Magnetically tuned Kondo effect in a molecular double quantum dot: Role of the anisotropic exchange

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F19%3A00521572" target="_blank" >RIV/68378271:_____/19:00521572 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/19:10398921

Výsledek na webu

<a href="https://doi.org/10.1021/acs.jpcc.9b00783" target="_blank" >https://doi.org/10.1021/acs.jpcc.9b00783</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.9b00783" target="_blank" >10.1021/acs.jpcc.9b00783</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Magnetically tuned Kondo effect in a molecular double quantum dot: Role of the anisotropic exchange

Popis výsledku v původním jazyce

We investigate theoretically and experimentally the singlet–triplet Kondo effect induced by a magnetic field in a molecular junction. Temperature-dependent conductance, G(T), is calculated by the numerical renormalization group, showing a strong imprint of the relevant low-energy scales, such as the Kondo temperature, exchange, and singlet–triplet splitting. We demonstrate the stability of the singlet–triplet Kondo effect against weak spin anisotropy, modeled by an anisotropic exchange. Moderate spin anisotropy manifests itself by lowering the Kondo plateaus, causing the G(T) to deviate from a standard temperature dependence, expected for a spin-half Kondo effect. We propose this scenario as an explanation for anomalous G(T), measured in an organic diradical molecule coupled to gold contacts. We uncover certain new aspects of the singlet–triplet Kondo effect, such as coexistence of spin-polarization on the molecule with Kondo screening.

Název v anglickém jazyce

Magnetically tuned Kondo effect in a molecular double quantum dot: Role of the anisotropic exchange

Popis výsledku anglicky

We investigate theoretically and experimentally the singlet–triplet Kondo effect induced by a magnetic field in a molecular junction. Temperature-dependent conductance, G(T), is calculated by the numerical renormalization group, showing a strong imprint of the relevant low-energy scales, such as the Kondo temperature, exchange, and singlet–triplet splitting. We demonstrate the stability of the singlet–triplet Kondo effect against weak spin anisotropy, modeled by an anisotropic exchange. Moderate spin anisotropy manifests itself by lowering the Kondo plateaus, causing the G(T) to deviate from a standard temperature dependence, expected for a spin-half Kondo effect. We propose this scenario as an explanation for anomalous G(T), measured in an organic diradical molecule coupled to gold contacts. We uncover certain new aspects of the singlet–triplet Kondo effect, such as coexistence of spin-polarization on the molecule with Kondo screening.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/GA16-19640S" target="_blank" >GA16-19640S: Vibrační efekty v nerovnovážném elektronovém transportu přes nanosystémy</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

123

Číslo periodika v rámci svazku

18

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

11917-11925

Kód UT WoS článku

000467781000063

EID výsledku v databázi Scopus

2-s2.0-85065620937