Search

Your search keyword '"Martínez, Miguel Angel"' showing total 649 results
Start Over Author "Martínez, Miguel Angel"
649 results on '"Martínez, Miguel Angel"'

18. Suppression of second-harmonic generation from linear bands in the topological multifold semimetal RhSi

Author

Lu, Baozhu, Sayyad, Sharareh, Sánchez-MartÍnez, Miguel Ángel, Manna, Kaustuv, Felser, Claudia, Grushin, Adolfo G., and Torchinsky, Darius H.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics
Abstract

Recent experiments in the topological Weyl semimetal TaAs have observed record-breaking second-harmonic generation, a non-linear optical response at $2\omega$ generated by an incoming light source at $\omega$. However, whether second-harmonic generation is enhanced in topological semimetals in general is a challenging open question because their band structure entangles the contributions arising from trivial bands and topological band crossings. In this work, we circumvent this problem by studying RhSi, a chiral topological semimetal with a simple band structure with topological multifold fermions close to the Fermi energy. We measure second-harmonic generation (SHG) in a wide frequency window, $\omega\in [0.27,1.5]$eV and, using first principle calculations, we establish that, due to their linear dispersion, the contribution of multifold fermions to SHG is subdominant as compared with other regions in the Brillouin zone. Our calculations suggest that parts of the bands where the dispersion is relatively flat contribute significantly to SHG. As a whole, our results suggest avenues to enhance SHG responses., Comment: 7+6 pages, 4+6 figures

Published
2021
Full Text
View/download PDF

23. Postscript

Author

Martínez Martínez, Miguel Angel, primary and Sánchez Hernández, Ana Luisa, additional

Published
2023
Full Text
View/download PDF

25. Introduction

Author

Sánchez Hernández, Ana Luisa, primary and Martínez Martínez, Miguel Angel, additional

Published
2023
Full Text
View/download PDF

27. Spectral and optical properties of Ag$_3$Au(Se$_2$,Te$_2$) and dark matter detection

Author

Sánchez-Martínez, Miguel-Ángel, Robredo, Iñigo, Bidauzarraga, Arkaitz, Bergara, Aitor, de Juan, Fernando, Grushin, Adolfo G., and Vergniory, Maia G.

Subjects
Condensed Matter - Materials Science, High Energy Physics - Phenomenology
Abstract

In this work we study the electronic structure of Ag${}_3$AuSe${}_2$ and Ag${}_3$AuTe${}_2$, two chiral insulators whose gap can be tuned through small changes in the lattice parameter by applying hydrostatic pressure or choosing different growth protocols. Based on first principles calculations we compute their band structure for different values of the lattice parameters and show that while Ag${}_3$AuSe${}_2$ retains its direct narrow gap at the $\Gamma$ point, Ag${}_3$AuTe${}_2$ can turn into a metal. Focusing on Ag${}_3$AuSe${}_2$ we derive a low energy model around $\Gamma$ using group theory, which we use to calculate the optical conductivity for different values of the lattice constant. We discuss our results in the context of detection of light dark matter particles, which have masses of the order of a $k$eV, and conclude that Ag${}_3$AuSe${}_2$ satisfies three important requirements for a suitable detector: small Fermi velocities, $m$eV band gap and low photon screening. Our work motivates the growth of high-quality and large samples of Ag${}_3$AuSe${}_2$ to be used as target materials in dark matter detectors., Comment: 13 pages, 4 figures, fixed typos, submitted version

Published
2019
Full Text
View/download PDF

28. Linear optical conductivity of chiral multifold fermions

Author

Sánchez-Martínez, Miguel-Ángel, de Juan, Fernando, and Grushin, Adolfo G.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Chiral multifold fermions are quasiparticles described by higher spin generalizations of the Weyl equation, and are realized as low energy excitations near symmetry protected band crossings in certain chiral crystals. In this work we calculate the linear optical conductivity of all chiral multifold fermions. We show that it is enhanced with respect to that of Weyl fermions with the same Fermi velocity, and features characteristic activation frequencies for each multifold fermion class, providing an experimental fingerprint to detect them. We calculate the conductivity for realistic chiral multifold semimetals by using lattice tight-binding Hamiltonians that match the effective models of multifold fermions at low energies, for space groups 199 and 198. The latter includes RhSi, for which we give quantitative predictions, and also CoSi and AlPt. Our predictions can be tested in absorption or penetration depth measurements, and are necessary to extract the recently proposed quantized photocurrents from experiments., Comment: 15 pages, 10 figures. Accepted version

