Disorder effects on the ballistic transport of gated phosphorene superlattices
Por:
Guzman, E. J., Oubram, O., Navarro, O., Rodriguez-Vargas, I
Publicada:
6 ene 2023
Resumen:
In this paper, we carry out a theoretical study of the electronic
ballistic transport in gated phosphorene super-lattices. Our work is
focused on the effects by the random introduction of structural disorder
in the electrostatic potential barriers. Specifically, we consider
various degrees of disorder in the width and height of the barriers. To
explain the transport of the charge carriers (electrons and holes) in
the armchair direction of phosphorene, we employ a low-energy two-band
Hamiltonian derived from the tight-binding model. The transmission and
conductance are calculated by the transfer matrix technique and the
Landauer-Buttiker formalism, respectively. We have found that both types
of disorder affect the transmission and conductance in different ways,
and we also found distinct effects on the charge carriers. In general,
the disorder significantly reduces the transmission as well as the peak
zones associated with the tunneling effect. Particularly, for disorder
in the width, the transmission miniband structure is greatly degraded,
while for disorder in the height, the miniband structure is preserved.
The variation in the width of the barriers interferes directly with the
Fabry-Perot resonances of the propagating waves, while the variation in
the height mainly reduces the magnitude of the transmission due to the
dominance of evanescent waves. Consequently, the conductance loses its
oscillatory characteristic and experiences flattening under the
influence of disorder of the width, in contrast with the disorder of the
height in which the oscillation prevails. Finally, we found that both
types of disorder induce a redistribution of electron states.
Specifically, the allowed energy bands are increased, and the occupation
number as well as the accumulation of states are greatly reduced, which
is in accordance with the effects of disorder observed in the transport
properties.
Filiaciones:
Guzman, E. J.:
Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma Del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos, 62209, Mexico
Univ Autonoma Estado Morelos, Fac Ciencias Quim & Ingn, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico
Oubram, O.:
Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma Del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Morelos, 62209, Mexico
Univ Autonoma Estado Morelos, Fac Ciencias Quim & Ingn, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico
Navarro, O.:
Unidad Morelia Del Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro No. 8701, Col. Ex Hacienda de San José de la Huerta, Michoacán, Morelia, 58190, Mexico
Univ Nacl Autonoma Mexico, Unidad Morelia Inst Invest Mat, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Rodriguez-Vargas, I:
Unidad Académica de Ciencia y Tecnología de la Luz y la Materia, Universidad Autónoma de Zacatecas, Circuito Marie Curie S/N, Parque de Ciencia y Tecnología QUANTUM Ciudad del Conocimiento, Zacatecas, C.P. 98160, Mexico
Univ Autonoma Zacatecas, Unidad Acad Ciencia & Tecnol Luz & Mat, Circuito Marie Curie S-N, Zacatecas 98160, Zacatecas, Mexico
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