1.
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10 p, 5.6 MB |
Experimental Demonstration of a Magnetically Induced Warping Transition in a Topological Insulator Mediated by Rare-Earth Surface Dopants
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Muñiz Cano, Beatriz (IMDEA Nanociencia) ;
Ferreiros, Yago (IMDEA Nanociencia) ;
Pantaleón, Pierre A. (IMDEA Nanociencia) ;
Dai, Ji (ALBA Laboratori de Llum de Sincrotró) ;
Tallarida, Massimo (ALBA Laboratori de Llum de Sincrotró) ;
Figueroa García, Adriana Isabel (Institut Català de Nanociència i Nanotecnologia) ;
Marinova, Vera (Institute of Optical Materials and Technologies Acad. G. Bontchev) ;
García-Díez, Kevin (Institut Català de Nanociència i Nanotecnologia) ;
Mugarza, Aitor (Institut Català de Nanociència i Nanotecnologia) ;
Valenzuela, Sergio O. (Institut Català de Nanociència i Nanotecnologia) ;
Miranda, Rodolfo (Universidad Autónoma de Madrid) ;
Camarero, Julio (Universidad Autónoma de Madrid. Departamento de Física de la Materia Condensada) ;
Guinea, Francisco (IMDEA Nanociencia) ;
Silva-Guillén, Jose Angel (IMDEA Nanociencia) ;
Valbuena, Miguel Ángel (IMDEA Nanociencia)
Magnetic topological insulators constitute a novel class of materials whose topological surface states (TSSs) coexist with long-range ferromagnetic order, eventually breaking time-reversal symmetry. The subsequent bandgap opening is predicted to co-occur with a distortion of the TSS warped shape from hexagonal to trigonal. [...]
2023 - 10.1021/acs.nanolett.3c00587
Nano letters, Vol. 23, Issue 13 (July 2023) , p. 6249-6258
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2.
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18 p, 4.7 MB |
Quasiparticle spectra of 2H-NbSe2 : two-band superconductivity and the role of tunneling selectivity
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Noat, Y. (Institut des Nanosciences de Paris) ;
Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
Cren, T. (Institut des Nanosciences de Paris) ;
Cherkez, V. (Institut des Nanosciences de Paris) ;
Brun, C. (Institut des Nanosciences de Paris) ;
Pons, S. (Institut des Nanosciences de Paris) ;
Debontridder, F. (Institut des Nanosciences de Paris) ;
Roditchev, D. (Institut des Nanosciences de Paris) ;
Sacks, W. (Université Paris 6) ;
Cario, L. (Institut des Matériaux Jean Rouxel) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ;
Garcia, Alberto (Institut de Ciència de Materials de Barcelona) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona)
We have studied the superconducting state of 2H-NbSe2 by scanning tunneling spectroscopy along two different crystal orientations, the c and the a/b axes. Along the c axis a large gap is dominant in the spectra, while a smaller gap is measured along the a/b axis. [...]
2015 - 10.1103/PhysRevB.92.134510
Physical review B : Condensed matter and materials physics, Vol. 92, Issue 13 (October 2015) , art. 134510
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3.
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8 p, 1.5 MB |
Tunneling and electronic structure of the two-gap superconductor MgB2
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Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
Noat, Y. (Institut des Nanosciences de Paris) ;
Cren, T. (Institut des Nanosciences de Paris) ;
Sacks, W. (Institut des Nanosciences de Paris) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia)
A combined experimental (superconductor-insulator-superconductor tunneling spectra) and theoretical (density functional theory) study of the two-gap superconductor MgB2 is reported. The calculations confirm that the small gap is associated with a π band mostly based on the boron pz orbitals leading to the three-dimensional band component of the Fermi surface. [...]
2015 - 10.1103/PhysRevB.92.064514
Physical review B : Condensed matter and materials physics, Vol. 92, Issue 6 (August 2015) , art. 64514
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4.
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5.