Published
2019
Full Text
View/download PDF

37. System for Troubleshooting Welded Printed Circuit Boards with Through Hole Technology Using Convolutional Neural Networks and Classic Computer Vision Techniques

Author

Ramirez-Farfan, Alberto-Santiago, Quiroz-Martinez, Miguel-Angel, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Botto-Tobar, Miguel, editor, S. Gómez, Omar, editor, Rosero Miranda, Raul, editor, Díaz Cadena, Angela, editor, Montes León, Sergio, editor, and Luna-Encalada, Washington, editor

Published
2022
Full Text
View/download PDF

38. Machine Learning Algorithm Selection for a Clinical Decision Support System Based on a Multicriteria Method

Author

Landivar, Galo Enrique Valverde, Arambulo, Jonathan Andrés España, Martinez, Miguel Angel Quiroz, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
Full Text
View/download PDF

39. A Machine Learning Model Comparison and Selection Framework for Software Defect Prediction Using VIKOR

Author

Martinez, Miguel Ángel Quiroz, Tayupanda, Byron Alcívar Martínez, Paguay, Sulay Stephanie Camatón, Peñafiel, Luis Andy Briones, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
Full Text
View/download PDF

40. A Framework for Modeling Critical Success Factors in the Selection of Machine Learning Algorithms for Breast Cancer Recognition

Author

Martinez, Miguel Angel Quiroz, Marin, Eddy Raul Montenegro, Landivar, Galo Enrique Valverde, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
Full Text
View/download PDF

41. Benchmarking Neural Networks Activation Functions for Cancer Detection

Author

Martinez, Miguel Angel Quiroz, Vernaza, Josue Ricardo Borja, Moran, Daniel Humberto Plua, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
Full Text
View/download PDF

42. Methodology for the Development of Computer Applications with Augmented Reality in the Tourism Sector

Author

Rios, Monica Daniela Gomez, Villegas, Juan Javier Trujillo, Martinez, Miguel Angel Quiroz, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq, editor, and Taiar, Redha, editor

Published
2022
Full Text
View/download PDF

45. Chatbot for Technical Support, Analysis of Critical Success Factors Using Fuzzy Cognitive Maps

Author

Quiroz Martinez, Miguel Angel, Mayorga Plua, Segundo Estuardo, Gomez Rios, Monica Daniela, Leyva Vázquez, Maikel Yelandi, Plua Moran, Daniel Humberto, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Botto-Tobar, Miguel, editor, Montes León, Sergio, editor, Camacho, Oscar, editor, Chávez, Danilo, editor, Torres-Carrión, Pablo, editor, and Zambrano Vizuete, Marcelo, editor

Published
2021
Full Text
View/download PDF

47. Teaching Brooks Law Based on Fuzzy Cognitive Maps and Chatbots

Author

Martinez, Miguel Angel Quiroz, Ramírez, Andres Fabian Arteaga, Arias, Santiago Teodoro Castro, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq Z., editor, Karwowski, Waldemar, editor, and Kalra, Jay, editor

Published
2021
Full Text
View/download PDF

48. Knowledge Discovery About Cancer Based on Fuzzy Predicates

Author

Martinez, Miguel Angel Quiroz, Alava, Christian Rene Vargas, Rios, Monica Daniela Gomez, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ahram, Tareq Z., editor, Karwowski, Waldemar, editor, and Kalra, Jay, editor

Published
2021
Full Text
View/download PDF

49. Design of an IoT Architecture in Livestock Environments for the Treatment of Information for the Benefit of Cattle

Author

Martinez, Miguel Angel Quiroz, Zapata, David Manuel Rodriguez, Rios, Monica Daniela Gomez, Vazquez, Maikel Yelandi Leyva, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Ayaz, Hasan, editor, Asgher, Umer, editor, and Paletta, Lucas, editor

Published
2021
Full Text
View/download PDF

50. Architectural Design for the Implementation of Learning Analytics: Case Study at Salesian Polytechnic University

Author

Castro Arias, Santiago Teodoro, Quiroz Martinez, Miguel Angel, Leyva Vazquez, Maikel Yelandi, Flores Ortiz, Angela Cecilia, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Nazir, Salman, editor, Ahram, Tareq Z., editor, and Karwowski, Waldemar, editor

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results