Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Transport: Spintronics and magnetotransport (TT with HL)

HL 8.4: Vortrag

Montag, 16. März 2015, 10:15–10:30, A 053

Single atom memory described by the quantum master equation: Ho on Pt(111) — •Christian Karlewski^1,2, Michael Marthaler¹, Wulf Wulfhekel³, and Gerd Schön^1,2 — ¹TFP, Karlsruher Institut für Technologie — ²INT, Karlsruher Institut für Technologie — ³PHI, Karlsruher Institut für Technologie

Miniaturizing current memory bits to optimize the storage density is an important task of information technology research. The ultimate goal are single atoms as one bit. Single magnetic holmium atoms on a platinum (111) surface have been investigated in Nature 503, 242 (2013) and have highly stable magnetic moments, in or out of the plane. Stability can be maintained for several minutes, making holmium a great candidate as single atomic storage. The theoretical description of this system is based on the quantum master equation of open quantum systems. We will show that even if the system in total behaves as a classical bit with two states, a full quantum mechanical description is needed to catch the dynamics properly. The dependence of the lifetime of this system on different parameters is investigated and we will show that it might be possible to improve the properties of our system even further by understanding the mechanisms which at present limit the lifetimes.