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Title: Nonsymmorphic cubic Dirac point and crossed nodal rings across the ferroelectric phase transition in LiOsO 3

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [4];  [5];  [6]
  1. National University of Singapore (Singapore)
  2. National University of Singapore (Singapore); National Center for Theoretical Science, Hsinchu (Taiwan); National Sun Yat-Sen University, Kaoshiung (Taiwan)
  3. National Sun Yat-Sen University, Kaoshiung (Taiwan)
  4. Singapore University of Technology and Design (Singapore)
  5. National University of Singapore (Singapore); Institute of Physics, Academia Sinica, Taipei (Taiwan)
  6. Northeastern University, Boston, MA (United States)

Crystalline symmetries can generate exotic band-crossing features, which can lead to unconventional fermionic excitations with interesting physical properties. We show how a cubic Dirac point—a fourfold-degenerate band-crossing point with cubic dispersion in a plane and a linear dispersion in the third direction—can be stabilized through the presence of a nonsymmorphic glide mirror symmetry in the space group of the crystal. Notably, the cubic Dirac point in our case appears on a threefold axis, even though it has been believed previously that such a point can only appear on a sixfold axis. We show that a cubic Dirac point involving a threefold axis can be realized close to the Fermi level in the nonferroelectric phase of LiOsO3. Upon lowering temperature, LiOsO3 has been shown experimentally to undergo a structural phase transition from the nonferroelectric phase to the ferroelectric phase with spontaneously broken inversion symmetry. Here we find that the broken symmetry transforms the cubic Dirac point into three mutually crossed nodal rings. There also exist several linear Dirac points in the low-energy band structure of LiOsO3, each of which is transformed into a single nodal ring across the phase transition.

Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Singapore National Research Foundation (NRF); National Center for Theoretical Sciences; Ministry of Science and Technology of Taiwan
Grant/Contract Number:
FG02-07ER46352; AC02-05CH11231; NRFF2013- 03; MOST-104-2112-M-110-002- MY3; MOE2015-T2-2-144
OSTI ID:
1541385
Alternate ID(s):
OSTI ID: 1437076
Journal Information:
Physical Review Materials, Vol. 2, Issue 5; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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