 1/2 upper Hubbard band. The presence of both electrons and holes at the $$\delta$$-doped interface suggests unusual transport properties, leading to possible device applications.

Authors:

^[1];

^[1]

Univ. of Missouri, Columbia, MO (United States)

Publication Date:: 2019-10-30

Research Org.:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

OSTI Identifier:: 1603372

Grant/Contract Number:: FG02-00ER45818

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. Condensed Matter

Additional Journal Information:: Journal Volume: 31; Journal Issue: 43; Journal ID: ISSN 0953-8984

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; spin–orbit coupling; delta-doping; 2DEG; Fermi surface; Sr2IrO4; iridate

Citation Formats


                    Bhandari, Churna, and Satpathy, Sashi. Two dimensional electron gas in the $\delta$-doped iridates with strong spin–orbit coupling: La$_\delta$Sr2IrO4.  United States: N. p., 2019. 
Web.  doi:10.1088/1361-648X/ab2f3f.

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                    Bhandari, Churna, & Satpathy, Sashi. Two dimensional electron gas in the $\delta$-doped iridates with strong spin–orbit coupling: La$_\delta$Sr2IrO4.  United States.  https://doi.org/10.1088/1361-648X/ab2f3f

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                    Bhandari, Churna, and Satpathy, Sashi. Wed .  
"Two dimensional electron gas in the $\delta$-doped iridates with strong spin–orbit coupling: La$_\delta$Sr2IrO4".  United States.  https://doi.org/10.1088/1361-648X/ab2f3f.  https://www.osti.gov/servlets/purl/1603372.

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@article{osti_1603372,

  title        = {Two dimensional electron gas in the $\delta$-doped iridates with strong spin–orbit coupling: La$_\delta$Sr2IrO4},

  author       = {Bhandari, Churna and Satpathy, Sashi},

  abstractNote = {Iridates are of significant current interest because of the strong spin–orbit coupling that leads to a variety of new phenomena. Using density-functional studies, we suggest the formation of a spin-orbital entangled two dimensional electron gas (2DEG) in the -doped iridate La$_\delta$Sr2IrO4, where a single SrO layer is replaced by a LaO layer. The extra La electron resides close to the$\delta$-doped layer, partially occupying the Jeff = 1/2 upper Hubbard band and thereby making the interface metallic. The magnetic structure of the bulk is destroyed near the interface, with the Ir0 layer closest to the interface becoming non-magnetic, while the next layer (Ir1) continues to maintain the AFM structure of the bulk, but with a reduced magnetic moment. The Fermi surface consists of a hole pocket and an electron pocket, located in two different Ir layers (Ir0 and Ir1), with both carriers derived from the Jeff = 1/2 upper Hubbard band. The presence of both electrons and holes at the $\delta$-doped interface suggests unusual transport properties, leading to possible device applications.},

  doi          = {10.1088/1361-648X/ab2f3f},

  journal      = {Journal of Physics. Condensed Matter},

  number       = 43,

  volume       = 31,

  place        = {United States},

  year         = {2019},

  month        = {10}

}

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Title: Two dimensional electron gas in the $$\delta$$-doped iridates with strong spin–orbit coupling: La$$_\delta$$Sr2IrO4

Abstract

Citation Formats

Epitaxy-distorted spin-orbit Mott insulator in Sr 2 IrO 4 thin films journal, February 2013

Computational Design of Axion Insulators Based on 5 d Spinel Compounds journal, April 2012

Spin-orbit tuned metal-insulator transitions in single-crystal Sr 2 Ir 1 − x Rh x O 4 ( 0 ≤ x ≤ 1 ) journal, September 2012

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Title: Two dimensional electron gas in the $$\delta$$-doped iridates with strong spin–orbit coupling: La$$_\delta$$Sr₂IrO₄

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Projector augmented-wave method
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Tuning electronic structure via epitaxial strain in Sr ₂ IrO ₄ thin films
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Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates
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Correlated Quantum Phenomena in the Strong Spin-Orbit Regime
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Wedge-Shaped Potential and Airy-Function Electron Localization in Oxide Superlattices
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journal, February 2020

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Weak ferromagnetism, metal-to-nonmetal transition, and negative differential resistivity in single-crystal ${Sr}_{2} {IrO}_{4}$
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text, January 2014

Epitaxial growth and thermodynamic stability of SrIrO3/SrTiO3 heterostructures
text, January 2016

Electronic structure and optical properties of Sr$_2$IrO$_4$ under epitaxial strain
text, January 2018

Stability of the Antiferromagnetic State in the Electron Doped Iridates
text, January 2018