## Dr. Óscar Nájera

### Tribe29 GmbH

“You’re here because you know something. What you know you can’t explain, but you feel it. You’ve felt it your entire life, that there’s something wrong with the world.”

Morpheus, The Matrix

I’m a simple and tremendously curious person. I studied Physics just for fun. I really enjoy learning about the only universe I’ll ever life on. I was most interested in Solid State Physics and Statistical Mechanics, which led me into a PhD in Strongly Correlated Electrons.

I learned programming quite early in my life and I since then I’m always around computers. I integrated them to my research work by developing computer simulations. I currently work at a software company to develop high performance tools to monitoring IT infrastructure.

I have learned everything about computers online, and learning requires seeing how things are done. Free Software encompasses this philosophy very nicely. You share your work for others to learn about it and even better build upon it.

When I get a chance I got out to dance. I like West Coast Swing the most, and you can also find me dancing Salsa, Bachata and even Ballroom. Dancing is the most amazing recreation Art and Sport I have ever practiced. It is giving motion to emotion.

### Interests

• Free/Libre and Open Source Software (FLOSS)
• Emergent Phenomena
• Statistical Physics
• Automation
• Computational Systems analysis

### Education

• PhD in Strongly Correlated Electron Systems, 2017

Université Paris-Saclay (Paris-Sud)

• Master in Molecular Nano- bio-photonics (MONABIPHOT), 2014

École Normale Supérieure de Cachan

• Diploma Physics, 2012

Escuela Politécnica Nacional

# Contact

The simplest way of communication is by email. You can communicate securely with me using GnuPG (If you don’t know about it, it is a good time to learn). My key-ID has the fingerprint

7D28 EBAE F208 A715 363D 3C7A BF54 14CD C5E4 73B3

# Experience

#### Tribe29 GmbH

September 2018 – Present Munich, Germany
Working with a high growth open-source software firm focused on Infrastructure and Application Monitoring for any environment.

#### Université Paris Saclay (Paris-Sud)

September 2014 – December 2017 Orsay, France
Dissertation
Study of the dimer Hubbard Model within Dynamical Mean Field Theory and its application to VO$$_2$$

Develop Many Body Physics simulations using Quantum Monte Carlo Algorithms. I implemented in Python, and C++ the necessary algorithms for the simulations, data collection and data analysis. I supported the infrastructure where my software had to run. Managing the High Performance computing cluster, having Continuous Integration Services setup using cloud services to insure code quality. Implemented as a side project Sphinx-Gallery which currently powers the scientific Python documentation websites.

Theory Group at Laboratoire de Physique des Solides

# Publications

### Capacity Management based on Monitoring data

This article is in German. In checkmk 1.6 I implemented the possibility to calculate forecasts over monitored IT-resources in order to predict future utilization. This feature was developed to allow on-premise service providers to independently evaluate their resource utilization and plan their resource allocation.

### Imaging the nanoscale phase separation in vanadium dioxide thin films at terahertz frequencies

Abstract Vanadium dioxide (VO$$_2$$) is a material that undergoes an insulator–metal transition upon heating above 340 K. It remains debated as to whether this electronic transition is driven by a corresponding structural transition or by strong electron–electron correlations.

### Multiple crossovers and coherent states in a Mott-Peierls insulator

Abstract We consider the dimer Hubbard model within dynamical mean-field theory to study the interplay and competition between Mott and Peierls physics. We describe the various metal-insulator transition lines of the phase diagram and the breakdown of the different solutions that occur along them.

### Study of the dimer Hubbard Model within Dynamical Mean Field Theory and its application to VO$_2$

Abstract We study in detail the solution of a basic strongly correlated model,namely, the dimer Hubbard model. This model is the simplest realization ofa cluster DMFT problem.We provide a detailed description of the solutions in the “coexistent region” where two (meta)stable states of the DMFT equations are found, onea metal and the other an insulator.

### Resolving the VO$_2$ controversy: Mott mechanism dominates the insulator-to-metal transition

Abstract We consider a minimal model to investigate the metal-insulator transition in VO$$_2$$. We adopt a Hubbard model with two orbitals per unit cell, which captures the competition between Mott and singlet-dimer localization.

# Education

#### Université Paris Saclay (Paris-Sud)

September 2014 – December 2017 Orsay, France
Dissertation
Study of the dimer Hubbard Model within Dynamical Mean Field Theory and its application to VO$$_2$$

#### École Normale Supérieure de Cachan

September 2013 – August 2014 Cachan, France
Mémoire
Study of spin-orbit effects in the Mott-Hubbard metal-insulator transition

#### Escuela Politécnica Nacional

October 2006 – August 2012 Quito, Ecuador
Diploma Thesis
Estimation, by computer simulation, of the exchange energy dispersion between polar nano-regions in $$Pb_xBi_4Ti_{3+x}O_{12+3x}; x=\{2,3\}$$ relaxor ferroelectrics

#### Colegio Aleman Quito

October 1997 – June 2006 Quito, Ecuador
• German Abitur May 2006
• Ecuadorian High School Diploma June 2005