Journal
NATURE MATERIALS
Volume 13, Issue 11, Pages 1026-1032Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT4073
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Funding
- Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001088]
- Department of Energy [FG02-97ER25308]
- Defense Threat Reduction Agency [HDTRA1-10-1-0046]
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The control of exciton transport in organic materials is of fundamental importance for the development of efficient light-harvesting systems. This transport is easily deteriorated by traps in the disordered energy landscape. Here, we propose and analyse a system that supports topological Frenkel exciton edge states. Backscattering of these chiral Frenkel excitons is prohibited by symmetry, ensuring that the transport properties of such a system are robust against disorder. To implement our idea, we propose a two-dimensional periodic array of tilted porphyrins interacting with a homogeneous magnetic field. This field serves to break time-reversal symmetry and results in lattice fluxes that mimic the Aharonov-Bohm phase acquired by electrons. Our proposal is the first blueprint for realizing topological phases of matter in molecular aggregates and suggests a paradigm for engineering novel excitonic materials.
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