Charge-Order pattern in κ-BEDT-TTF salts: A model independent, selection rule approach
Abstract
A well known vibrational selection rule is invoked to determine the charge order (CO) pattern displayed by the most interesting members of the widely studied class of κ-BEDT-TTF salts and their molecular analogues. The selection rule indicates that an easily identifiable Raman band should be present if intra-dimer charge disproportionation occurs, constituting a sort of model independent ``litmus test''. The absence of such a band in the available Raman spectra of κ-BEDT-TTF salts exhibiting static of fluctuating CO, strongly suggests that the CO pattern involves inter-dimer CO, in contrast with the universally accepted intra-dimer disprortionation. This paper therefore poses a challenge for the theoretical modeling of the concerned salts: either the lack of the Raman band sensitive to intra-dimer CO pattern is explained, or the modeling of the multivariate, unique physical properties of these κ-phase salts (spin frustration, electronic ferroelectricity etc.) has to start from the perspective of a different ground state.
Related
- Structure Selection in Ionic Colloidal Crystals via Independent Charge Tuning.
- Charge-sensitive vibrational modes in BEDT-TTF salts: Signatures of charge ordering and site charge
- Pattern selection and biomass shifts in a vegetation model with nonlocal competition and Allee activation
- A Centre-Charge Selection Rule for the Wilson-Line Potential: The Fundamental Domain of Gauge-Higgs Unification Is Representation-Dependent (Part III)
- Higher-Order Competition as a Minimal Mechanism for Spatial Pattern Diversity in Population Dynamics
BibTeX
@misc{girlando2026chargeorder,
title = {{Charge-Order pattern in $κ$-BEDT-TTF salts: A model independent, selection rule approach}},
author = {Alberto Girlando},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00798},
eprint = {2611.00798},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00798},
}
RIS
TY - UNPB
TI - Charge-Order pattern in κ-BEDT-TTF salts: A model independent, selection rule approach
AU - Alberto Girlando
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00798
UR - https://arxiv.org/abs/2611.00798
AB - A well known vibrational selection rule is invoked to determine the charge order (CO) pattern displayed by the most interesting members of the widely studied class of κ-BEDT-TTF salts and their molecular analogues. The selection rule indicates that an easily identifiable Raman band should be present if intra-dimer charge disproportionation occurs, constituting a sort of model independent ``litmus test''. The absence of such a band in the available Raman spectra of κ-BEDT-TTF salts exhibiting static of fluctuating CO, strongly suggests that the CO pattern involves inter-dimer CO, in contrast with the universally accepted intra-dimer disprortionation. This paper therefore poses a challenge for the theoretical modeling of the concerned salts: either the lack of the Raman band sensitive to intra-dimer CO pattern is explained, or the modeling of the multivariate, unique physical properties of these κ-phase salts (spin frustration, electronic ferroelectricity etc.) has to start from the perspective of a different ground state.
ER -