Optical response of a topological-insulator--quantum-dot hybrid
interacting with a probe electric field
- URL: http://arxiv.org/abs/2007.06145v1
- Date: Mon, 13 Jul 2020 01:24:53 GMT
- Title: Optical response of a topological-insulator--quantum-dot hybrid
interacting with a probe electric field
- Authors: L. A. Castro-Enriquez, L. F. Quezada, and A. Mart\'in-Ruiz
- Abstract summary: We study the interaction between a topological insulator nanoparticles and a quantum dot subject to an applied electric field.
The optical absorption spectrum exhibits Fano resonances with a line shape that strongly depends on the polarization of the electric field.
Our results can also be applied to nontopological magnetoelectric materials such as Cr$_2$O$_3$.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study the interaction between a topological insulator nanoparticle and a
quantum dot subject to an applied electric field. The electromagnetic response
of the topological insulator is derived from axion electrodynamics in the
quasistatic approximation. Localized modes are quantized in terms of dipolar
bosonic modes, which couples dipolarly to the quantum dot. Hence, we treat the
hybrid as a two-level system interacting with a single bosonic mode, where the
coupling strength encodes the information concerning the nontrivial topology of
the nanoparticle. The interaction of the hybrid with the environment is
implemented through the coupling with a continuum reservoir of radiative output
modes and a reservoir of phonon modes. In particular, we use the method of
Zubarev's Green functions to derive an expression for the optical absorption
spectrum of the system. We apply our results to a realistic system which
consists of a topological insulator nanoparticle made of TlBiSe$_{2}$
interacting with a cadmium selenide quantum dot, both immersed in a polymer
layer such as poly(methyl methacrylate). The optical absorption spectrum
exhibits Fano resonances with a line shape that strongly depends on the
polarization of the electric field as well as on the topological
magnetoelectric polarizability $\theta$. Our results and methods can also be
applied to nontopological magnetoelectric materials such as Cr$_{2}$O$_{3}$.
Related papers
- Cavity-Born Oppenheimer Approximation for Molecules and Materials via Electric Field Response [0.0]
We present an ab initio method for computing vibro-polariton and phonon-polariton spectra of molecules and solids coupled to the photon modes of optical cavities.
arXiv Detail & Related papers (2024-07-19T18:12:39Z) - Long-range interactions in Weyl dense atomic arrays protected from dissipation and disorder [41.94295877935867]
Long-range interactions are a key resource in many quantum phenomena and technologies.
We show how to design the polaritonic bands of these atomic metamaterials to feature a pair of frequency-isolated Weyl points.
These Weyl excitations can thus mediate interactions that are simultaneously long-range, due to their gapless nature; robust, due to the topological protection of Weyl points; and decoherence-free, due to their subradiant character.
arXiv Detail & Related papers (2024-06-18T20:15:16Z) - Ab-initio Simulations of Coherent Phonon-Induced Pumping of Carriers in
Zirconium Pentatelluride [12.482601299938173]
We show that a coherent $A_text1g$ Raman mode modulation can effectively pump carriers across the band gap.
We reveal the microscopic mechanism of this effect which occurs via Landau-Zener-St"uckelberg tunneling of Bloch electrons in a narrow region in the Brillouin zone center.
arXiv Detail & Related papers (2023-04-17T17:17:59Z) - Hybrid THz architectures for molecular polaritonics [1.7615102415144135]
Physical and chemical properties of materials can be modified by a resonant optical mode.
Here, we investigate several schemes of electromagnetic field confinement aimed at facilitating the collective coupling of a localized photonic mode to molecular vibrations in the terahertz region.
More importantly, we demonstrate enhanced vacuum Rabi splittings reaching up to 200 GHz when combining plasmonic resonances, photonic cavity modes and low-energy molecular resonances.
arXiv Detail & Related papers (2023-04-07T14:15:51Z) - Topological multi-mode waveguide QED [49.1574468325115]
We show how to take advantage of topologically protected propagating modes by interfacing them with quantum emitters.
Such capabilities pave the way for generating quantum gates among topologically protected photons as well as generating more complex entangled states of light in topological channels.
arXiv Detail & Related papers (2022-07-05T14:48:50Z) - Molecular Interactions Induced by a Static Electric Field in Quantum
Mechanics and Quantum Electrodynamics [68.98428372162448]
We study the interaction between two neutral atoms or molecules subject to a uniform static electric field.
Our focus is to understand the interplay between leading contributions to field-induced electrostatics/polarization and dispersion interactions.
arXiv Detail & Related papers (2021-03-30T14:45:30Z) - Nonlinear level attraction of cavity axion polariton in
antiferromagnetic topological insulator [18.199592421807928]
Axion quasiparticles, emerging in topological insulators, were predicted to strongly couple with the light and generate the so-called axion polariton.
Here, we demonstrate that there arises a gapless level attraction in cavity axion polariton of antiferromagnetic topological insulators.
Our results reveal a new mechanism of level attractions, and open up new roads for exploring the axion polariton with cavity technologies.
arXiv Detail & Related papers (2020-11-10T05:38:12Z) - Fano resonances induced by the topological magnetoelectric effect [0.0]
We investigate the interaction between a topological insulator nanosphere made of TlBiSe$$ interacting with a CdSe quantum dot.
We find the emergence of Fano resonances which are direct manifestations of the $mathbbZ_2$ invariant of topological insulators.
arXiv Detail & Related papers (2020-09-30T15:08:11Z) - Fast electrical modulation of strong near-field interactions between
erbium emitters and graphene [42.60602838972598]
We show fast, all-electrical modulation of the near-field interactions between a nanolayer of erbium emitters and graphene.
We demonstrate strong interactions with a >1,000-fold increased decay rate for 25% of the emitters.
This opens routes to quantum entanglement generation by collective plasmon emission or photon emission with controlled waveform.
arXiv Detail & Related papers (2020-07-22T08:48:01Z) - Quantum Many-Body Physics with Ultracold Polar Molecules: Nanostructured
Potential Barriers and Interactions [2.409938612878261]
We design dipolar quantum many-body Hamiltonians that will facilitate the realization of exotic quantum phases.
The main idea is to modulate both single-body potential barriers and two-body dipolar interactions on a spatial scale of tens of nanometers.
arXiv Detail & Related papers (2020-01-31T12:30:12Z)
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.