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Realization of a vortex in the Kekule texture of molecular Graphene, at a Y junction where 3 domains meet

Bergman, Doron L. (2013) Realization of a vortex in the Kekule texture of molecular Graphene, at a Y junction where 3 domains meet. Physical Review B, 87 (3). Art. No. 035422. ISSN 1098-0121. doi:10.1103/PhysRevB.87.035422.

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Following the recent realization of an artificial version of Graphene in the electronic surface states of copper with judiciously placed carbon monoxide molecules inducing the honeycomb lattice symmetry (K. K. Gomes et al., Nature 483, 306 (2012)), we demonstrate that these can be used to realize a vortex in a Kekule texture of the honeycomb lattice. The Kekule texture is mathematically analogous to a superconducting order parameter, opening a spectral gap in the massless Dirac point spectrum of the Graphene structure. The core of a vortex in the texture order parameter, supports subgap states, which for this system are analogs of Majorana fermions in some superconducting states. In particular, the electron charge bound to a single vortex core is effectively fractionalized to a charge of e/2. The Kekule texture as realized in the molecular Graphene system realizes 3 different domain types, and we show that a Y-junction between them realizes the coveted Kekule vortex.

Item Type:Article
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URLURL TypeDescription Paper
Alternate Title:Realization of a vortex in the Kekule texture of artificial Graphene, at a Y junction where 3 domains
Additional Information:© 2013 American Physical Society. Received 5 July 2012; published 22 January 2013. D.L.B. was supported by the Sherman Fairchild Foundation and acknowledges the hospitality of the Freiburg Institute of Advanced Studies (FRIAS), where this work was conceived and carried out. Finally, we wish to thank Hari Manoharan for readily discussing his experiments.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
Sherman Fairchild FoundationUNSPECIFIED
Issue or Number:3
Classification Code:PACS number(s): 73.20.−r, 73.63.−b, 73.61.−r, 73.21.−b
Record Number:CaltechAUTHORS:20121102-105221702
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35264
Deposited By: Tony Diaz
Deposited On:03 Nov 2012 04:57
Last Modified:09 Nov 2021 23:13

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