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Title: Topological Semimetal features in the Multiferroic Hexagonal Manganites

Journal Article · · Physical Review Materials
 [1];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Inst. at Berkeley, Berkeley, CA (United States)

Using first-principles calculations we investigate the band structures of ferromagnetic hexagonal manganites $$\mathrm{YXO_3}$$ (X=V, Cr, Mn, Fe and Co) in the nonpolar nonsymmorphic $$P6_3/mmc$$ space group. For $$\mathrm{YVO_3}$$ and $$\mathrm{YCrO_3}$$ we find a band inversion near the Fermi energy that generates a nodal ring in the $$k_z=0$$ mirror plane. We perform a more detailed analysis for these compounds and predict the existence of the topological "drumhead" surface states. Finally, we briefly discuss the low-symmetry polar phases (space group $$P6_3cm$$) of these systems, and show they can undergo a $$P6_3/mmc \rightarrow P6_3cm$$ transition by condensation of soft $$K_3$$ and $$\Gamma_2^-$$ phonons. Based on our results, stabilizing these compnds in the hexagonal phase could offer a promising platform for studying the interplay of topology and multiferroicity, and the coexistence of real-space and reciprocal-space topological protection in the same phase.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Novel Pathways to Quantum Coherence in Materials (NPQC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1505530
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 3; ISSN 2475-9953
Country of Publication:
United States
Language:
English

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