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Dirac states in the noncentrosymmetric superconductor BiPd

Pramanik, Arindam ; Pandeya, Ram Prakash ; Vyalikh, Denis V. ; Generalov, Alexander LU ; Moras, Paolo ; Kundu, Asish K. ; Sheverdyaeva, Polina M. ; Carbone, Carlo ; Joshi, Bhanu and Thamizhavel, A. , et al. (2021) In Physical Review B 103(15).
Abstract

Quantum materials having Dirac fermions in conjunction with superconductivity is believed to be the candidate material to realize exotic physics as well as advanced technology. Angle-resolved photoemission spectroscopy (ARPES), a direct probe of the electronic structure, has been extensively used to study these materials. However, experiments often exhibit conflicting results on dimensionality and momentum of the Dirac fermions (e.g., Dirac states in BiPd, a novel noncentrosymmetric superconductor), which is crucial for the determination of the symmetry, time-reversal invariant momenta, and other emerging properties. Employing high-resolution ARPES at varied conditions, we demonstrated a methodology to identify the location of the Dirac... (More)

Quantum materials having Dirac fermions in conjunction with superconductivity is believed to be the candidate material to realize exotic physics as well as advanced technology. Angle-resolved photoemission spectroscopy (ARPES), a direct probe of the electronic structure, has been extensively used to study these materials. However, experiments often exhibit conflicting results on dimensionality and momentum of the Dirac fermions (e.g., Dirac states in BiPd, a novel noncentrosymmetric superconductor), which is crucial for the determination of the symmetry, time-reversal invariant momenta, and other emerging properties. Employing high-resolution ARPES at varied conditions, we demonstrated a methodology to identify the location of the Dirac node accurately and discover that the deviation from two dimensionality of the Dirac states in BiPd proposed earlier is not a material property. These results helped to reveal the topology of the anisotropy of the Dirac states accurately. We have constructed a model Hamiltonian considering higher-order spin-orbit terms and demonstrate that this model provides an excellent description of the observed anisotropy. Intriguing features of the Dirac states in a noncentrosymmetric superconductor revealed in this study are expected to have significant implications regarding the properties of topological superconductors.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
103
issue
15
article number
155401
publisher
American Physical Society
external identifiers
  • scopus:85104413509
ISSN
2469-9950
DOI
10.1103/PhysRevB.103.155401
language
English
LU publication?
yes
id
aca0aee6-10d0-404e-beb2-932f50dd0c45
date added to LUP
2021-05-03 17:50:32
date last changed
2022-04-27 01:51:51
@article{aca0aee6-10d0-404e-beb2-932f50dd0c45,
  abstract     = {{<p>Quantum materials having Dirac fermions in conjunction with superconductivity is believed to be the candidate material to realize exotic physics as well as advanced technology. Angle-resolved photoemission spectroscopy (ARPES), a direct probe of the electronic structure, has been extensively used to study these materials. However, experiments often exhibit conflicting results on dimensionality and momentum of the Dirac fermions (e.g., Dirac states in BiPd, a novel noncentrosymmetric superconductor), which is crucial for the determination of the symmetry, time-reversal invariant momenta, and other emerging properties. Employing high-resolution ARPES at varied conditions, we demonstrated a methodology to identify the location of the Dirac node accurately and discover that the deviation from two dimensionality of the Dirac states in BiPd proposed earlier is not a material property. These results helped to reveal the topology of the anisotropy of the Dirac states accurately. We have constructed a model Hamiltonian considering higher-order spin-orbit terms and demonstrate that this model provides an excellent description of the observed anisotropy. Intriguing features of the Dirac states in a noncentrosymmetric superconductor revealed in this study are expected to have significant implications regarding the properties of topological superconductors.</p>}},
  author       = {{Pramanik, Arindam and Pandeya, Ram Prakash and Vyalikh, Denis V. and Generalov, Alexander and Moras, Paolo and Kundu, Asish K. and Sheverdyaeva, Polina M. and Carbone, Carlo and Joshi, Bhanu and Thamizhavel, A. and Ramakrishnan, S. and Maiti, Kalobaran}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{15}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Dirac states in the noncentrosymmetric superconductor BiPd}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.103.155401}},
  doi          = {{10.1103/PhysRevB.103.155401}},
  volume       = {{103}},
  year         = {{2021}},
}