Moiré-trapped interlayer trions in charge-tunable WSe2/MoSe2 hetero-bilayers


Moiré-trapped interlayer trions in charge-tunable WSe2/MoSe2 hetero-bilayers

Wed, 02/02/2022 - 15:00 to 16:00


Mauro Brotons i Gisbert
Heriot Watt University

The unique physical properties of two-dimensional materials, combined with the ability to stack unlimited combinations of atomic layers with arbitrary crystal angle, has unlocked a new paradigm in designer quantum materials. For example, when two different monolayers are brought into contact to form a hetero-bilayer, the electronic interaction between the two layers results in a spatially periodic potential-energy landscape: the moiré superlattice. The moiré superlattice can create flat bands and quench the kinetic energy of electrons, giving rise to strongly correlated electron systems. Further, single particle wave packets can be trapped in the moiré potential pockets with three-fold symmetry to form ‘quantum dots’ which can emit single photons. Here I will present recent magneto-optical spectroscopy results of MoSe2/WSe2 hetero-bilayer devices with a small relative angle twist. I will discuss moiré-trapped interlayer neutral and charged excitons, which can emit quantum light, and can be exploited to probe the local charge environment of the trapped excitons as a function of the fractional filling of the moiré lattice.


He graduated in Physics, completed an MSc in Advanced Physics, and obtained a Ph.D. in Physics from the University of Valencia in 2011, 2012 and 2017, respectively. In 2017, he joined Heriot-Watt University as a Post-Doctoral Research Associate (2017-2021). His post-doctoral research mainly focused on the quantum optics and optical spectroscopy of quantum systems in two-dimensional van der Waals semiconductors and their heterostructures. In October 2021, he was awarded a Royal Society University Research Fellowship to develop new quantum materials to investigate the Hubbard model of strongly-correlated particles.