Prediction of Ground State Structures and Robust Weyl Fermionic States in MnRhP

Singh, Jaspreet and Behatha, Anuroopa and Kharabadze, Saba and Kolmogorov, A. N. and Vaitheeswaran, G. and Kanchana, V. (2022) Prediction of Ground State Structures and Robust Weyl Fermionic States in MnRhP. The Journal of Physical Chemistry C, 126 (40). pp. 17328-17337. ISSN 1932-7447

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Abstract

Topological metals are a new class of materials that feature Fermionic quasiparticles with the presence of non-trivial band crossings near the Fermi level. In this work, we focus on establishing crystal structure ground states and the corresponding topological properties of MnRhP. Under ambient pressure and low temperatures, we find that an orthorhombic oP12 polymorph is favored over the known hexagonal hP9 phase. Pressures above 15 GPa stabilize tetragonal (tP6′), hexagonal (hP9′), and orthorhombic (oP12′) phases with inverted population of metal sites. While oP12′ has the lowest enthalpy, we show that hP9′ is more consistent with the previous X-ray diffraction data collected at 60 GPa. Our analysis of hP9 and oP12 topological properties reveals the existence of nodal lines around the Δ-point that are gapped out when spin-orbit coupling effects are included and transform into Weyl nodes with opposite chirality near the Fermi level. The calculated large values of the anomalous Hall conductivity in hP9, oP12, and tP6′ and the Z2 topological invariant in the non-magnetic hP9′ can be used to verify the predicted non-trivial robust topological features of MnRhP under ambient and high pressures. © 2022 American Chemical Society.

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IITH Creators:

IITH Creators	ORCiD
Kanchana, V.	UNSPECIFIED

Item Type:

Article

Additional Information:

Authors J.S., A.B., and V.K. acknowledge IIT Hyderabad and CDAC for computational facilities. S.K. and A.N.K. acknowledge the Extreme Science and Engineering Discovery Environment computational resources (NSF award no. ACI-1548562, project no. TG-PHY190024). G.V. acknowledges the support from Institution of Eminence-University of Hyderabad through (UoH-IoE-RC3-21-046) for funding and CMSD, University of Hyderabad, for providing computational support. A.B. acknowledges DST-INSPIRE for fellowship. J.S. acknowledges CSIR for fellowship. V.K. acknowledges DST project with Grant number (CRG/2018/000220).

Uncontrolled Keywords:

Ambient pressures; Crystals structures; Fermionic quasiparticles; Ground-state structures; Low enthalpies; Lows-temperatures; Metal sites; Non-trivial; Topological properties; X-ray diffraction data

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

18 Oct 2022 04:43

Last Modified:

18 Oct 2022 04:43

URI:

http://raiithold.iith.ac.in/id/eprint/10991