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2. Few-layer antimonene electrical properties

Author

Ares, Pablo, Pakdel, Sahar, Palacio, Irene, Paz, Wendel S., Rassekh, Maedeh, Rodríguez-San Miguel, David, Aballe, Lucía, Foerster, Michael, Ruiz del Árbol, Nerea, Martín-Gago, José Ángel, Zamora, Félix, Gómez-Herrero, Julio, and Palacios, Juan José

Published
2021
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7. Electronic properties of single-layer CoO2/Au(111).

Author

Holt, Ann Julie U., Pakdel, Sahar, Rodríguez-Fernández, Jonathan, Zhang, Yu, Curcio, Davide, Sun, Zhaozong, Lacovig, Paolo, Yao, Yong-Xin, Lauritsen, Jeppe V, Lizzit, Silvano, Lanatŕ, Nicola, Hofmann, Philip, Bianchi, Marco, and Sanders, Charlotte E

Published
2021
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10. Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates.

Author

Pakdel, Sahar and Miri, MirFaez

Subjects
*FARADAY effect, *MAGNETOOPTICS, *CIRCULAR dichroism, *GOLD, *SILVER, *DIMERS, *NANOPARTICLES
Abstract

We study the magneto-optical response of noble metal nanoparticle clusters. We consider, the interaction between the light-induced dipoles of particles. In the presence of a magnetic field, the simplest achiral cluster, a dimer, exhibits circular dichroism (CD). The CD of a dimer depends on the directions of the magnetic field and the light wave vector. The CD of a populous cluster weakly depends on the magnetic field. Upon scattering from the cluster, an incident linearly polarized light with polarization azimuth φ becomes elliptically polarized. The polarization azimuth rotation and ellipticity angle variation are sinusoidal functions of φ. The anisotropy and the chirality of the cluster control the amplitude and offset of these sinusoidal functions. The Faraday rotation and Faraday ellipticity are also sinusoidal functions of φ. Near the surface plasmon frequency, Faraday rotation, and Faraday ellipticity increase. [ABSTRACT FROM AUTHOR]

Published
2012
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11. Van Hove Singularities: Observation of Electrically Tunable van Hove Singularities in Twisted Bilayer Graphene from NanoARPES (Adv. Mater. 31/2020).

Author

Jones, Alfred J. H., Muzzio, Ryan, Majchrzak, Paulina, Pakdel, Sahar, Curcio, Davide, Volckaert, Klara, Biswas, Deepnarayan, Gobbo, Jacob, Singh, Simranjeet, Robinson, Jeremy T., Watanabe, Kenji, Taniguchi, Takashi, Kim, Timur K., Cacho, Cephise, Lanata, Nicola, Miwa, Jill A., Hofmann, Philip, Katoch, Jyoti, and Ulstrup, Søren

Published
2020
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12. Quenching of Exciton Recombination in Strained Two-Dimensional Monochalcogenides.

Author

Esteve-Paredes, J. J., Pakdel, Sahar, and Palacios, J. J.

Subjects
*EXCITON theory, *BINDING energy, *QUANTUM numbers, *VALENCE bands, *ELECTRONS
Abstract

We predict that long-lived excitons with very large binding energies can also exist in a single or few layers of monochalcogenides such as GaSe. Our theoretical study shows that excitons confined by a radial local strain field are unable to recombine despite electrons and holes coexisting in space. The localized single-particle states are calculated in the envelope function approximation based on a three-band k·p Hamiltonian obtained from density-functional-theory calculations. The binding energy and the decay rate of the exciton ground state are computed after including correlations in the basis of electron-hole pairs. The interplay between the localized strain and the caldera-type valence band characteristic of few-layered monochalcogenides creates localized electron and hole states with very different quantum numbers which hinders the recombination even for singlet excitons. [ABSTRACT FROM AUTHOR]

Published
2019
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