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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Surface dead layer for quasiparticles near a mott transition.

Giovanni Borghi¹, Michele Fabrizio, Erio Tosatti

¹International School for Advanced Studies (SISSA), and CRS Democritos, CNR-INFM, Via Beirut 2-4, I-34014 Trieste, Italy.

Physical Review Letters

|March 5, 2009

Summary

This summary is machine-generated.

A surface dead layer forms in solids as electron quasiparticles weaken near a Mott metal-insulator transition. This dead layer

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Area of Science:

Condensed matter physics
Materials science

Background:

Correlations weaken electron quasiparticles in solids approaching a Mott metal-insulator transition.
This weakening is linked to phenomena observed at the material's surface.

Purpose of the Study:

To investigate the formation and properties of a surface dead layer.
To understand the relationship between bulk properties and surface phenomena near a Mott transition.

Main Methods:

Utilizing a Hubbard model.
Employing a self-consistent Gutzwiller approximation.

Main Results:

A dead layer forms below the surface, exponentially suppressing quasiparticles.
The dead layer depth is a bulk property and diverges as the Mott transition is approached.

Conclusions:

The study presents a physical picture for the surface dead layer phenomenon.
Experimental photoemission data in V2O3 supports the theoretical findings.