The role of the spin in quasiparticle interference

TL;DR

This paper demonstrates that quasiparticle spin significantly influences interference patterns observed in STM, especially in non-magnetic systems with spin-split surface states, requiring spin considerations for accurate interpretation.

Contribution

It reveals the crucial role of quasiparticle spin in shaping interference patterns, highlighting the need to include spin-conserving scattering in analysis of STM data.

Findings

Interference patterns on Bi(110) are affected by quasiparticle spin.

Features expected in spin-independent models are absent.

Spin-conserving scattering explains observed patterns.

Abstract

Quasiparticle interference patterns measured by scanning tunneling microscopy (STM) can be used to study the local electronic structure of metal surfaces and high temperature superconductors. Here, we show that even in non-magnetic systems the spin of the quasiparticles can have a profound effect on the interference patterns. On Bi(110), where the surface state bands are not spin-degenerate, the patterns are not related to the dispersion of the electronic states in a simple way. In fact, the features which are expected for the spin-independent situation are absent and the observed interference patterns can only be interpreted by taking spin-conserving scattering events into account.