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16 p, 836.4 KB |
Coexistence of elastic modulations in the charge density wave state of 2H-NbSe₂
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Guster, Bogdan (Institut Català de Nanociència i Nanotecnologia) ;
Rubio Verdú, Carmen (CIC NanoGUNE700) ;
Robles, Roberto (Institut Català de Nanociència i Nanotecnologia) ;
Zaldívar, Javier (CIC NanoGUNE) ;
Dreher, Paul (Donostia International Physics Center) ;
Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia) ;
Silva-Guillén, Jose Angel (Wuhan University. School of Physics and Technology) ;
Choi, Deung-Jang (Donostia International Physics Center) ;
Pascual, José I. (CIC NanoGUNE) ;
Ugeda, Miguel M. (CIC NanoGUNE) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona)
Bulk and single-layer 2H-NbSe₂ exhibit identical charge density wave order (CDW) with a quasi-commensurate 3 × 3 superlattice periodicity. Here we combine scanning tunnelling microscopy (STM) imaging at T = 1 K of 2H-NbSe₂ with first-principles density functional theory (DFT) calculations to investigate the structural atomic rearrangement of this CDW phase. [...]
2019 - 10.1021/acs.nanolett.9b00268
Nano letters, Vol. 19, issue 5 (May 2019) , p. 3027-3032
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6.
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10 p, 331.0 KB |
Electronic properties of single-layer and multilayer transition metal dichalcogenides MX₂ (M = Mo, W and X = S, Se)
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Roldan, Rafael (Instituto de Ciencia de Materiales de Madrid) ;
Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
López-Sancho, M. Pilar (Instituto de Ciencia de Materiales de Madrid) ;
Guinea, Francisco (Instituto de Ciencia de Materiales de Madrid) ;
Cappelluti, Emmanuele (Consiglio Nazionale delle Ricerche. Istituto de Sistemi Complessi) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia)
Single- and few-layer transition metal dichalcogenides have recently emerged as a new family of layered crystals with great interest, not only from the fundamental point of view, but also because of their potential application in ultrathin devices. [...]
2014 - 10.1002/andp.201400128
Annalen der Physik, Vol. 526, issue 9-10 (Oct. 2014) , p. 347-357
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7.
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13 p, 2.2 MB |
Momentum dependence of spin-orbit interaction effects in single-layer and multi-layer transition metal dichalcogenides
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Roldan, Rafael (Instituto de Ciencia de Materiales de Madrid) ;
López Sancho, M. Pilar (Instituto de Ciencia de Materiales de Madrid) ;
Guinea, Francisco (Instituto de Ciencia de Materiales de Madrid) ;
Cappelluti, Emmanuele (Istituto de Sistemi Complessi) ;
Silva-Guillén, Jose Angel (Institut Català de Nanociència i Nanotecnologia) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia)
One of the main characteristics of the new family of two-dimensional crystals of semiconducting transition metal dichalcogenides (TMDs) is the strong spin-orbit interaction, which makes them very promising for future applications in spintronics and valleytronics devices. [...]
2014 - 10.1088/2053-1583/1/3/034003
2D Materials, Vol. 1, Núm. 3 (December 2014) , art. 34003
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8.
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11 p, 3.4 MB |
Electronic structure of 2H-NbSe₂ single-layers in the CDW state
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Silva-Guillén, Jose Angel (Fundación IMDEA Nanociencia) ;
Ordejon, Pablo (Institut Català de Nanociència i Nanotecnologia) ;
Guinea, Francisco (Fundación IMDEA Nanociencia) ;
Canadell Casanova, Enric 1950- (Institut de Ciència de Materials de Barcelona)
Adensity functional theory study of NbSe₂"Qsingle-layers in the normal non-modulated and the 3xQ3 CDW states is reported. Weshow that, in the single layer, the CDW barely affects the Fermi surface of the system, thus ruling out a nesting mechanism as the driving force for the modulation. [...]
2016 - 10.1088/2053-1583/3/3/035028
2D Materials, Vol. 3, no. 3 (Sep. 2016) , art. 35028
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