H2020Индивидуална стипендия2021–2023

2DCHEX · Tuning emission of charged excitons in two-dimensional transition metal dichalcogenide monolayers

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2021-07-01 → 2023-06-30
Финансиране от ЕС: 207 312 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Двуизмерните кристали от преходни метални дихалкогениди се изследват чрез използване на заредени екзитони за управление на квантовата информация. Това помага за работата на опто-долинните технологии при стайна температура, което може да подобри изчисленията в компютрите и смартфоните.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

Tuning emission of charged excitons in two-dimensional transition metal dichalcogenide monolayers

Transition metal dichalcogenide (TMD) monolayers are two-dimensional (2D) crystals with a thickness of only a few atoms yet exhibiting extremely rich and extraordinary physical properties. Unlike bulk TMD crystals, their monolayers are semiconductors with a direct electronic band gap, which makes them ideal candidates for optoelectronic applications. Moreover, the monolayer crystal structure does not have an inversion centre, thus providing an additional degree of freedom for encoding and processing of quantum information – so-called valley states in K and -K points of the Brillouin zone. Conveniently, these quantum degrees of freedom can be addressed optically with circularly polarized light constituting a new opto-valleytronic technology. Altogether, TMD-based valleytronic devices are anticipated to bring disruptive innovations that will impact our daily life. However, temperature-dependent parasitic processes may cause valley depolarization and loss of all the remarkable properties at room temperature, narrowing the operation of opto-valleytronic technologies only to the cryogenic temperatures, which severely hamper any practical application in our room-temperature environment. The ambition of this MSCA Individual Fellowship (2DCHEX - 2D CHarged EXitons) was to exploit charged excitonic states to tackle the valley depolarization and enable the remarkable features at room temperature. This functionality holds great potential for quantum technologies capable of boosting information processing and computation abilities beyond our imagination. In a broader perspective, such devices could replace current classical informational and computing technologies, effectively impacting everyone who uses a computer or a smartphone today. Quantum room-temperature opto-valleytronic devices have the potential to revolutionize the security of our communication and enable exponentially more powerful computational capabilities. The proposed idea within the 2DCHEX project was to develop an approach for inducing charged excitonic states. Electrochemical charging has been suggested here for the ultimate control of charged excitons and their emission properties, since such an approach provided the strongest electron doping in comparison with optical, electrostatic, chemical, or mechanical doping. Via controlling the charging state of an exciton one could influence the temperature-dependent parasitic processes by boosting the emission rate and charge-screening the valley depolarization. To conclude, the 2DCHEX action was indeed successful in achieving high and robust valley polarization at room temperature. Moreover, other extraordinary properties of excitons in 0D and 2D systems were explored to purify and control quantum emission at room temperature.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Transition metal dichalcogenide (TMD) monolayers constitute an attractive material platform due to additional degrees of freedom in encoding and processing quantum information. Currently, the use of these degrees of freedom in valleytronics is hampered due to the low valley polarization of the neutral exciton at room temperature. Recently, charged excitons have been demonstrated to exhibit high valley polarization even at room temperature albeit with low quantum yield and have a need for sophisticated charge doping techniques. This action proposes a novel electro-optical interface based on electron doping of TMD monolayers. I suggest to use the electric double layers to control the formation of charged excitons, and to use complex nanoantennas to enhance and collimate generated emission. My goal is to develop a quantum device merging fields of electrochemistry, photonics, plasmonics and TMD materials, giving practical access to new degrees of freedom for future valleytronic applications. The objectives are to demonstrate the exciton charging in TMD monolayers using a custom-built electrochemical cell and to tune electrically charged-exciton emission through the manipulation of the Fermi level, i.e., chemical potential. I aim to use the tuning of emission energy for coupling the charged exciton with a narrow resonance of a complex nanoantenna. This antenna will increase the extraction efficiency by directing the emission of charged excitons and enhancing their generation rate. Furthermore, I aim to explore the chirality of valley polarization and address the emission of charged excitons for their directional coupling with plasmons in high quality wedge waveguides based on crystalline gold micro-flakes. The overarching aim of my action is the development of a novel bright, directional, and electrically tunable quantum emitting device operating at room temperature for future quantum computing and information technologies.

Оригинален текст от CORDIS (на английски).

Участници

SYDDANSK UNIVERSITET · Odense MКоординаторДания