Energy gap of topological surface states in proximity to a magnetic insulator
Jiashu Wang
(1)
,
Tianyi Wang
(1)
,
Mykhaylo Ozerov
(2)
,
Zhan Zhang
(3)
,
Joaquin Bermejo-Ortiz
(4)
,
Seul-Ki Bac
(1)
,
Hoai Trinh
(1)
,
Maksym Zhukovskyi
(5)
,
Tatyana Orlova
(5)
,
Haile Ambaye
(6)
,
Jong Keum
(6)
,
L. A de Vaulchier
(4)
,
Yves Guldner
(4)
,
Dmitry Smirnov
(2)
,
Valeria Lauter
(6)
,
Xinyu Liu
(1)
,
Badih Assaf
(1)
Jiashu Wang
- Fonction : Auteur
- PersonId : 1279139
- ORCID : 0000-0003-0992-4560
Seul-Ki Bac
- Fonction : Auteur
- PersonId : 1279140
- ORCID : 0000-0002-8225-7218
Jong Keum
- Fonction : Auteur
- PersonId : 1279141
- ORCID : 0000-0002-5529-1373
L. A de Vaulchier
- Fonction : Auteur
- PersonId : 180623
- IdHAL : louis-annedevaulchier
- IdRef : 25312784X
Valeria Lauter
- Fonction : Auteur
- PersonId : 1279142
- ORCID : 0000-0003-0989-6563
Xinyu Liu
- Fonction : Auteur
- PersonId : 1279143
- ORCID : 0000-0002-7004-6878
Badih Assaf
- Fonction : Auteur
- PersonId : 1279144
- ORCID : 0000-0002-6879-9651
Résumé
Abstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb 1-x Sn x Se–EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level.
Format du dépôt | Notice |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Energy gap of topological surface states in proximity to a magnetic insulator
|
Résumé |
en
Abstract Topological surface-states can acquire an energy gap when time-reversal symmetry is broken by interfacing with a magnetic insulator. This gap has yet to be measured. Such topological-magnetic insulator heterostructures can host a quantized anomalous Hall effect and can allow the control of the magnetic state of the insulator in a spintronic device. In this work, we observe the energy gap of topological surface-states in proximity to a magnetic insulator using magnetooptical Landau level spectroscopy. We measure Pb 1-x Sn x Se–EuSe heterostructures grown by molecular beam epitaxy exhibiting a record mobility and low Fermi energy. Through temperature dependent measurements and theoretical calculations, we show this gap is likely due to quantum confinement and conclude that the magnetic proximity effect is weak in this system. This weakness is disadvantageous for the realization of the quantum anomalous Hall effect, but favorable for spintronic devices which require the preservation of spin-momentum locking at the Fermi level.
|
Auteur(s) |
Jiashu Wang
1
, Tianyi Wang
1
, Mykhaylo Ozerov
2
, Zhan Zhang
3
, Joaquin Bermejo-Ortiz
4
, Seul-Ki Bac
1
, Hoai Trinh
1
, Maksym Zhukovskyi
5
, Tatyana Orlova
5
, Haile Ambaye
6
, Jong Keum
6
, L. A de Vaulchier
4
, Yves Guldner
4
, Dmitry Smirnov
2
, Valeria Lauter
6
, Xinyu Liu
1
, Badih Assaf
1
1
Department of Physics [Notre Dame]
( 447521 )
- 225 Nieuwland Science Hall, Notre Dame, IN 46556
- États-Unis
2
FSU -
Florida State University [Tallahassee]
( 6406 )
- 600 W College Ave, Tallahassee, FL 32306
- États-Unis
3
ANL -
Argonne National Laboratory [Lemont]
( 49346 )
- 9700 S Cass Ave B109, Lemont, IL, 60439
- États-Unis
4
Nano-THz
( 1004934 )
- 24 rue Lhomond 75005 Paris
- France
5
UND -
University of Notre Dame [Indiana]
( 127379 )
- Notre Dame, Indiana 46556
- États-Unis
6
ORNL -
Oak Ridge National Laboratory [Oak Ridge]
( 28160 )
- 1 Bethel Valley Road -
Oak Ridge, TN 37830
- États-Unis
|
Langue du document |
Anglais
|
Licence |
Paternité
|
Nom de la revue |
|
Date de publication |
2023
|
Volume |
6
|
Numéro |
1
|
Page/Identifiant |
200
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Internationale
|
Date de publication électronique |
2023-05-08
|
URL éditeur |
https://www.nature.com/articles/s42005-023-01327-5
|
Domaine(s) |
|
Mots-clés |
en
Topological insulators
|
DOI | 10.1038/s42005-023-01327-5 |
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