Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10414734" target="_blank" >RIV/00216208:11320/20:10414734 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=et0XIPJi2X" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=et0XIPJi2X</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/2053-1583/aba567" target="_blank" >10.1088/2053-1583/aba567</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers

Popis výsledku v původním jazyce

Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum-J(Z)= L-Z+S-Z - associated with the C-3 rotational lattice symmetry which assumes half integer values corresponding, modulo 3, to distinct states. Here we show, based on polarization resolved and low temperature magneto-optical spectroscopy experiments, that the conservation of the total angular momentum in these systems leads to a very efficient exciton-phonon interaction when the coupling is mediated through chiral phonons. We identify these phonons as the Gamma point E&quot; modes which despite carrying angular momentum +/- 1 are able to induce an excitonic spin-flip of -/+ 2 thanks to the C(3)symmetry. These experiments reveal the crucial role of electron-phonon interaction in the carrier dynamics of group 6 transition metal dichalcogenides.

Název v anglickém jazyce

Flipping exciton angular momentum with chiral phonons in MoSe2/WSe2 heterobilayers

Popis výsledku anglicky

Optical selection rules in monolayers of transition metal dichalcogenides and of their heterostructures are determined by the conservation of the z-component of the total angular momentum-J(Z)= L-Z+S-Z - associated with the C-3 rotational lattice symmetry which assumes half integer values corresponding, modulo 3, to distinct states. Here we show, based on polarization resolved and low temperature magneto-optical spectroscopy experiments, that the conservation of the total angular momentum in these systems leads to a very efficient exciton-phonon interaction when the coupling is mediated through chiral phonons. We identify these phonons as the Gamma point E&quot; modes which despite carrying angular momentum +/- 1 are able to induce an excitonic spin-flip of -/+ 2 thanks to the C(3)symmetry. These experiments reveal the crucial role of electron-phonon interaction in the carrier dynamics of group 6 transition metal dichalcogenides.

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

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

2D Materials [online]

ISSN

2053-1583

e-ISSN

—

Svazek periodika

7

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

041002

Kód UT WoS článku

000563243400001

EID výsledku v databázi Scopus

2-s2.0-85092780997