Speaker: Andrés Cantarero, Molecular Science Institute, University of Valencia.
Time: 10:00 am, Apr.22th.
Location: SIST 1A-200
Host: Prof. Xufeng Kou
Abstract:
Magnetic two-dimensional (2D) materials offer a promising platform for the miniaturization of nonreciprocal photonic components, potentially enabling compact, on-chip unidirectional light transport. However, the successful incorporation of these materials into photonic devices hinges on the accurate determination of their optical properties. We will start this talk discussing the interest in CrI3, a magnetic semiconductor with a layer structure, and the behavior of a few layers material. We have recently studied the optical properties of CrI3 as a function of the number of layers, observing two main transitions in the visible region. The transition energies change with the number of layers revealing three different regimes: nanoscopic, mesoscopic and bulk. We will explore the physics underlying these regimes using a phenomenological model and the crystal and electronic band structures obtained through density functional theory calculations. Additionally, we will discuss the relevance of other layered materials, such as BiI3 and NiBr2, and present some preliminary results.
Bio:
After completing my degree in Theoretical Physics at the University of Valencia, I pursued a master’s on the photomagnetoelectric effect in InSe, and my Ph. D. studying the crystal structure, transport and optical properties of Bi2S3, both layered materials. I then undertook a postdoctoral stay at the Max Planck Institute for Solid State Research in Stuttgart, Germany, where I worked on semiconductor nanostructures, investigating the effect of electric and magnetic fields, as well as pressure, on semiconductors and nanostructures. This work allowed me to combine my theoretical background with experimental techniques.
During that time, my focus was on the emission properties of nanostructures and Raman spectroscopy, particularly resonant Raman scattering. The collaboration with the Max Planck Institute spanned the entire decade of the 1990s.
Subsequently, I dedicated several years to the study of nitride semiconductor nanostructures, including quantum dots and quantum wires. More recently, my research was extended to the field of thermoelectricity, exploring both organic and inorganic materials. My solid theoretical foundation has been fundamental in interpreting experimental results, developing or applying existing phenomenological models and density functional theory.
In recent years I have renewed my interest in layered materials, particularly few layers systems, with a focus on their magnetic behavior, phonons, and magnons. Currently, I am a Full Professor on Condensed Matter Physics at the University of Valencia, I have published around 400 pear reviewed papers, participated in a similar number of international conferences, and have organized numerous Workshops and Conferences, primarily on semiconductor physics.
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