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Bloch Oscillations, Wannier-Stark Localisation and Coherent Terahertz Emission in Twisted Graphene Superlattices

Descrizione del progetto

Super-reticoli di grafene deformato emergono come potenziale candidato per la radiazione terahertz

Sotto l’influenza di una forza costante, una particella confinata in un potenziale periodico di un reticolo cristallino subisce le cosiddette oscillazioni di Bloch. Questo fenomeno quantistico è stato recentemente di grande interesse per i fisici in quanto vi sono prove che queste oscillazioni possono generare radiazioni terahertz coerenti. Finora, i progressi ottenuti nel campo sono stati ostacolati dalla mancanza di materiali adeguati che emettono questa radiazione. Il progetto BlochTG, finanziato dall’UE, esaminerà le interazioni luce-materia intrinseche delle oscillazioni di Bloch in super-reticoli di grafene deformato. Il potenziale del super-reticolo intrinseco a questa eterostruttura 2D disperde gli stati elettronici all’interno di una zona di Brillouin notevolmente piccola, rendendolo un buon candidato per le oscillazioni di Bloch. E, cosa ancora più importante, potrebbe rivelarsi un banco di prova ideale per applicazioni terahertz.

Obiettivo

For the next generation of photonic applications, there is a growing need for solid-state devices operating in the terahertz regime. Bloch oscillations – one of the oldest known quantum phenomena–describes the fundamental behaviour of electrons in crystals in which a strong DC electric-field should cause electron oscillations in real-space that emit radiation. The effect thus provides a unique route towards tunable terahertz technologies. However, experimental studies and the development of technologies based on Bloch oscillations have been hampered due to a lack of suitable materials. Twisted graphene superlattices have recently emerged as an exciting new class of 2D heterostructures whose electronic spectra can be dramatically modified by twisting the crystal layers relative to one another, creating exotic materials that do not exist in nature. In particular, the superlattice potential that is intrinsic to these systems disperses electronic states within a significantly small Brillouin zone, making them ideal candidates for Bloch oscillations. Using a combination of electrical measurements and world-unique cryogenic near-field/far-field terahertz optics, Project BlochTG combines the disciplines of quantum transport and quantum optics to probe the intrinsic light-matter interactions of Bloch oscillations in twisted graphene superlattices. The action will be carried out by the experienced researcher, who is an expert on quantum transport in twisted graphene superlattices, in the lab of Professor Frank Koppens, who has spent the last ten years pioneering the near-field optics techniques described in this proposal. Project BlochTG hence outlines a timely research effort that seeks to understand the foundations of solid-state physics whilst simultaneously investigating novel device concepts for future terahertz technologies, in-line with key objectives of the Horizon 2020 European Roadmap for Graphene Science and Technology.

Coordinatore

FUNDACIO INSTITUT DE CIENCIES FOTONIQUES
Contribution nette de l'UE
€ 160 932,48
Indirizzo
AVINGUDA CARL FRIEDRICH GAUSS 3
08860 Castelldefels
Spagna

Mostra sulla mappa

Regione
Este Cataluña Barcelona
Tipo di attività
Research Organisations
Collegamenti
Costo totale
€ 160 932,48