Entity

Time filter

Source Type


Garcia-Frutos E.M.,CSIC - Institute of Materials Science
Journal of Materials Chemistry C | Year: 2013

1D π-conjugated organic micro- or nanostructures keep all the advantages found in organic single crystals, e.g. high crystallinity, but without the tricky growth associated with large-sized crystals. They also present low-cost processing, solution processable materials, and large-area fabrication, and are compatible with flexible substrates. Electronic and optical properties of 1D π-conjugated organic micro- and nanomaterials can be tuned by changing their size at the central core or chemical modification of the aromatic substituents, among other alternatives. Current challenges are to find and develop an accurate control of the morphology, size, degree of uniformity, and alignment of the micro- and nanometer-sized organic single crystals, for future applications in miniaturized devices. © 2013 The Royal Society of Chemistry. Source


Rurali R.,Autonomous University of Barcelona | Rurali R.,CSIC - Institute of Materials Science
Reviews of Modern Physics | Year: 2010

In this Colloquium the theory of silicon nanowires is reviewed. Nanowires with diameters below 10 nm are the focus, where quantum effects become important and the properties diverge significantly from those of bulk silicon. These wires can be treated within electronic structure simulation methods and will be among the most important functional blocks of future nanoelectronic devices. First, the structural properties of silicon nanowires are reviewed, emphasizing the close connection between the growth orientation, the cross section, and the bounding facets. Second, the electronic structure of pristine and doped nanowires is discussed, which holds the ultimate key for their applicability in novel electronic devices. Finally, transport properties are reviewed where some important limitations in the performances of nanowire-based devices can lay. Many unique properties of these systems are at the same time defying challenges and opportunities for technological advances. © 2010 The American Physical Society. Source


Grushin A.G.,CSIC - Institute of Materials Science
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

In Lorentz violating quantum electrodynamics (QED) it is known that a radiatively induced Chern-Simons term appears in the effective action for the gauge field, which is finite but undetermined. This ambiguity is shown to be absent in a condensed matter realization of such a theory in Weyl semi-metals due to the existence of a full microscopic model from which this effective theory emerges. Physically observable consequences such as birefringence are also discussed in this scenario. © 2012 American Physical Society. Source


Nieto-Vesperinas M.,CSIC - Institute of Materials Science
Optics Letters | Year: 2015

We establish the equations for the time-averaged optical torque on dipolar bi-isotropic particles. Due to the interference of the scattered fields, it has a term additional to the one that is commonly employed in theory and experiments. Its consequences for conservation of energy, angular momentum, and effects like negative torques are discussed. © 2015 Optical Society of America. Source


Garcia R.,CSIC - Institute of Materials Science | Knoll A.W.,IBM | Riedo E.,Georgia Institute of Technology
Nature Nanotechnology | Year: 2014

The nanoscale control afforded by scanning probe microscopes has prompted the development of a wide variety of scanning-probe-based patterning methods. Some of these methods have demonstrated a high degree of robustness and patterning capabilities that are unmatched by other lithographic techniques. However, the limited throughput of scanning probe lithography has prevented its exploitation in technological applications. Here, we review the fundamentals of scanning probe lithography and its use in materials science and nanotechnology. We focus on robust methods, such as those based on thermal effects, chemical reactions and voltage-induced processes, that demonstrate a potential for applications. © 2014 Macmillan Publishers Limited. Source

Discover hidden collaborations