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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 24: Organic Semiconductors

CPP 24.12: Vortrag

Mittwoch, 13. März 2013, 12:45–13:00, H40

Organic π-conjugated copolymers as molecular charge-qubits — •Cesar Augusto Mujica Martinez, Peter Nalbach, and Michael Thorwart — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraβe 9, 20355 Hamburg, Deutschland

Organic π-conjugated polymers are systems that combine the electronic properties of semiconductors and the mechanical properties of plastics. Similar to their inorganic semiconductor heterostructures counterparts, it is possible to control the spatial degrees of freedom of charge carriers by constructing unimolecular organic heterostructures from π-conjugated block copolymers. We propose a design for molecular charge-qubits based on poly-(p-phenylene) and poly-diacetylene π-conjugated heterostructures and determine their electronic structure as well as their vibrational active modes. By tuning the length of the constituent oligomers, the tunnel coupling in the charge qubit and its decoherence properties due to molecular vibrations can be chemically engineered. Long coherence times are observed even when the qubit is operated at room temperature. It is found that the molecular vibrational spectrum induces strong non-Markovian electronic effects which support the survival of quantum coherence.