Infinite critical boson non-Fermi liquid on heterostructure interfaces

TL;DR

This paper investigates how an infinite set of critical boson modes at heterostructure interfaces induce non-Fermi liquid behavior in electrons, revealing a new regime with distinct magnetic and electronic properties.

Contribution

It introduces a theoretical framework for non-Fermi liquids driven by critical boson contours at heterostructure interfaces, highlighting a novel z=3 regime with specific resistivity scaling.

Findings

Existence of a z=3 non-Fermi liquid regime controlled by critical boson contours.

Resistivity exhibits a characteristic temperature scaling in this regime.

Critical boson modes significantly influence electron scattering and quantum criticality.

Abstract

We study the emergence of non-Fermi liquid on heterostructure interfaces where there exists an infinite number of critical boson modes accounting for the magnetic fluctuations in two spatial dimensions. The interfacial Dzyaloshinskii-Moriya interaction naturally arises in magnetic interactions due to the absence of inversion symmetry, resulting in a degenerate contour for the low-energy bosonic modes in the momentum space which simultaneously becomes critical near the magnetic phase transition. The itinerant electrons are scattered by the critical boson contour via the Yukawa coupling. When the boson contour is much smaller than the Fermi surface, it is shown that, there exists a regime with a dynamic critical exponent z=3 while the boson contour still controls the low-energy magnetic fluctuations. Using a self-consistent renormalization calculation for this regime, we uncover a prominent non-Fermi liquid behavior in the resistivity with a characteristic temperature scaling power. These findings open up new avenues for understanding boson-fermion interactions and the novel fermionic quantum criticality.