Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Graphene is probably the most fascinating material ever discovered, but it has a drawback: it does not exhibit the quantum spin Hall effect. By creating honeycomb lattices of compounds other than carbon, novel materials with unexpected properties may emerge. A key question is: if we build a honeycomb lattice out of semiconducting nanocrystals, is it going to behave like graphene or like the semiconducting building blocks?
I will show that these systems, which were recently experimentally synthesized [1], combine the best of the two materials. They exhibit a gap at zero energy, as well as Dirac cones at finite energies. In addition, a honeycomb lattice made of CdSe nanocrystals displays topological properties in the valence band [2], whereas for HgTe very large topological gaps are predicted to occur in the conduction p-bands [3]. These artificial materials open the possibility to engineer high-orbital physics with Dirac electrons and to realize quantum (spin) Hall phases at room-T [3].
Then, I will discuss the effect of dynamical electromagnetic interactions in massive and massless 2D systems like transition-metal dichalcogenides and graphene. By using the pseudo-QED approach, quantized edge states emerge and give rise, respectively, to a quantum Hall Effect (massive) [4] and a quantum Valley Hall effect (massless) [5], as a consequence of the parity anomaly.
[1] M. P. Boneschanscher et al., Science 344, 1377 (2014).
[2] E. Kalesaki et al., Phys. Rev. X 4, 011010 (2014).
[3] W. Beugeling et al., Nature Communications 6, 6316 (2015).
[4] L.O. Nascimento et al., arXiv:1702.01573
[5] E. C. Marino et al., Phys. Rev. X 5, 011040 (2015).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.