Topological states at the (001) surface of SrTiO3

Abstract

Defect-free SrTiO3 (STO) is a band insulator but Angle Resolved Photoemission Spectroscopy (ARPES) experiments have demonstrated the existence of a nanometer thin two-dimensional electron liquid (2DEG) at the (001) oriented surface of this compound. The bulk is a trivial insulator, but our theoretical study reveals that the parity of electronic wavefunctions in this 2DEG is inverted in the vicinity of special points in reciprocal space where the low-energy dispersion consists of four gapped Dirac cones with a tilted and anisotropic shape. This gives rise to linearly dispersing topological edge states at the one-dimensional boundary. We propose to probe these modes by measuring the Josephson radiation from gapless bound Andreev states in STO based junctions, as it is predicted that they display distinctive signatures of topology.

10 pages, 6 figures

References in corpus (11)

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Cited by in corpus (16)

• Spin and orbital Edelstein effect in an oxide two-dimensional electron gas: theory and application to AlO${}_x$/SrTiO${}_3$
• One-Dimensional Nature of Pairing and Superconductivity at the LaAlO${}_3$/SrTiO${}_3$ Interface
• Evolution of topological superconductivity by orbital selective confinement in oxide nanowires
• Metal/SrTiO${}_3$ two-dimensional electron gases for spin-to-charge conversion
• Tunable spin and orbital Edelstein effect at (111) LaAlO${}_3$/SrTiO${}_3$ interface
• Hallmarks of non-trivial topology in Josephson junctions based on oxide nanochannels
• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well
• Strain-induced topological phase transition at (111) SrTiO${}_3$-based heterostructures
• Ballistic transport through quantum point contacts of multi-orbital oxides
• Spin-orbital polarization of Majorana edge states in oxides nanowires
• Spin texture driven spintronic enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface
• Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
• Theoretical analysis of the inverse Edelstein effect at the LaAlO${}_3$ / SrTiO${}_3$ interface with an effective tight-binding model: Important role of the second $d_{xy}$ subband
• Spin-Hall Current and Nonlocal Transport in Ferromagnet-Free Multi-band models for SrTiO3-Based Nanodevices in the presence of impurities
• Rashba splitting in polar-nonpolar sandwich heterostructure : A DFT Study
• Spontaneous nonreciprocal transport in a gate-tunable ferromagnetic Rashba 2-dimensional electron gas