Descrizione del progetto
Progettazione di stati quantistici elettronici nei solidi mediante interazioni di molte particelle
Pur essendo certamente un cliché, il motto «il tutto è più della somma delle singole parti» ha in effetti vaste applicazioni e gli stati elettronici nei solidi semiconduttori non fanno eccezione. Le forti interazioni tra molte particelle promettono di progettare artificialmente stati quantistici nella materia condensata con velocità e fedeltà senza precedenti, oltre l’ambito dei metodi tradizionali che si basano sulle proprietà del singolo elettrone. Il progetto CoulENGINE, finanziato dall’UE, intende introdurre e sviluppare un approccio non invasivo, basato sulla prossimità, per creare e manipolare strutture elettroniche nei nanomateriali adattando le interazioni elettrodinamiche di Coulomb su scale temporali ultraveloci.
Obiettivo
Key phenomena in condensed matter are determined by the properties of the electronic states, strongly motivating the development of strategies for their artificial design. In semiconducting solids, heavily studied from fundamental and technological perspectives, electronic structures are currently defined using strong perturbations of the materials such as tuning the chemical composition, changing the geometry, or applying external fields. Traditional concepts, however, inherently rely on modifying single-particle properties of individual electrons, while the influence of many-particle interactions has been largely neglected in the context of bandstructure engineering so far. In addition, conventional methods start to approach intrinsic barriers in today’s technology, driving an intense search for fundamentally novel concepts.
Here, I propose to explore an alternative pathway to design and manipulate electronic states in matter that is exclusively based on many-particle interactions between electronic excitations mediated by Coulomb forces. These are exceptionally strong in two-dimensional (2D) semiconductors with a major impact on the energies of the electronic states, and are highly sensitive to the dielectric surroundings. Using layered heterostructures I intend to show how the dielectric environment of a 2D semiconductor can be tuned on ultrafast timescales by pulsed optical injection to manipulate electronic states via proximity screening. Similarly, external screening will be used to study how the geometry of proximate objects can be imprinted on the electronic structure of a 2D layer, creating dielectrically defined zero-, one-, and two-dimensional potentials in one unified system. Ultimately, the realization of rapidly tunable electronic quantum states through dielectric environment will offer novel, versatile experimental platforms for fundamental many-body physics research and establish a new approach for electronic structure engineering on the nanoscale.
Campo scientifico
Programma(i)
Argomento(i)
Meccanismo di finanziamento
ERC-COG - Consolidator GrantIstituzione ospitante
01069 Dresden
Germania