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Related Experiment Video

Updated: Apr 15, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Published on: June 9, 2023

Giant oscillating thermopower at oxide interfaces.

Ilaria Pallecchi¹, Francesca Telesio¹, Danfeng Li²

¹Department of Physics, CNR-SPIN and Genova University, via Dodecaneso 33, Genova 16146, Italy.

Nature Communications

|March 28, 2015

Summary

This summary is machine-generated.

Investigating thermopower in LaAlO3/SrTiO3 heterostructures reveals a localized Anderson tail. This finding clarifies charge carrier behavior in two-dimensional electron liquids under gate voltage control.

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Area of Science:

Condensed Matter Physics
Materials Science
Oxide Heterostructures

Background:

The nature of charge carriers at the LaAlO3/SrTiO3 interface is crucial for understanding charge confinement in oxide heterostructures.
Previous studies have explored the electronic properties of this interface, but a complete picture of charge carrier behavior remains elusive.

Purpose of the Study:

To investigate the electronic structure of the LaAlO3/SrTiO3 interface at low temperatures using thermopower measurements.
To understand the role of gate field in modulating the charge carrier behavior and electronic states.

Main Methods:

Low-temperature thermopower measurements as a function of gate voltage applied to the LaAlO3/SrTiO3 heterostructure.
Analysis of thermopower magnitude and oscillations to probe the electronic structure and charge density.

Main Results:

Under negative gate voltage, thermopower exhibited large negative values (10^4-10^5 microVK^-1), indicating a phonon-drag contribution.
Regular oscillations in thermopower as a function of gate voltage were observed, correlating with Fermi level descent.
These oscillations provide evidence for a dense array of localized states at the bottom of the Ti 3d conduction band.

Conclusions:

The study provides direct evidence for a localized Anderson tail in the two-dimensional electron liquid at the LaAlO3/SrTiO3 interface.
Thermopower measurements are a powerful tool for probing electronic states and charge carrier localization in oxide heterostructures.