TY - JOUR
T1 - Detecting Majorana modes through Josephson junction ring-quantum dot hybrid architectures
AU - Rodríguez-Mota, Rosa
AU - Vishveshwara, Smitha
AU - Pereg-Barnea, T.
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/5
Y1 - 2019/5
N2 - Unequivocal signatures of Majorana zero energy modes in condensed matter systems and manipulation of the associated electron parity states are highly sought after for fundamental reasons as well as for the prospect of topological quantum computing. In this paper, we demonstrate that a ring of Josephson coupled topological superconducting islands threaded by magnetic flux and attached to a quantum dot acts as an excellent parity-controlled probe of Majorana mode physics. As a function of flux threading through the ring, standard Josephson coupling yields a Φ0=h/(2e) periodic features corresponding to 2π phase difference periodicity. In contrast, Majorana mode assisted tunneling provides additional features with 2Φ0 (4π phase difference) periodicity, associated with single electron processes. We find that increasing the number of islands in the ring enhances the visibility of the desired 4π periodic components in the groundstate energy. Moreover as a unique characterization tool, tuning the occupation energy of the quantum dot allows controlled groundstate parity changes in the ring, enabling a toggling between Φ0 and 2Φ0 periodicity.
AB - Unequivocal signatures of Majorana zero energy modes in condensed matter systems and manipulation of the associated electron parity states are highly sought after for fundamental reasons as well as for the prospect of topological quantum computing. In this paper, we demonstrate that a ring of Josephson coupled topological superconducting islands threaded by magnetic flux and attached to a quantum dot acts as an excellent parity-controlled probe of Majorana mode physics. As a function of flux threading through the ring, standard Josephson coupling yields a Φ0=h/(2e) periodic features corresponding to 2π phase difference periodicity. In contrast, Majorana mode assisted tunneling provides additional features with 2Φ0 (4π phase difference) periodicity, associated with single electron processes. We find that increasing the number of islands in the ring enhances the visibility of the desired 4π periodic components in the groundstate energy. Moreover as a unique characterization tool, tuning the occupation energy of the quantum dot allows controlled groundstate parity changes in the ring, enabling a toggling between Φ0 and 2Φ0 periodicity.
KW - Josephson junctions
KW - Majorana modes
KW - Phase slips
KW - Quantum dots
KW - Topological superconductors
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U2 - 10.1016/j.jpcs.2018.02.017
DO - 10.1016/j.jpcs.2018.02.017
M3 - Article
AN - SCOPUS:85042180842
SN - 0022-3697
VL - 128
SP - 179
EP - 187
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
ER -