The effect of pressure and spin orbit interaction on topological phase and phonon dispersion of LuX (X= Sb, Bi) compounds

Narimani, Mitra; Yalameha, Shahram; Nourbakhsh, Zahra

doi:10.1016/j.jallcom.2018.07.283

Cited by 9 publications

(3 citation statements)

References 23 publications

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“…Quasi-two-dimensionality of the electronic states, significant reduction of the Debye temperature from its bulk value, and accessibility to the two-dimensional limit of the phonon spectrum offers opportunities to control electron-phonon coupling in epitaxial thin films. Furthermore, recent DFT calculations predict the possibility of a topological phase transition in LuSb and LuBi on application of bi-axial strain [36], which should now be accessible to experimentalists. Our work lays the foundation for further studies of controlled tunability of the electronic properties via epitaxial strain, dimensional confinement and electrostatic gating in this technologically relevant material system for novel device applications.…”

Section: Discussionmentioning

confidence: 99%

Weak antilocalization in quasi-two-dimensional electronic states of epitaxial LuSb thin films

et al. 2019

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Observation of large nonsaturating magnetoresistance in rare-earth monopnictides has raised enormous interest in understanding the role of its electronic structure. Here, by a combination of molecular-beam epitaxy, low-temperature transport, angle-resolved photoemission spectroscopy, and hybrid density functional theory we have unveiled the band structure of LuSb, where electron-hole compensation is identified as a mechanism responsible for large magnetoresistance in this topologically trivial compound. In contrast to bulk single crystal analogues, quasi-two-dimensional behavior is observed in our thin films for both electron and holelike carriers, indicative of dimensional confinement of the electronic states. Introduction of defects through growth parameter tuning results in the appearance of quantum interference effects at low temperatures, which has allowed us to identify the dominant inelastic scattering processes and elucidate the role of spin-orbit coupling. Our findings open up possibilities of band structure engineering and control of transport properties in rare-earth monopnictides via epitaxial synthesis.

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Section: Discussionmentioning

confidence: 99%

Weak antilocalization in quasi-two-dimensional electronic states of epitaxial LuSb thin films

et al. 2019

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“…The monopnictides family with the important physical properties such as high superconductivity transition temperature (T c ) and high melting point and the other features are very appropriate for the technological applications [34]. Previously, the topological phase, structural, electronic, elastic and other salient properties of monopnictides have been investigated, expansively [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. These materials with the heavy elements, the strong SOI and the electronic correlation can be desirable topological candidates at zero pressure or under high pressures.…”

Section: Introductionmentioning

confidence: 99%

High thermoelectric efficiency of LaX (X = Sb, Bi) two dimensional topological insulators

Narimani

Yalameha

Nourbakhsh

2020

J. Phys.: Condens. Matter

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Topological insulators with novel surfaces or edge states are the topological nature sequel of bulk electronic wave functions of these materials. The observed signatures in the electronic structure of topological insulators can make them excellent candidates for thermoelectric materials. Low dimensional materials such as phosphorene and Bi 2 Te 3 nanowire have been confirmed to be desirable for the design of devices with high thermoelectric performance. So in this work, the phonon modes, formation energy and cohesive energy of LaX (X = Sb, Bi) monolayers are first calculated and investigated. Then the band order of these monolayers is investigated by the band structure calculations and the topological phase of these monolayers is proved by using the calculation of Z 2 topological invariant. The energy band gap and the band inversion strength of these monolayers are evaluated under in-plane strains. Also, the effect of different temperatures and in-plane strains on the thermoelectric performance of LaX monolayers is studied. The results show the high thermoelectric efficiency and d-p topological band inversion of these monolayers under compressive strains.

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“…Pavlosiuk et al verified that there was a clear band inversion with a tiny gap around the X point in the Brillouin zone (BZ), indicating that LuBi could be a topological semimetal [12]. However, Narimani et al pointed out that this compound was a topologically trivial metal with no band inversion and zero topological index (Z2 ~ 0), but a nontrivial one under P [28]. Thus, it follows that the topological nature of LuBi is full of controversy.…”

Section: Introductionmentioning

confidence: 99%

Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide

Tang

Ruan

et al. 2020

Phys. Rev. Materials

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Rare-earth monopnictides are predicted to be nontrivial semimetal candidates and show pressure-induced superconductivity. Here, we grow LuBi single crystal and study the magnetization, transport behaviors and electronic band structures to reveal its topological semimetal feature and superconductivity under pressure. At 0 GPa, the quantum oscillations indicate that there are several topologically nontrivial carrier pockets around the Fermi level, among which the hole ones are isotropic in shape, while the electron ones are anisotropic and responsible for the angular magnetoresistance.Upon compression, the superconductivity emerges in the titled compound, showing a similar pressure dependence as that observed in LaBi. Our calculation suggests that the electronic band structures are robust at low-and high-pressure respectively and thus the topological features are always preserved. Besides, the nearly pressure-independent density of state in LuBi indicates that the conventional electron-phonon coupling appears to play a minor role in the superconductivity.

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The effect of pressure and spin orbit interaction on topological phase and phonon dispersion of LuX (X= Sb, Bi) compounds

Cited by 9 publications

References 23 publications

Weak antilocalization in quasi-two-dimensional electronic states of epitaxial LuSb thin films

Weak antilocalization in quasi-two-dimensional electronic states of epitaxial LuSb thin films

High thermoelectric efficiency of LaX (X = Sb, Bi) two dimensional topological insulators

Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide

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