Topological semimetals host interesting new types of low-energy quasiparticles such as type-I and type-II Dirac and Weyl fermions. Type-III topological semimetals can emerge exactly at the border between type-I and II, characterized by a line-like Fermi surface and a flat energy dispersion near the topological band crossing. Here, we theoretically predict that 1T-HfTe2 and 1T-ZrTe2 transition metal dichalcogenides are type-I and type-II DSMs, respectively. By alloying the two materials, a new HfxZr1−xTe2 alloy with type-III Dirac cone emerges at x = 0.2, in combination with 1% in-plane compressive strain. By imaging the electronic energy bands with in situ angle-resolved photoemission spectroscopy of this random alloy with the desired composition, grown by molecular beam epitaxy on InAs(111) substrates, we provide experimental evidence that the tοp of type-III Dirac cone lies at—or very close to—the Fermi level.
Skip Nav Destination
Article navigation
21 February 2021
Research Article|
February 19 2021
Type-III Dirac fermions in HfxZr1−xTe2 topological semimetal candidate
Special Collection:
Topological Materials and Devices
Sotirios Fragkos
;
Sotirios Fragkos
a)
1
Institute of Nanoscience and Nanotechnology, National Center for Scientific Research ‘Demokritos’
, 15310 Athens, Greece
2
Department of Mechanical Engineering, University of West Attica
, 12241 Athens, Greece
a)Authors to whom correspondence should be addressed: s.fragkos@inn.demokritos.gr; s.fragkos@uniwa.gr; and a.dimoulas@inn.demokritos.gr
Search for other works by this author on:
Polychronis Tsipas
;
Polychronis Tsipas
1
Institute of Nanoscience and Nanotechnology, National Center for Scientific Research ‘Demokritos’
, 15310 Athens, Greece
Search for other works by this author on:
Evangelia Xenogiannopoulou
;
Evangelia Xenogiannopoulou
1
Institute of Nanoscience and Nanotechnology, National Center for Scientific Research ‘Demokritos’
, 15310 Athens, Greece
Search for other works by this author on:
Yerassimos Panayiotatos
;
Yerassimos Panayiotatos
2
Department of Mechanical Engineering, University of West Attica
, 12241 Athens, Greece
Search for other works by this author on:
Athanasios Dimoulas
Athanasios Dimoulas
a)
1
Institute of Nanoscience and Nanotechnology, National Center for Scientific Research ‘Demokritos’
, 15310 Athens, Greece
3
Department of Physics, National and Kapodistrian University of Athens
, 15772 Athens, Greece
a)Authors to whom correspondence should be addressed: s.fragkos@inn.demokritos.gr; s.fragkos@uniwa.gr; and a.dimoulas@inn.demokritos.gr
Search for other works by this author on:
a)Authors to whom correspondence should be addressed: s.fragkos@inn.demokritos.gr; s.fragkos@uniwa.gr; and a.dimoulas@inn.demokritos.gr
Note: This paper is part of the Special Topic on Topological Materials and Devices.
J. Appl. Phys. 129, 075104 (2021)
Article history
Received:
November 26 2020
Accepted:
February 04 2021
Citation
Sotirios Fragkos, Polychronis Tsipas, Evangelia Xenogiannopoulou, Yerassimos Panayiotatos, Athanasios Dimoulas; Type-III Dirac fermions in HfxZr1−xTe2 topological semimetal candidate. J. Appl. Phys. 21 February 2021; 129 (7): 075104. https://doi.org/10.1063/5.0038799
Download citation file:
Sign in
Don't already have an account? Register
Sign In
You could not be signed in. Please check your credentials and make sure you have an active account and try again.
Sign in via your Institution
Sign in via your InstitutionPay-Per-View Access
$40.00