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Bipolar spin blockade and coherent state superpositions in a triple quantum dot | | M. Busl
; G. Granger
; L. Gaudreau
; R. Sánchez
; A. Kam
; M. Pioro-Ladrière
; S. A. Studenikin
; P. Zawadzki
; Z. R. Wasilewski
; A. S. Sachrajda
; G. Platero
; | | Date: |
19 Oct 2013 | | Abstract: | Spin qubits based on interacting spins in double quantum dots have been
successfully demonstrated. Readout of the qubit state involves a conversion of
spin to charge information, universally achieved by taking advantage of a spin
blockade phenomenon resulting from Pauli’s exclusion principle. The archetypal
spin blockade transport signature in double quantum dots takes the form of a
rectified current. Currently more complex spin qubit circuits including triple
quantum dots are being developed. Here we show both experimentally and
theoretically (a) that in a linear triple quantum dot circuit, the spin
blockade becomes bipolar with current strongly suppressed in both bias
directions and (b) that a new quantum coherent mechanism becomes relevant.
Within this mechanism charge is transferred non-intuitively via coherent states
from one end of the linear triple dot circuit to the other without involving
the centre site. Our results have implications in future complex
nano-spintronic circuits. | | Source: | arXiv, 1310.5269 | | Services: | Forum | Review | PDF | Favorites | |
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