Explanipedia

Efficient calculation of trion energies in monolayer transition metal dichalcogenides Open

Sangeet S. Kumar, Brendan C. Mulkerin, Antonio Tiene, F. M. Marchetti, Meera M. Parish , et al. · 2024

The reduced dielectric screening in atomically thin semiconductors leads to remarkably strong electron interactions. As a result, bound electron-hole pairs (excitons) and charged excitons (trions), which have binding energies in the hundre…

Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry Open

Antonio Tiene, Andrés Tamargo Bracho, Meera M. Parish, Jesper Levinsen, F. M. Marchetti · 2024

The dataset that supports the findings of this study are archived in the Universidad Autónoma de Madrid data repository e‐cienciaDatos in https://doi.org/10.21950/UTHVWP

Multiple polaron quasiparticles with dipolar fermions in a bilayer geometry Open

Antonio Tiene, Andrés Tamargo Bracho, Meera M. Parish, Jesper Levinsen, F. M. Marchetti · 2024

We study the Fermi polaron problem with dipolar fermions in a bilayer geometry, where a single dipolar particle in one layer interacts with a Fermi sea of dipolar fermions in the other layer. By evaluating the polaron spectrum, we obtain t…

Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature Open

Antonio Tiene, Brendan C. Mulkerin, Jesper Levinsen, Meera M. Parish, F. M. Marchetti · 2023

We study systematically the role of temperature in the optical response of doped two-dimensional semiconductors. By making use of a finite-temperature Fermi-polaron theory, we reveal a crossover from a quantum-degenerate regime with well-d…

Exact Quantum Virial Expansion for the Optical Response of Doped Two-Dimensional Semiconductors Open

Brendan C. Mulkerin, Antonio Tiene, F. M. Marchetti, Meera M. Parish, Jesper Levinsen · 2023

We introduce a quantum virial expansion for the optical response of a doped two-dimensional semiconductor. As we show, this constitutes a perturbatively exact theory in the high-temperature or low-doping regime, where the electrons' therma…

Crossover from exciton polarons to trions in doped two-dimensional semiconductors at finite temperature Open

A. Tiene, Brendan C Mulkerin, J. Levinsen, M. M. Parish, F. M. Marchetti · 2022

We study systematically the role of temperature in the optical response of doped two-dimensional semiconductors. By making use of a finite-temperature Fermi-polaron theory, we reveal a crossover from a quantum-degenerate regime with well-d…

Exact Quantum Virial Expansion for the Optical Response of Doped Two-Dimensional Semiconductors Open

Brendan C. Mulkerin, Antonio Tiene, F. M. Marchetti, Meera M. Parish, Jesper Levinsen · 2022

We present a quantum virial expansion for the optical response of a doped two-dimensional semiconductor. As we show, this constitutes a perturbatively exact theory in the high-temperature or low-doping regime, where the electrons' thermal …

Rydberg exciton-polaritons in a magnetic field Open

Emma Laird, F. M. Marchetti, Dmitry K. Efimkin, Meera M. Parish, Jesper Levinsen · 2022

We theoretically investigate exciton-polaritons in a two-dimensional (2D) semiconductor heterostructure, where a static magnetic field is applied perpendicular to the plane. To explore the interplay between the magnetic field and strong li…

Rydberg Exciton-Polaritons in a Magnetic Field Open

Emma Laird, F. M. Marchetti, Dmitry K. Efimkin, Meera M. Parish, Jesper Levinsen · 2022

We theoretically investigate exciton-polaritons in a two-dimensional (2D) semiconductor heterostructure, where a static magnetic field is applied perpendicular to the plane. To explore the interplay between magnetic field and a strong ligh…

Effect of fermion indistinguishability on optical absorption of doped two-dimensional semiconductors Open

Antonio Tiene, Jesper Levinsen, Jonathan Keeling, Meera M. Parish, F. M. Marchetti · 2022

