Engineering the Radiative Dynamics of Thermalized Excitons with Metal
Interfaces
- URL: http://arxiv.org/abs/2110.05577v1
- Date: Mon, 11 Oct 2021 19:40:24 GMT
- Title: Engineering the Radiative Dynamics of Thermalized Excitons with Metal
Interfaces
- Authors: Grace H. Chen, David Z. Li, Amy Butcher, Alexander A. High, Darrick E.
Chang
- Abstract summary: We analyze the emission properties of excitons in TMDCs near planar metal interfaces.
We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude.
nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
- Score: 58.720142291102135
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: As a platform for optoelectronic devices based on exciton dynamics, monolayer
transition metal dichalcogenides (TMDCs) are often placed near metal interfaces
or inside planar cavities. While the radiative properties of point dipoles at
metal interfaces has been studied extensively, those of excitons, which are
delocalized and exhibit a temperature-dependent momentum distribution, lack a
thorough treatment. Here, we analyze the emission properties of excitons in
TMDCs near planar metal interfaces and explore their dependence on exciton
center-of-mass momentum, transition dipole orientation, and temperature.
Defining a characteristic energy scale $k_B T_c = (\hbar k)^2/2m$~($k$ being
the radiative wavevector and $m$ the exciton mass), we find that at
temperatures $T\gg T_c$ and low densities where the momentum distribution can
be characterized by Maxwell-Boltzmann statistics, the modified emission
rates~(normalized to free space) behave similarly to point dipoles at
temperatures $T\gg T_c$. This similarity in behavior arises due to the broad
nature of wavevector components making up the exciton and point dipole
emission. On the other hand, the narrow momentum distribution of excitons for
$T<T_c$ can result in significantly different emission behavior as compared to
point dipoles. These differences can be further amplified by considering
excitons with a Bose Einstein distribution at high phase space densities. We
find suppression or enhancement of emission relative to the point dipole case
by several orders of magnitude. These insights can help optimize the
performance of optoelectronic devices that incorporate 2D semiconductors near
metal electrodes and can inform future studies of exciton radiative dynamics at
low temperatures. Additionally, these studies show that nanoscale optical
cavities are a viable pathway to generating long-lifetime exciton states in
TMDCs.
Related papers
- Ferromagnetic semimetal and charge-density wave phases of interacting electrons in a honeycomb moiré potential [11.888482610984967]
We study the two-dimensional electron gas on a honeycomb moir'e lattice at quarter filling.
With increasing moir'e potential, the systems transitions from a paramagnetic metal to an itinerant ferromagnetic semimetal.
arXiv Detail & Related papers (2024-06-03T18:19:38Z) - Confined Meson Excitations in Rydberg-Atom Arrays Coupled to a Cavity
Field [0.0]
Confinement is a pivotal phenomenon in numerous models of high-energy and statistical physics.
In this study, we investigate the emergence of confined meson excitations within a one-dimensional system, comprising Rydberg-dressed atoms trapped and coupled to a cavity field.
We suggest a method for the photonic characterization of these confined excitations, utilizing homodyne detection and single-site imaging techniques to observe the localized particles.
arXiv Detail & Related papers (2023-12-28T22:18:27Z) - Fragmented superconductivity in the Hubbard model as solitons in
Ginzburg-Landau theory [58.720142291102135]
Superconductivity and charge density waves are observed in close vicinity in strongly correlated materials.
We investigate the nature of such an intertwined state of matter stabilized in the phase diagram of the elementary $t$-$tprime$-$U$ Hubbard model.
We provide conclusive evidence that the macroscopic wave functions of the superconducting fragments are well-described by soliton solutions of a Ginzburg-Landau equation.
arXiv Detail & Related papers (2023-07-21T18:00:07Z) - Tailoring Exciton Dynamics in TMDC Heterobilayers in the Quantum
Plasmonic Regime [0.0]
Control of excitons in transition metal dichalcogenides (TMDCs) is interesting for tailoring light-matter interactions.
We investigated excitons dynamics in TMDC heterobilayers via locally controlled junction current.
Our results show that tip-induced radiative relaxation of intralayer (interlayer) excitons becomes dominant in the quantum tunneling regime.
arXiv Detail & Related papers (2023-06-10T03:19:42Z) - Bosonic Delocalization of Dipolar Moir\'e Excitons [0.0]
tunable moir'e potentials emerge, trapping excitons into periodic arrays.
Recent experiments have demonstrated density-dependent transport properties of moir'e excitons.
We develop a microscopic theory of interacting excitons in external potentials.
arXiv Detail & Related papers (2023-06-01T09:06:33Z) - Higher-order topological Peierls insulator in a two-dimensional
atom-cavity system [58.720142291102135]
We show how photon-mediated interactions give rise to a plaquette-ordered bond pattern in the atomic ground state.
The pattern opens a non-trivial topological gap in 2D, resulting in a higher-order topological phase hosting corner states.
Our work shows how atomic quantum simulators can be harnessed to investigate novel strongly-correlated topological phenomena.
arXiv Detail & Related papers (2023-05-05T10:25:14Z) - Photoinduced prethermal order parameter dynamics in the two-dimensional
large-$N$ Hubbard-Heisenberg model [77.34726150561087]
We study the microscopic dynamics of competing ordered phases in a two-dimensional correlated electron model.
We simulate the light-induced transition between two competing phases.
arXiv Detail & Related papers (2022-05-13T13:13:31Z) - Tuning long-range fermion-mediated interactions in cold-atom quantum
simulators [68.8204255655161]
Engineering long-range interactions in cold-atom quantum simulators can lead to exotic quantum many-body behavior.
Here, we propose several tuning knobs, accessible in current experimental platforms, that allow to further control the range and shape of the mediated interactions.
arXiv Detail & Related papers (2022-03-31T13:32:12Z) - Unraveling the temperature dynamics and hot electron generation in
tunable gap-plasmon metasurface absorbers [0.0]
Localized plasmons formed in ultrathin metallic nanogaps can lead to robust absorption of incident light.
Plasmon metasurfaces based on this effect can efficiently generate energetic charge carriers, also known as hot electrons.
arXiv Detail & Related papers (2022-03-29T20:51:14Z) - Optically pumped spin polarization as a probe of many-body
thermalization [50.591267188664666]
We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers.
We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength.
Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
arXiv Detail & Related papers (2020-05-01T23:16:33Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.