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Riccardo Reho
Theoretical physicist in Materials Science

CONTACTS

r.reho@uu.nl

rreho

Riccardo Reho

ORCID

Google Scholar

Education

PhD Candidate: Utrecht University, 2020-2025

Master Degree Theoretical Physics: Università di Bologna, 2017-2020

Bachelor Physics: Università di Bologna, 2014-2017

Skills

Fortran, Python, GitHub, VS Code

Quantum Espresso, Aiida, Yambo, SIESTA

QElogo yambologo yambopylogo siestalogo

Languages

English

Italian

Spanish (Beginner)

News

QuREX-Book will be available soon. Have a look for some tips and tricks about DFT+MBPT+Wannier Thery and best usage of Yambo, Yambopy.

Theoretical Spectroscopy

The field of theoretical spectroscopy studies the interactions between light, matter, and Coulomb forces within materials. Deep knowledge and good understading over these properties is essential for the advancement of technology and the innovation of new devices. This understading can be acquired through two main approaches:

  • Experimenal techniques: Avdanveced spectroscopy methods are used to investigate the material's response to light excitation and lattice vibrations
  • Theoretical approaches: These aim not only to describe but also to predict the collective behaviors of electrons, phonons (dislocation modes), and photons within a material.
My research is centered on the theoretical prediction and description of the optical properties of novel materials, particularly Transition Metal Dichalcogenides (TMDs). These materials exhibit fascinating properties when reduced to the atomic scale, entering the quantum regime. The underlying theory we use to predict their behavior is quantum mechanics.

In quantum mechanics, the motion of electrons and their interactions with light (or other fields) are encapsulated in the Hamiltonian operator. Solving the Schrödinger equation for a given Hamiltonian provides access to the energy levels of many-body systems. When light interacts with these materials, it polarizes them, creating collective modes of electron-hole bound particles known as excitons.

An exciton can be intuitively understood as a bound state formed from the attractive interaction between an electron excited from the valence band to the conduction band and the hole it leaves behind.

To conduct my research, I use open-source codes like YAMBO, which is based on many-body perturbation theory and the non-equilibrium Green's function theory (NEGF). This tool is essential for exploring and predicting the properties of 2D layered TMD materials [?][?][?]. By leveraging these theoretical methods and computational tools, my work contributes to the broader understanding of light-matter interactions, paving the way for new technological advancements and innovations in material science.

References