Ballistic transport through graphene nanostructures of velocity and potential barriers
Само за регистроване кориснике
2011
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
We investigate the electronic properties of graphene nanostructures when the Fermi velocity and the electrostatic potential vary in space. First, we consider the transmission T and conductance G through single and double barriers. We show that G for velocity barriers differs markedly from that for potential barriers for energies below the height of the latter and it exhibits periodic oscillations as a function of the energy for strong velocity modulation. Special attention is given to superlattices (SLs). It is shown that an applied bias can efficiently widen or shrink the allowed minibands of velocity-modulated SLs. The spectrum in the Kronig-Penney limit is periodic in the strength of the barriers. Collimation of an electron beam incident on an SL with velocity and potential barriers is present but it disappears when the potential barriers are absent. The number of additional Dirac points may change considerably if barriers and wells have sufficiently different Fermi velocities.
Извор:
Journal of Physics-Condensed Matter, 2011, 23, 13Издавач:
- Iop Publishing Ltd, Bristol
Финансирање / пројекти:
- Canadian NSERC - OGP0121756
DOI: 10.1088/0953-8984/23/13/135302
ISSN: 0953-8984
PubMed: 21403236
WoS: 000288749300006
Scopus: 2-s2.0-79953646421
Институција/група
IHTMTY - JOUR AU - Krstajić, Predrag AU - Vasilopoulos, Panagiotis PY - 2011 UR - https://cer.ihtm.bg.ac.rs/handle/123456789/905 AB - We investigate the electronic properties of graphene nanostructures when the Fermi velocity and the electrostatic potential vary in space. First, we consider the transmission T and conductance G through single and double barriers. We show that G for velocity barriers differs markedly from that for potential barriers for energies below the height of the latter and it exhibits periodic oscillations as a function of the energy for strong velocity modulation. Special attention is given to superlattices (SLs). It is shown that an applied bias can efficiently widen or shrink the allowed minibands of velocity-modulated SLs. The spectrum in the Kronig-Penney limit is periodic in the strength of the barriers. Collimation of an electron beam incident on an SL with velocity and potential barriers is present but it disappears when the potential barriers are absent. The number of additional Dirac points may change considerably if barriers and wells have sufficiently different Fermi velocities. PB - Iop Publishing Ltd, Bristol T2 - Journal of Physics-Condensed Matter T1 - Ballistic transport through graphene nanostructures of velocity and potential barriers VL - 23 IS - 13 DO - 10.1088/0953-8984/23/13/135302 ER -
@article{ author = "Krstajić, Predrag and Vasilopoulos, Panagiotis", year = "2011", abstract = "We investigate the electronic properties of graphene nanostructures when the Fermi velocity and the electrostatic potential vary in space. First, we consider the transmission T and conductance G through single and double barriers. We show that G for velocity barriers differs markedly from that for potential barriers for energies below the height of the latter and it exhibits periodic oscillations as a function of the energy for strong velocity modulation. Special attention is given to superlattices (SLs). It is shown that an applied bias can efficiently widen or shrink the allowed minibands of velocity-modulated SLs. The spectrum in the Kronig-Penney limit is periodic in the strength of the barriers. Collimation of an electron beam incident on an SL with velocity and potential barriers is present but it disappears when the potential barriers are absent. The number of additional Dirac points may change considerably if barriers and wells have sufficiently different Fermi velocities.", publisher = "Iop Publishing Ltd, Bristol", journal = "Journal of Physics-Condensed Matter", title = "Ballistic transport through graphene nanostructures of velocity and potential barriers", volume = "23", number = "13", doi = "10.1088/0953-8984/23/13/135302" }
Krstajić, P.,& Vasilopoulos, P.. (2011). Ballistic transport through graphene nanostructures of velocity and potential barriers. in Journal of Physics-Condensed Matter Iop Publishing Ltd, Bristol., 23(13). https://doi.org/10.1088/0953-8984/23/13/135302
Krstajić P, Vasilopoulos P. Ballistic transport through graphene nanostructures of velocity and potential barriers. in Journal of Physics-Condensed Matter. 2011;23(13). doi:10.1088/0953-8984/23/13/135302 .
Krstajić, Predrag, Vasilopoulos, Panagiotis, "Ballistic transport through graphene nanostructures of velocity and potential barriers" in Journal of Physics-Condensed Matter, 23, no. 13 (2011), https://doi.org/10.1088/0953-8984/23/13/135302 . .