We study the optical absorption spectrum of a doped two-dimensional\nsemiconductor in the spin-valley polarized limit. In this configuration, the\ncarriers in the Fermi sea are indistinguishable from one of the two carriers\nforming the ex…

Crescent States in Charge-Imbalanced Polariton Condensates Open

Artem Strashko, F. M. Marchetti, A. H. MacDonald, Jonathan Keeling · 2020

We study two-dimensional charge-imbalanced electron-hole systems embedded in an optical microcavity. We find that strong coupling to photons favors states with pairing at zero or small center-of-mass momentum, leading to a condensed state …

Spectroscopic Signatures of Quantum Many-Body Correlations in Polariton Microcavities Open

Jesper Levinsen, F. M. Marchetti, Jonathan Keeling, Meera M. Parish · 2019

We theoretically investigate the many-body states of exciton polaritons that can be observed by pump-probe spectroscopy in high-Q inorganic microcavities. Here, a weak-probe "spin-down" polariton is introduced into a coherent state of "spi…

Early-time dynamics of Bose gases quenched into the strongly interacting regime Open

A. Muñoz de las Heras, Meera M. Parish, F. M. Marchetti · 2019

We study the early-time dynamics of a degenerate Bose gas after a sudden\nquench of the interaction strength, starting from a weakly interacting gas. By\nmaking use of a time-dependent generalization of the Nozi\\`eres-Saint-James\nvariati…

Spontaneous patterns in coherently driven polariton microcavities Open

Guillermo Díaz-Camacho, C. Tejedor, F. M. Marchetti · 2018

We consider a polariton microcavity resonantly driven by two external lasers which simultaneously pump both lower and upper polariton branches at normal incidence. In this setup, we study the occurrence of instabilities of the pump-only so…

Dipolar fermions in a multilayer geometry Open

Michele Callegari, Meera M. Parish, F. M. Marchetti · 2017

We investigate the behavior of identical dipolar fermions with aligned dipole moments in two-dimensional multilayers at zero temperature. We consider density instabilities that are driven by the attractive part of the dipolar interaction a…

Matter-Light Condensates Reach Thermal Equilibrium Open

Jonathan Keeling, F. M. Marchetti · 2017

The experimental realization of Bose-Einstein condensation (BEC) with atoms and quasiparticles has triggered wide exploration of macroscopic quantum effects.Microcavity polaritons are of particular interest because quantum phenomena such a…

Vortex and half-vortex dynamics in a nonlinear spinor quantum fluid Open

Lorenzo Dominici, Galbadrakh Dagvadorj, J. M. Fellows, Dario Ballarini, Milena De Giorgi , et al. · 2015

Two-dimensional fluid of polaritons sheds light on quantum vortex dynamics.

Multicomponent polariton superfluidity in the optical parametric oscillator regime Open

Andrei Berceanu, Lorenzo Dominici, Iacopo Carusotto, Dario Ballarini, E. Cancellieri , et al. · 2015

Superfluidity, which is the ability of a liquid or gas to flow with zero viscosity, is one of the most remarkable implications of collective quantum coherence. In equilibrium systems such as liquid 4He and ultracold atomic gases, superflui…

Spontaneous rotating vortex rings in a parametrically driven polariton fluid Open

J. O. Hamp, Andrew K. Balin, F. M. Marchetti, D. Sanvitto, M. H. Szymańska · 2015

We present the theoretical prediction of spontaneous rotating vortex rings in\na parametrically driven quantum fluid of polaritons -- coherent superpositions\nof coupled quantum well excitons and microcavity photons. These rings arise not\…

Probing the collective excitations of a spinor polariton fluid Open

Mathias Van Regemortel, Michiel Wouters, F. M. Marchetti · 2015

We propose a pump-probe set-up to analyse the properties of the collective\nexcitation spectrum of a spinor polariton fluid. By using a linear response\napproximation scheme, we carry on a complete classification of all excitation\nspectra…

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