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O: Fachverband Oberflächenphysik

O 50: Focussed Session: Majorana Fermions in Condensed Matter (jointly with DS, HL, MA, and TT)

O 50.3: Topical Talk

Wednesday, March 13, 2013, 16:00–16:30, H20

Adaptive Tuning of Majorana Fermions in a Quantum Dot Chain — •Anton Akhmerov — Harvard University, USA

I will explain how to overcome the obstacles that disorder and high density of states pose to the creation of unpaired Majorana fermions in one-dimensional systems. This is achieved by splitting the system into a chain of quantum dots, which are then tuned such that the chain can be viewed as an effective Kitaev chain with maximally localized Majorana fermions. Resonant Andreev spectroscopy allows us to make this tuning adaptive, so that each pair of dots may be tuned independently of the other. Our numerical simulations show that already in three quantum dots it is possible to have almost completely decoupled Majorana fermions.