Zobrazeno 1 - 10
of 14
pro vyhledávání: '"F. J. Culchac"'
Publikováno v:
Nanoscale. 12:5014-5020
We present electronic structure calculations of twisted double bilayer graphene (TDBG): a tetralayer graphene structure composed of two AB-stacked graphene bilayers with a relative rotation angle between them. Using first-principles calculations, we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebbd92a689409040ada4250ce83db39f
https://doi.org/10.1039/c9nr10830k
https://doi.org/10.1039/c9nr10830k
Autor:
Felipe A. Pinheiro, Christian Farina, Rodrigo B. Capaz, Wilton J. M. Kort-Kamp, Felipe S. S. Rosa, F. J. Culchac
Publikováno v:
Physical Review B. 103
In this work we investigate the electromagnetic local density of states (LDOS) near a twisted bilayer graphene (TBG) deposited over a general isotropic substrate. The band structure of the TBG is calculated within a tight-binding framework, and then
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eafc3a2a55de40b904eeb133fd50d54c
https://doi.org/10.1103/physrevb.103.155423
https://doi.org/10.1103/physrevb.103.155423
The formation of a superstructure - with a related Moir\'e pattern - plays a crucial role in the extraordinary optical and electronic properties of twisted bilayer graphene, including the recently observed unconventional superconductivity. Here we pu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::936669a8b016cab95e1393c2a4d55af3
http://arxiv.org/abs/1811.00188
http://arxiv.org/abs/1811.00188
Publikováno v:
Physical Review B. 98
We study the electronic and optical properties of twisted trilayer and tetralayer graphene structures using a combination of tight-binding and density-functional theory methods. Band structures, densities of states, and optical absorption spectra are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7952008870ad3db02b2fe5ec0b9b08c7
https://doi.org/10.1103/physrevb.98.155135
https://doi.org/10.1103/physrevb.98.155135
Publikováno v:
Microelectronics Journal. 39:402-406
The energy spectrum of an electron in a two-dimensional concentric double quantum ring is exactly calculated in the presence of an axial magnetic field using linear combinations of confluent hypergeometric functions. The influence of the geometric co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a39a67daf3196172e9099af36bbd84e9
https://doi.org/10.1016/j.mejo.2007.07.063
https://doi.org/10.1016/j.mejo.2007.07.063
Publikováno v:
physica status solidi c. 4:4139-4144
We study the effect of geometric confinement on the electron states in a concentric double quantum ring. We calculate the energy of the electron ground state for both symmetric and asymmetric double quantum rings as a function of the radius of the in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e5ef4759675adc66be900c3104e8ab75
https://doi.org/10.1002/pssc.200675916
https://doi.org/10.1002/pssc.200675916
Autor:
Rodrigo B. Capaz, F. J. Culchac
Publikováno v:
Nanotechnology. 27:065707
The effects of edge magnetism on the Kohn anomaly (KA) of the G-band phonons of zigzag graphene nanoribbons (ZGNRs) are studied using a combination of the tight-binding and mean-field Hubbard models. We show that the opening of an energy gap, induced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65fca1386356c16fc3a7bbd64c6c96d0
https://doi.org/10.1088/0957-4484/27/6/065707
https://doi.org/10.1088/0957-4484/27/6/065707
Publikováno v:
Physical Review B. 86
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7afc9ecd4aa7505ad38793f3a23d8e00
https://doi.org/10.1103/physrevb.86.115407
https://doi.org/10.1103/physrevb.86.115407
Publikováno v:
Journal of Physics: Condensed Matter. 26:216002
Spin excitations in zigzag graphene nanoribbons are studied when the system is subjected to an electric field in the transversal direction. The magnetic properties and the lifetime of the spin excitations are systematically investigated and compared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12a953b604952311c583c3912b78e754
https://doi.org/10.1088/0953-8984/26/21/216002
https://doi.org/10.1088/0953-8984/26/21/216002
Publikováno v:
Culchac, F. J.; Latgé, A.; & Costa, A. T.(2011). Spin waves in zigzag graphene nanoribbons and the stability of edge ferromagnetism. New Journal of Physics, 13(3), 033028. doi: 10.1088/1367-2630/13/3/033028. UC Irvine: Retrieved from: http://www.escholarship.org/uc/item/2s09j9dk
We study the low energy spin excitations of zigzag graphene nanoribbons of varying width. We find their energy dispersion at small wave vector to be dominated by antiferromagnetic correlations between the ribbon's edges, in accrodance with previous c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3304e38dd696f9d09f3189b4e81e7c2e
https://doi.org/10.1088/1367-2630/13/3/033028
https://doi.org/10.1088/1367-2630/13/3/033028