Optical conductivity of the $t_{2g}$ two-dimensional electron gas

Abstract

Motivated by recent interest in perovskite surfaces and heterostructures, we present an analysis of the Kubo conductivity of a two-dimensional electron gas (2DEG) formed in the $t_{2g}$ bands of an oxide with perovskite structure. We find that when the electric field is polarized in the plane of the 2DEG, the optical conductivity is dominated by nearly independent Drude contributions from two-dimensional subband Fermi surfaces, whereas for perpendicular-to-plane polarization it has strong intersubband features. Our analysis suggests that perpendicular-to-plane optical conductivity studies may help advance understanding of the interplay between lattice distortions and electron-electron interactions in complex oxide 2DEG quantum confinement physics.

References in corpus (10)

• Magnetic effects at the interface between nonmagnetic oxides
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: The role of oxygen vacancies and electronic reconstruction
• Electron-phonon interaction and charge carrier mass enhancement in SrTiO3
• Theory of t2g electron-gas Rashba interactions
• Charge induced coherence between intersubband plasmons in a quantum structure
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Carrier-controlled ferromagnetism in SrTiO3
• Shubnikov-de Haas effect in low electron density SrTiO3: Conduction band edge of SrTiO3 redux
• Charge density distribution and optical response of the LaAlO3/SrTiO3 interface

Cited by in corpus (2)

• Drude weight and optical conductivity of a two-dimensional heavy-hole gas with $k$-cubic spin-orbit interactions
• Two-dimensional electron gas in a metal/amorphous oxide interface with spin orbit interaction