Journal
PROGRESS IN SURFACE SCIENCE
Volume 92, Issue 1, Pages 40-82Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.progsurf.2016.12.001
Keywords
Decoherence; Relaxation; Kondo; Adatoms; Spin-phonon
Categories
Funding
- MEC-Spain [FIS2013-47328-C2-2-P]
- Generalitat Valenciana, Prometeo [ACOMP/2010/070]
- ERDF funds through the Portuguese Operational Program for Competitiveness and Internationalization COMPETE 2020
- National Funds through FCT - The Portuguese Foundation for Science and Technology [PTDC/FIS-N AN/4662/2014 (016656)]
- Ministerio de Economia y Competitividad (MINECO, Spain) [MAT2015-66888-C3-2-R]
- Gobierno Vasco [IT986-16]
- SPICE workshop on Magnetic adatoms as building blocks for quantum magnetism
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We review the problem of spin decoherence of magnetic atoms deposited on a surface. Recent breakthroughs in scanning tunnelling microscopy (STM) make it possible to probe the spin dynamics of individual atoms, either isolated or integrated in nanoengineered spin structures. Transport pump and, probe techniques with spin polarized tips permit measuring the spin relaxation time T-1 while novel demonstration of electrically driven STM single spin resonance has provided a direct measurement of the spin coherence time T-2 of an individual magnetic adatom. Here we address the problem of spin decoherence from the theoretical point of view. First we provide a short general overview of decoherence in open quantum systems and we discuss with some detail ambiguities that arise in the case of degenerate spectra, relevant for magnetic atoms. Second, we address the physical mechanisms that allows probing the spin coherence of magnetic atoms on surfaces. Third, we discuss the main spin decoherence mechanisms at work on a surface, most notably, Kondo interaction, but also spin-phonon coupling and dephasing by Johnson noise. Finally, we briefly discuss the implications in the broader context of quantum technologies. (C) 2016 Elsevier Ltd. All rights reserved.
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