Seminar: "Topology- and geometry-driven effects in advanced micro- and nanoarchitectures", by Dr. Vladimir M. Fomin, Institute for Integrative Nanosciences, IFW Dresden, Germany

June 8, 2018  IMN Seminar Room, 12PM

An overview is given on topology- and geometry-driven effects owing to special geometries in real space, implemented by the high-tech self-organization techniques to fabricate micro- and nanoarchitectures. Rolled-up hybrid systems show fascinating potential in tailoring the electronic, optical and phonon properties because of varying contributions of individual components [1]. Combination of a geometric potential and an inhomogeneous twist renders an observation of the topology-driven effects in the electron ground-state energy in Möbius rings at the microscale into the area of experimental verification. In inhomogeneous Möbius rings, a “delocalization-to-localization” transition for the electron ground state unveils a new possibility to control the electronic energy spectra [2]. The rolled-up SiOx/SiO2 conical-shape asymmetric microcavities realize the spin–orbit interaction of light for the analysis of topological effects in the course of a non-Abelian evolution [3]. Robustness of the topologically induced geometric phase of light opens novel ways of manipulating photons and implies promising applications in on-chip quantum devices. The study of topology-driven effects (e.g., quantum interference) in doubly connected nanoarchitectures is enabled by fabrication of core-shell nanowires with high interface quality. An effective approach to manage the thermal conductivity of Si-based nanoarchitectures is implemented through the formation of radial Si/SiOx hybrid nanomembrane superlattices [4]. Theoretical analysis performed on a large interval of wave vectors and in a wide spectrum of frequencies implies, in accord with experiment, a prominent effect of the number of layers on the phonon energy dispersion and group velocity as well as on the phonon transport. The present work has been supported by the German Research Foundation (DFG) grants # FO 956/4-1, FO 956/5-1. Fruitful collaborations with A. A. Balandin, A. Cocemasov, S. Kiravittaya, P. M. Koenraad, G. Li, S. Li, L. Ma, O. Marquardt, A. Mavrokefalos, D. L. Nika, O. G. Schmidt, and F. Zhu are gratefully acknowledged.

References

[1] V. M. Fomin, in: A. Sidorenko (Ed.), Functional Nanostructures and Metamaterials: From Superconducting Qubits to Self-Organized Nanostructures (Springer, Berlin – Heidelberg, 2018) https://doi.org/10.1007/978-3-319-90481-8_10.

[2] V. M. Fomin (Ed.), Physics of Quantum Rings, 2nd edition (Springer, Berlin –Heidelberg, 2018) (in press).

[3] L. B. Ma, S. L. Li, V. M. Fomin, M. Hentschel, J. B. Götte, Y. Yin, M. R. Jorgensen, and O. G. Schmidt, Nature Communications 7, 10983 (2016).

[4] G. Li, M. Yarali, A. Cocemasov, S. Baunack, D. L. Nika, V. M. Fomin, S. Singh, T. Gemming, F. Zhu, A. Mavrokefalos, and O. G. Schmidt, ACS Nano 11, 8215 (2017).

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