Biplab Sanyal
Charles University in Prague
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Publication
Featured researches published by Biplab Sanyal.
Journal of Physics D | 2010
S.H. M Jafri; Karel Carva; Erika Widenkvist; Tobias Blom; Biplab Sanyal; Jonas Fransson; Olle Eriksson; Ulf Jansson; Helena Grennberg; Olof Karis; Ronald A. Quinlan; Brian C. Holloway; Klaus Leifer
Transport measurements have revealed several exotic electronic properties of graphene. The possibility to influence the electronic structure and hence control the conductivity by adsorption or doping with adatoms is crucial in view of electronics applications. Here, we show that in contrast to expectation, the conductivity of graphene increases with increasing concentration of vacancy defects, by more than one order of magnitude. We obtain a pronounced enhancement of the conductivity after insertion of defects by both quantum mechanical transport calculations as well as experimental studies of carbon nano-sheets. Our finding is attributed to the defect induced mid-gap states, which create a region exhibiting metallic behaviour around the vacancy defects. The modification of the conductivity of graphene by the implementation of stable defects is crucial for the creation of electronic junctions in graphene-based electronics devices.
Physical Review B | 2013
Heike C. Herper; Matthias Bernien; Sumanta Bhandary; Christian F. Hermanns; Alex Krüger; Jorge Miguel Soriano; C. Weis; Carolin Schmitz-Antoniak; B. Krumme; D. Bovenschen; C. Tieg; Biplab Sanyal; E. Weschke; Constantin Czekelius; H. Wende; Olle Eriksson; W. Kuch
The structural and magnetic properties of Fe octaethylporphyrin molecules on Cu(001) have been investigated by means of density functional theory (DFT) methods and x-ray absorption spectroscopy. The molecules have been adsorbed on the bare metal surface and on an oxygen-covered surface, which shows a root 2 x 2 root 2R45 degrees reconstruction. In order to allow for a direct comparison between magnetic moments obtained from sum-rule analysis and DFT, we calculate the spin dipolar term 7T (theta), which is also important in view of the magnetic anisotropy of the molecule. The measured x-ray magnetic circular dichroism shows a strong dependence on the photon incidence angle, which we could relate to a huge value of 7T (theta), e. g., on Cu(001), 7T (theta) amounts to -2.07 mu(B) for normal incidence leading to a reduction of the effective spin moment (m(s) + 7T (theta)). Calculations have also been performed to study the influence of possible ligands such as Cl and O atoms on the magnetic properties of the molecule and the interaction between molecule and surface because the experimental spectra display a clear dependence on the ligand, which is used to stabilize the molecule in the gas phase. Both types of ligands weaken the hybridization between surface and porphyrin molecule and change the magnetic spin state of the molecule, but the changes in the x-ray absorption are clearly related to residual Cl ligands.
Physical Review Letters | 2009
Matthias Bernien; Jorge Miguel; C. Weis; Md. Ehesan Ali; J. Kurde; B. Krumme; Pooja M. Panchmatia; Biplab Sanyal; M. Piantek; P. Srivastava; K. Baberschke; Peter M. Oppeneer; Olle Eriksson; W. Kuch; H. Wende
Physical Review B | 2007
O. Wessely; M. I. Katsnelson; Anders Nilsson; Anton Nikitin; Hirohito Ogasawara; Michael Odelius; Biplab Sanyal; Olle Eriksson
APS | 2009
Diana Iusan; Mohammad Mukul Kabir; Oscar Grånäs; Olle Eriksson; Biplab Sanyal
Physical Review B | 2018
Heike C. Herper; Matthias Bernien; Sumanta Bhandary; Christian F. Hermanns; Alex Krüger; Jorge Miguel; C. Weis; Carolin Schmitz-Antoniak; B. Krumme; D. Bovenschen; C. Tieg; Biplab Sanyal; E. Weschke; Constantin Czekelius; W. Kuch; H. Wende; Olle Eriksson
Archive | 2018
Serkan Akansel; Ankit Kumar; Vijayaharan A. Venugopal; Rudra Banerjee; Carmine Autieri; Rimantas Brucas; Nilamani Behera; Mauricio Sortica; Daniel Primetzhofer; Swaraj Basu; Mark Gubbins; Biplab Sanyal; Peter Svedlindh
Archive | 2017
Hu Li; Soumyajyoti Haldar; Biplab Sanyal; Olle Eriksson; Samar Hajjar-Garreau; Laurent Simon; Klaus Leifer
Archive | 2016
Raghuveer Chimata; Jayita Ganguli; Satadeep Bhattacharjee; Tanusri Saha Dasgupta; Olle Eriksson; Indra Dasgupta; Biplab Sanyal
Archive | 2016
Iulia Emilia Brumboiu; Soumyajyoti Haldar; Johann Lüder; Olle Eriksson; Heike C. Herper; Barbara Brena; Biplab Sanyal