Robustness of the electronic structure and charge transfer in topological insulator Bi₂Te₂Se and Bi₂Se₂Te thin films under an external electric field

Abstract

The electronic structure and charge transfer of Bi2Te2Se and Bi2Se2Te thin films are robust to an external electrical field.

Unraveling the Critical Role of Melt-Spinning Atmosphere in Enhancing the Thermoelectric Performance of p-Type Bi0.52Sb1.48Te3 Alloys

“…This is due to the fact that the valence band maximum is mainly made up of Te p-orbital, and Te deficiency results in opening up of band gap compared to pristine Te. 63 The Pisarenko plot (α ∼ p) is provided in Figure 4d, matching well with the theoretical curves with fixed effective masses in between 1.10 and 1.33 m 0 . The calculation details can be found in the Supporting Information.…”

“…The Ar and N 2 samples demonstrate nearly identical trends in PF with the highest value of ∼3.2 × 10 –3 W m –1 K –2 achieved at room temperature, comparable to the literature reports, , whereas the PF for He sample presents a similar increasing trend as its Seebeck coefficient. This is due to the fact that the valence band maximum is mainly made up of Te p-orbital, and Te deficiency results in opening up of band gap compared to pristine Te . The Pisarenko plot (α ∼ p ) is provided in Figure d, matching well with the theoretical curves with fixed effective masses in between 1.10 and 1.33 m 0 .…”

Two-Dimensional Janus Antimony Selenium Telluride with Large Rashba Spin Splitting and High Electron Mobility

“…It is known that in the case of a covalent bond, the lone-pair electrons are localized around the atoms and the electrons constituting the bonds are delocalized. Hence, the Sb–Se and Sb–Te atoms are bonded by forming covalent bonds, which is similar to the bonding nature of Bi 2 Te 2 Se and Bi 2 Se 2 Te …”

“…Hence, the Sb−Se and Sb−Te atoms are bonded by forming covalent bonds, which is similar to the bonding nature of Bi 2 Te 2 Se and Bi 2 Se 2 Te. 42 The phonon spectra of Sb 2 Se x Te 3−x are shown in Figure 2a,b, respectively. Clearly, there is no negative frequency in the spectra, which demonstrates the dynamical stability of these monolayers.…”

The Zintl phase compounds AEIn2As2 (AE = Ca, Sr, Ba): topological phase transition under pressure

“…The electronic structures of Bi 2 Te 2 Se and Bi 2 Se 2 Te films exhibit robustness to electric fields. 28 The topological phase transition was induced by applying hydrostatic pressure to MnBi 2 Te 4 by Pei et al 29 Mutch et al found the essential basis for the pressure-tuned ZrTe 5 topological phase transition. 30 Pressure-induced topological phase transition was also confirmed in the Dirac semimetal Cd 3 As 2 .…”