Effects of disorder on the transport and thermoelectric properties of silicene superlattices
Por:
Oubram, O., Navarro, O., Guzman, E. J., Rodriguez-Vargas, I.
Publicada:
1 ene 2020
Resumen:
Unavoidable structural disorder associated with the variation of the widths of barriers and wells as well as the heights of barriers in superlattices of 2D materials can affect considerably electronic transport and related phenomena. In this work, we study the impact of structural disorder on the electronic transport and thermoelectric properties of gated silicene superlattices (GSSLs). A low-energy effective Hamiltonian has been used to describe electrons in silicene. The transfer matrix approach, the Landauer–Büttiker formalism and the Cutler–Mott formula have been implemented to obtain the transport and thermoelectric properties. In particular, the conductance, Seebeck coefficient and power factor are investigated in ordered and disordered GSSLs. The results show that disorder related to the width of barriers-wells is not equivalent to the one associated to the height of barriers. The former barely changes the transport and thermoelectric coefficients at low energy, while the latter greatly affects them in the whole energy range. We also assess the disorder associated to the on-site potential of silicene layers, finding that its influence is limited. So, our results indicate that in the design and fabrication of GSSLs a precise control of the height of the barriers is required in order to have and preserve good thermoelectric properties. © 2020 Elsevier B.V.
Filiaciones:
Oubram, O.:
Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma del Estado de Morelos, Av.Universidad 1001, Col. Chamilpa, 62209, Cuernavaca, Morelos, Mexico
Department of Physics, St. John's University, 8000 Utopia Pkwy, Jamaica, NY 11439-9000, United States
(Corresponding Author), Univ Autonoma Estado Morelos, Fac Ciencias Quim & Ingn, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico
(Corresponding Author), St Johns Univ, Dept Phys, 8000 Utopia Pkwy, Jamaica, NY 11439 USA
Univ Autonoma Estado Morelos, Fac Ciencias Quim & Ingn, Av Univ 1001, Cuernavaca 62209, Morelos, Mexico
St Johns Univ, Dept Phys, 8000 Utopia Pkwy, Jamaica, NY 11439 USA
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, 58190 Morelia, Michoacán, Mexico
Department of Physics, Concordia University, 7141 Sherbrooke Street West Montreal, Quebec, H4B1R6, Canada
Univ Nacl Autonoma Mexico, Unidad Morelia Inst Invest Mat, Antigua Carretera Patzcuaro 8701, Morelia 58190, Michoacan, Mexico
Concordia Univ, Dept Phys, 7141 Sherbrooke St, West Montreal, PQ H4B 1R6, Canada
Guzman, E. J.:
Unidad Académica de Ciencia y Tecnología de la Luz y la Materia, Universidad Autónoma de Zacatecas, Carretera Zacatecas-Guadalajara Km. 6, Ejido La Escondida, 98160 Zacatecas, Zac., Mexico
Univ Autonoma Zacatecas, Unidad Acad Ciencia & Tecnol Luz & Mat, Carretera Zacatecas Guadalajara Km 6, Zacatecas 98160, Zac, Mexico
Rodriguez-Vargas, I.:
Unidad Académica de Ciencia y Tecnología de la Luz y la Materia, Universidad Autónoma de Zacatecas, Carretera Zacatecas-Guadalajara Km. 6, Ejido La Escondida, 98160 Zacatecas, Zac., Mexico
(Corresponding Author), Univ Autonoma Zacatecas, Unidad Acad Ciencia & Tecnol Luz & Mat, Carretera Zacatecas Guadalajara Km 6, Zacatecas 98160, Zac, Mexico
Univ Autonoma Zacatecas, Unidad Acad Ciencia & Tecnol Luz & Mat, Carretera Zacatecas Guadalajara Km 6, Zacatecas 98160, Zac, Mexico
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