Two-dimensional electron liquid state at LaAlO3-SrTiO3 interfaces

TL;DR

This paper uses tunneling spectroscopy to analyze the spectral density of states in the two-dimensional electron system at LaAlO3-SrTiO3 interfaces, revealing unique electronic properties distinct from bulk materials and conventional semiconductor interfaces.

Contribution

It provides the first detailed spectral density of states measurement of the 2D electron liquid at LaAlO3-SrTiO3 interfaces, highlighting its qualitative differences from other electron systems.

Findings

Spectral density of states measured via tunneling spectroscopy.

Distinct electronic properties compared to bulk materials.

Differences from conventional semiconductor 2D electron gases.

Abstract

Using tunneling spectroscopy we have measured the spectral density of states of the mobile, two-dimensional electron system generated at the LaAlO3-SrTiO3 interface. As shown by the density of states the interface electron system differs qualitatively, first, from the electron systems of the materials defining the interface and, second, from the two-dimensional electron gases formed at interfaces between conventional semiconductors.