Cotunneling signatures of spin-electric coupling in frustrated triangular molecular magnets
(2014) In Physical Review B (Condensed Matter and Materials Physics) 89(23).- Abstract
- The ground state of frustrated (antiferromagnetic) triangular molecular magnets is characterized by two total-spin S = 1/2 doublets with opposite chirality. According to a group theory analysis [M. Trif et al., Phys. Rev. Lett. 101, 217201 (2008)], an external electric field can efficiently couple these two chiral spin states, even when the spin-orbit interaction (SOI) is absent. The strength of this coupling, d, is determined by an off-diagonalmatrix element of the dipole operator, which can be calculated by ab initio methods [M. F. Islam et al., Phys. Rev. B 82, 155446 (2010)]. In this work, we propose that Coulomb-blockade transport experiments in the cotunneling regime can provide a direct way to determine the spin-electric coupling... (More)
- The ground state of frustrated (antiferromagnetic) triangular molecular magnets is characterized by two total-spin S = 1/2 doublets with opposite chirality. According to a group theory analysis [M. Trif et al., Phys. Rev. Lett. 101, 217201 (2008)], an external electric field can efficiently couple these two chiral spin states, even when the spin-orbit interaction (SOI) is absent. The strength of this coupling, d, is determined by an off-diagonalmatrix element of the dipole operator, which can be calculated by ab initio methods [M. F. Islam et al., Phys. Rev. B 82, 155446 (2010)]. In this work, we propose that Coulomb-blockade transport experiments in the cotunneling regime can provide a direct way to determine the spin-electric coupling strength. Indeed, an electric field generates a d-dependent splitting of the ground-state manifold, which can be detected in the inelastic cotunneling conductance. Our theoretical analysis is supported by master-equation calculations of quantum transport in the cotunneling regime. We employ a Hubbard-model approach to elucidate the relationship between the Hubbard parameters t and U, and the spin-electric coupling constant d. This allows us to predict the regime in which the coupling constant d can be extracted from experiment. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4595854
- author
- Nossa Márquez, Javier Francisco LU and Canali, C. M.
- organization
- publishing date
- 2014
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 89
- issue
- 23
- article number
- 235435
- publisher
- American Physical Society
- external identifiers
-
- wos:000339049700004
- scopus:84903732948
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.89.235435
- language
- English
- LU publication?
- yes
- id
- ef2edd6d-db98-4727-bc80-a0dfabf8554d (old id 4595854)
- date added to LUP
- 2016-04-01 14:25:55
- date last changed
- 2022-02-04 20:53:11
@article{ef2edd6d-db98-4727-bc80-a0dfabf8554d,
abstract = {{The ground state of frustrated (antiferromagnetic) triangular molecular magnets is characterized by two total-spin S = 1/2 doublets with opposite chirality. According to a group theory analysis [M. Trif et al., Phys. Rev. Lett. 101, 217201 (2008)], an external electric field can efficiently couple these two chiral spin states, even when the spin-orbit interaction (SOI) is absent. The strength of this coupling, d, is determined by an off-diagonalmatrix element of the dipole operator, which can be calculated by ab initio methods [M. F. Islam et al., Phys. Rev. B 82, 155446 (2010)]. In this work, we propose that Coulomb-blockade transport experiments in the cotunneling regime can provide a direct way to determine the spin-electric coupling strength. Indeed, an electric field generates a d-dependent splitting of the ground-state manifold, which can be detected in the inelastic cotunneling conductance. Our theoretical analysis is supported by master-equation calculations of quantum transport in the cotunneling regime. We employ a Hubbard-model approach to elucidate the relationship between the Hubbard parameters t and U, and the spin-electric coupling constant d. This allows us to predict the regime in which the coupling constant d can be extracted from experiment.}},
author = {{Nossa Márquez, Javier Francisco and Canali, C. M.}},
issn = {{1098-0121}},
language = {{eng}},
number = {{23}},
publisher = {{American Physical Society}},
series = {{Physical Review B (Condensed Matter and Materials Physics)}},
title = {{Cotunneling signatures of spin-electric coupling in frustrated triangular molecular magnets}},
url = {{http://dx.doi.org/10.1103/PhysRevB.89.235435}},
doi = {{10.1103/PhysRevB.89.235435}},
volume = {{89}},
year = {{2014}},
}