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Strong spin-orbit coupling in the noncentrosymmetric Kondo lattice

Generalov, A. LU ; Falke, J. ; Nechaev, I. A. ; Otrokov, M. M. ; Güttler, M. ; Chikina, A. ; Kliemt, K. ; Seiro, S. ; Kummer, K. and Danzenbächer, S. , et al. (2018) In Physical Review B 98(11).
Abstract

Strong spin-orbit coupling (SOC) in combination with a lack of inversion symmetry and exchange magnetic interaction proves to be a sophisticated instrument allowing efficient control of the spin orientation, energy and trajectories of two-dimensional (2D) electrons and holes trapped at surfaces or interfaces. Exploiting Kondo-related phenomena and crystal-electric-field effects at reduced dimensionalities opens new opportunities to handle their spin-dependent properties offering novel functionalities. We consider here a 2D Kondo lattice represented by a Si-Ir-Si-Yb (SISY) surface block of the heavy-fermion material YbIr2Si2. We show that the Kondo interaction with 4f moments allows finely tuning the group velocities of the strongly... (More)

Strong spin-orbit coupling (SOC) in combination with a lack of inversion symmetry and exchange magnetic interaction proves to be a sophisticated instrument allowing efficient control of the spin orientation, energy and trajectories of two-dimensional (2D) electrons and holes trapped at surfaces or interfaces. Exploiting Kondo-related phenomena and crystal-electric-field effects at reduced dimensionalities opens new opportunities to handle their spin-dependent properties offering novel functionalities. We consider here a 2D Kondo lattice represented by a Si-Ir-Si-Yb (SISY) surface block of the heavy-fermion material YbIr2Si2. We show that the Kondo interaction with 4f moments allows finely tuning the group velocities of the strongly spin-polarized carriers in 2D itinerant states of this noncentrosymmetric system. To unveil the peculiarities of this interaction, we used angle-resolved photoemission measurements complemented by first-principles calculations. We established that the strong SOC of the Ir atoms induces spin polarization of the 2D states in SISY block, while the 2D lattice of Yb 4f moments acts as a source for coherent f-d interplay. The strong SOC and lack of inversion symmetry turn out to lead not only to the anticipated Rashba-like splitting of the 2D states, but also to spin splitting of the 4f Kramers doublets. They couple temperature-dependently to the spin-polarized 2D states and thereby guide the properties of the latter.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
98
issue
11
article number
115157
publisher
American Physical Society
external identifiers
  • scopus:85054159002
ISSN
2469-9950
DOI
10.1103/PhysRevB.98.115157
language
English
LU publication?
yes
id
edb3c31f-ce30-4a93-b966-940596b0d18c
date added to LUP
2018-10-10 14:40:38
date last changed
2022-04-25 17:59:03
@article{edb3c31f-ce30-4a93-b966-940596b0d18c,
  abstract     = {{<p>Strong spin-orbit coupling (SOC) in combination with a lack of inversion symmetry and exchange magnetic interaction proves to be a sophisticated instrument allowing efficient control of the spin orientation, energy and trajectories of two-dimensional (2D) electrons and holes trapped at surfaces or interfaces. Exploiting Kondo-related phenomena and crystal-electric-field effects at reduced dimensionalities opens new opportunities to handle their spin-dependent properties offering novel functionalities. We consider here a 2D Kondo lattice represented by a Si-Ir-Si-Yb (SISY) surface block of the heavy-fermion material YbIr2Si2. We show that the Kondo interaction with 4f moments allows finely tuning the group velocities of the strongly spin-polarized carriers in 2D itinerant states of this noncentrosymmetric system. To unveil the peculiarities of this interaction, we used angle-resolved photoemission measurements complemented by first-principles calculations. We established that the strong SOC of the Ir atoms induces spin polarization of the 2D states in SISY block, while the 2D lattice of Yb 4f moments acts as a source for coherent f-d interplay. The strong SOC and lack of inversion symmetry turn out to lead not only to the anticipated Rashba-like splitting of the 2D states, but also to spin splitting of the 4f Kramers doublets. They couple temperature-dependently to the spin-polarized 2D states and thereby guide the properties of the latter.</p>}},
  author       = {{Generalov, A. and Falke, J. and Nechaev, I. A. and Otrokov, M. M. and Güttler, M. and Chikina, A. and Kliemt, K. and Seiro, S. and Kummer, K. and Danzenbächer, S. and Usachov, D. and Kim, T. K. and Dudin, P. and Chulkov, E. V. and Laubschat, C. and Geibel, C. and Krellner, C. and Vyalikh, D. V.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{11}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Strong spin-orbit coupling in the noncentrosymmetric Kondo lattice}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.98.115157}},
  doi          = {{10.1103/PhysRevB.98.115157}},
  volume       = {{98}},
  year         = {{2018}},
}