H2020Индивидуална стипендия2021–2023

SingExTr · Single Exciton Transistor based on van der Waals Heterostructures

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

Период: 2021-03-01 → 2023-02-28
Финансиране от ЕС: 212 934 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Двуизмерните хетероструктури от WSe2 и MoSe2 се използват за създаване на транзистор, който улавя единични частици (екситони) чрез електрическо поле. Това помага за разбирането на магнитните свойства и взаимодействията между частиците, което е важно за развитието на фотонни чипове.

Този кратък обзор е генериран от изкуствен интелект

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

Резултати накратко

Single Exciton Transistor based on van der Waals Heterostructures

We aimed to realize Coulomb blockade with IXs, which possess strong and tunable dipolar interaction. In this proposal we aimed to develop a proof-of-concept optoelectronic device of a 2D heterostructure to electrostatically trap IX at single particle level and perform the quantum optical characterization on the gate defined trapping site. Moreover, we intended to harness the dipolar nature, i.e. spatial wavefunction overlap of the excitons, by tunning the electrostatic potential landscape. Such signatures would be characterized by magneto-optical spectroscopy and auto- and cross-correlation measurement with a Hanbury Brown and Twiss interferometer. In these regards, we fabricated exciton transistor device prototypes based on bilayer WSe2 and MoSe2. We realized the Stark shift of interlayer exciton for both materials, which is essential for electrical control of excitonic device. Although we did not realize pinching down the exciton current due to the experimental challenges. By applying electric field we successfully tailored the interlayer exciton transitions and surprisingly we revealed rich exciton complexes and intra-interlayer exciton hybridization. With a Hanbury Brown and Twiss interferometer we conducted photon correlation measurement to study the dynamic evolution of the spin triplet as a function of exciton density and interpret the evolution as a result of dipolar interaction which is in contrast to bare Augur recombination, which is the case for intralayer excitons. The results are of great significance to disparate scientific communities: condensed-matter, quantum optics, 2D materials, integrated electronic and photonic chips, etc. The knowledge of how to generate interlayer exciton and control their spatial wave functions and magnetic properties opens new technological possibilities which quantum engineers can take advantage of in future technologies. We also will widely disseminated our results and discoveries in high impact peer reviewed journals and top international conferences (APS March Meeting and Gordon Research Conference).

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

Цел на проекта

The spin degree of freedom of an electron captures the essence of quantum mechanics. Via a phenomenon called Coulomb blockade, electrons can be loaded one-by-one into a microscopic device, and their spin can be probed by electrical or optical readouts, satisfying some criteria to construct a quantum processor.Unfortunately, electrons interact indirectly with light (photons), essential for ultra-fast coherent control and to communicate the quantum information over long distances. Conversely, an exciton – a quasiparticle consisting of a strongly bound electron-hole pair in a semiconductor – interacts with light very strongly. With the emergence of atomically thin semiconductors which have exciton binding energies and Coulomb interactions ~ 100x larger than traditional semiconductors such as GaAs, it is possible to engineer a single exciton transistor. In this fellowship, I propose to pursue excitonic transport and controlled electrostatic trapping of single excitons. To realize such devices, I will stack atom-thick flakes together to form 2D heterostructures which allow separation of the electron and hole into different layers, creating an interlayer exciton which has a long lifetime, a large permanent dipole, and convenient energy scales. The interlayer excitons can strongly interact with each other, providing the repulsion energy to realize excitonic Coulomb blockade. Success in this endeavor opens a path to realizing novel sources of single photons, entangled photons, and efficient spin-photon interfaces. This Fellowship will offer me the opportunity to acquire new skills regarding magneto-optical spectroscopy, quantum optics, transport device design and fabrication. It builds on my PhD project, where I focused on intralayer excitons in 2D materials and heterostructure fabrication. This project exploits my strong background in material/device preparation and marries it with quantum optics, which is the expertise of host group.

Оригинален текст от CORDIS (на английски).

Участници

HERIOT-WATT UNIVERSITY · EdinburghКоординаторОбединеното кралство