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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Fermi nesting between atomic wires with strong spin-orbit coupling.

C Tegenkamp¹, D Lükermann, H Pfnür

¹Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany. tegenkamp@fkp.uni-hannover.de

Physical Review Letters

|February 2, 2013

Summary

Atomic Pb wires on Si(557) exhibit a correlated spin and charge state due to superlattice effects. This leads to spin-polarized charge-density waves and significant Rashba splitting, impacting spin transport.

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Area of Science:

Condensed Matter Physics
Materials Science
Surface Science

Background:

Superlattice structures influence electronic properties.
Spin-orbit coupling is crucial for spin states.
Atomic wires offer unique electronic phenomena.

Purpose of the Study:

Investigate the electronic spin and charge state in atomic Pb wires on Si(557).
Explore the interplay of superlattice structure, band filling, and spin-orbit coupling.
Understand the resulting spin texture and charge-density waves.

Main Methods:

Spin- and angle-resolved photoemission spectroscopy (SARPES).
Fabrication of atomic Pb wires on a Si(557) surface.

Main Results:

Observed a highly correlated electronic spin and charge state.
Identified alternating and equidistant spin texture near the Fermi surface.
Demonstrated Fermi nesting leading to spin-polarized charge-density waves across wires.
Measured an extraordinary large Rashba splitting (Δk0=0.2 Å⁻¹).

Conclusions:

The findings fit models of spin-density waves in antiferromagnetic chain structures.
The results suggest implications for spin-polarized transport along the wires.