24-26 September 2020
Lima, Perú
America/Lima timezone
Share our event through the following link: https://indico.uni.edu.pe/e/Meeting-of-Physics-2020

Relativistic effects in HgTe and CdTe electronic structures

26 Sep 2020, 10:10
Lima, Perú

Lima, Perú

Centro de Investigación de la Facultad de Ciencias Universidad Nacional de Ingeniería
poster Materials Science and Nanotechnology Poster session


Mr Cristhian David Hinostroza Vargas Machuca (Universidad Nacional Mayor de San Marcos)


Quantum spin Hall phase, or also referred as Topological Insulator state, has been obtained in 2007 in a CdTe/HgTe quantum well [1]. These novel state is possible due to the inverted band order near the Fermi energy. These behaviour is originated because there exist a non negligible correlation between valence electrons of the 5d- and 6s-orbital of Hg [2], and relativistic effects [3], specifically spin-orbit coupling [4].

In this wotk, we present the electronic structure of Cadmiun Telluride (CdTe) and Mercury Teluride (HgTe), obtained using the local spin density approximation, including the Hubbard correction (LSDA+U), in the density functional theory (DFT), considering non relativistic, relativistic, and relativistic with spin-orbit coupling effects for each alloy. The results show that relativistic effects reduce the band gap for materials alloys, and inverted band ordering for HgTe is only possibe if spin-orbit copupling is considered.


[1] König, Markus, et al. "Quantum spin Hall insulator state in HgTe quantum wells." Science 318.5851 (2007): 766-770..
[2] Hotta, Takashi. "Orbital ordering phenomena in d-and f-electron systems." Reports on Progress in Physics 69.7 (2006): 2061.
[3] Singh, Prabhakar P. "Relativistic effects in mercury: Atom, clusters, and bulk." Physical Review B 49.7 (1994): 4954.
[4] Al-Rajoub, S., and B. Hamad. "Theoretical investigations of the structural, electronic and optical properties of $Hg_{1-x}Cd_{x}Te$ alloys." Philosophical Magazine 95.22 (2015): 2466-2481.

Primary author

Mr Cristhian David Hinostroza Vargas Machuca (Universidad Nacional Mayor de San Marcos)


Dr Pablo Hector Rivera Riofano (Universidad Nacional Mayor de San Marcos)

Presentation Materials

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