Berlin 2018 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 85: Focus Session: Emergent Phenomena in Driven Quantum Many-Body Systems (joint session DY/TT)
TT 85.6: Talk
Thursday, March 15, 2018, 11:15–11:30, EB 107
Time evolution, dynamics and control of edge states in laser-driven graphene nanoribbons — •Matteo Puviani1 and Andrea Bertoni2 — 1Università degli Studi di Modena e Raggio Emilia, Modena, Italy — 2CNR Institute of NanoSciences - S3, Modena, Italy
An intense laser field in the high-frequency regime drives carriers in graphene nanoribbons out of equilibrium and creates topologically-protected edge states. Based on a solution of the Floquet Hamiltonian we have studied these states in different regimes of intensity and polarization. We show that the time-dependent band structure contains many unconventional features that are not captured by considering the Floquet eigenvalues alone. By analyzing the evolution in time of the state population we have identified regimes for the emergence of time-dependent edge states responsible of charge oscillations across the ribbon. Furthermore, we show that they exhibit a robust dynamics also in the presence of very localized lattice defects, which is characteristic of topologically non-trivial behaviour. We eventually reveal how it is possible to control them applying an electrostatic potential barrier or creating a Quantum Point Contact, making them promising candidates for flying qubits architectures.