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  4. Origin of large magnetoresistance in the topological nonsymmorphic semimetal TaSe3
 
research article

Origin of large magnetoresistance in the topological nonsymmorphic semimetal TaSe3

Gatti, G.  
•
Gosalbez-Martinez, D.  
•
Wu, Q. S.  
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October 13, 2021
Physical Review B

TaSe3 is a layered van der Waals semimetal with several inverted band gaps throughout the entire Brillouin zone and nontrivial Z(2) topological indices, which place it at the boundary between a strong and a weak topological phase. Our transport experiments reveal a quadratic nonsaturating magnetoresistance (MR) with values reaching 10(4)% at 1.8 K and 14 T, whose origins have to be searched in the material's band structure. Here we combine angle-resolved photoelectron spectroscopy experiments, also with spin resolution, with ab initio calculations based on density functional theory in order to draw a connection between the Fermi surface topology and the measured transport properties. Simulations based on the calculated Fermi surface clarify that electron-hole compensation plays an important role for the observed MR in the bulk material. At the surface, the position of Fermi level differs, and it can be controlled by alkali metal deposition which accounts not only for the energy shift of the bands but it slightly modifies the dispersion of the valence and conduction bands. We propose that the observed band-gap renormalization might offer a route for engineering the topological phase in TaSe3, alternative to strain.

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Type
research article
DOI
10.1103/PhysRevB.104.155122
Web of Science ID

WOS:000707472100002

Author(s)
Gatti, G.  
Gosalbez-Martinez, D.  
Wu, Q. S.  
Hu, J.
Zhang, S. N.  
Autes, G.  
Puppin, M.  
Bugini, D.
Berger, H.  
Moreschini, L.
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Date Issued

2021-10-13

Published in
Physical Review B
Volume

104

Issue

15

Article Number

155122

Subjects

Materials Science, Multidisciplinary

•

Physics, Applied

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Physics, Condensed Matter

•

Materials Science

•

Physics

•

giant magnetoresistance

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band-gap

•

transition

•

transport

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crystals

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPMN  
C3MP  
LSE  
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Available on Infoscience
November 6, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/182913
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