# Polarization selectivity of charge localization induced by 7-fs nearly single-cycle light-field in an organic metal

## TL;DR

This study demonstrates that the polarization of a nearly single-cycle 7-fs light field can selectively induce charge localization in an organic metal, revealing polarization-dependent control of charge order in a triangular lattice system.

## Contribution

It provides new insights into polarization-selective charge localization induced by ultrafast light fields in organic conductors, combining experimental and numerical approaches.

## Key findings

- Charge order is efficiently induced when pump polarization is perpendicular to the CO axis.
- Polarization dependence of transient reflectivity spectra reveals control over charge localization.
- Numerical simulations confirm field-induced charge redistribution causes the observed effects.

## Abstract

Polarization selectivity of light-field-induced charge localization was investigated in an organic metal alpha-(BEDT-TTF)2I3 with a triangular lattice. Dependences of transient reflectivity spectra on polarizations of the 7-fs pump and probe lights indicate that a short-range charge order (CO) is efficiently induced from the metallic phase for the pump polarization perpendicular to the 1010-type CO axis. Numerical solution of a time-dependent Schrodinger equation clarified that the 1010-CO is induced by field-induced re-distribution of charges cooperating with competing inter-site Coulomb repulsions in the triangular lattice.

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Source: https://tomesphere.com/paper/1704.06776