Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Theoretical and Mathematical Physics

Unitary dynamical symmetry in a system of superradiant molecules and the classical limit

V. V. Zverov

Published Dec 1, 1976• 0 citations
Publisher
DOI
10.1007/bf01028240

Related papers

Connecting the quantum and classical worlds

Barbara Drossel

By considering (non‐relativistic) quantum mechanics as it is done in practice in particular in condensed‐matter physics, it is argued that a deterministic, unitary time evolution within a chosen Hilbert space always has a limited scope, leaving a lot of room for embedding the quantum‐classical transition into our current theories without recurring to difficult‐to‐accept interpretations of quantum mechanics. Nonunitary projections to initial and final states, the breaking of time‐reversal symmetry, a change of Hilbert space, and the introduction of classical concepts such as external potentials or localized atomic nuclei are widespread in quantum mechanical calculations. Furthermore, quantum systems require classical environments that enable the symmetry breaking that is necessary for creating the atomic configurations of molecules and crystals. This paper argues that such classical environments are provided by finite‐temperature macroscopic systems in which the range of quantum correlations and entanglement is limited. This leads to classical behavior on larger scales, and to collapse‐like events in all dynamical processes that become coupled to the thermalized degrees of freedom. image

arXiv:1609.04427•Annalen der Physik•Dec 21, 2016•4 citations

Problems of the dynamics of superradiant systems

N. N. Bogolyubov, A.S. Shumovskij

•Jan 1, 1984•0 citations

Superradiance study of molecular clusters in different cavities formed by scanning tunneling microscope tip and substrate

Zhihua LIU, Siyuan LYU, Meng Ran Zhou +1 more

The plasmon cavity system composed of a scanning tunneling microscope tip and a substrate has attracted much attention due to its ability to break through the diffraction limit, enhance the electromagnetic field by hundreds of times, and localize it on a nanometer or even sub-nanometer scale. This plasmon cavity system can serve as an advanced platform for studying superradiance phenomena on an ultrafast scale. Methylene blue molecules have many applications in the field of optics due to their significant light absorption and fluorescence emission characteristics. In this work, macroscopic quantum electrodynamics and open quantum system theory are used to explore the radiation dynamics of methylene blue molecular clusters with three different configurations: cyclic, two-dimensional planar, and one-dimensional chain, in specific scanning tunneling microscope nanocavity and picocavity. Taking the cyclic molecular clusters for example, the radiation effects of different external field excitations on the molecular clusters in the cavity are studied. The research results indicate that for the same molecular cluster configuration, the scanning tunneling microscope picocavity has a more significant superradiance intensity, while the scanning tunneling microscope nanocavity has a longer duration of superradiance. From the perspective of symmetry, the one-dimensional chain molecular clusters only have axial symmetry, while the two-dimensional planar and cyclic molecular clusters have both axial symmetry and central symmetry. The cyclic molecular clusters also have multiple rotational symmetries. Therefore, within the same scanning tunneling microscope cavity, the higher the symmetry of the arrangement of molecular clusters, the easier it is to generate significant superradiance pulses. In addition, because of its higher spatial resolution and stronger local field enhancement effect, the picocavity of scanning tunneling microscope is more sensitive to changes of external conditions such as excitation wavelength. These results indicate that the occurrence and enhancement of superradiance can be effectively controlled by reasonably designing the cavity structure and geometric configuration of molecular clusters, and the time scale of superradiance pulses can be extended to the picosecond order, which provides new ideas and methods for practical applications in the fields of optics and nanotechnology in the future.

Acta Physica Sinica•Jan 1, 2025•0 citations

Dynamical Symmetry and Generalized Coherent States

Vladimir G. Makhankov

Springer eBooks•Jan 1, 1990•0 citations

Thermodynamics and dynamics of spin systems in the phase transition to the superradiant state

Georgin Moiseevich Zaslavskiî, Yu. A. Kudenko, A. P. Slivinskiǐ

Theoretical and Mathematical Physics•Oct 1, 1977•4 citations

Chirality dependent photon transport and helical superradiance

Jonah S. Peter, Stefan Ostermann, Susanne F. Yelin

Chirality, or handedness, is a geometrical property denoting a lack of mirror symmetry. Chirality is ubiquitous in nature and is associated with the nonreciprocal interactions observed in complex systems ranging from biomolecules to topological materials. Here, we demonstrate that chiral arrangements of dipole-coupled atoms or molecules can facilitate the helicity-dependent superradiant emission of light. We show that the collective modes of these systems experience an emergent spin-orbit coupling that leads to chirality-dependent photon transport and nontrivial topological properties. These phenomena are fully described within the electric dipole approximation, resulting in very strong optical responses. Our results demonstrate an intimate connection between chirality, superradiance, and photon helicity and provide a comprehensive framework for studying electron transport dynamics in chiral molecules using cold atom quantum simulators. Published by the American Physical Society 2024

arXiv:2301.07231•Physical Review Research•May 22, 2024•10 citations
By considering (non‐relativistic) quantum mechanics as it is done in practice in particular in condensed‐matter physics, it is argued that a deterministic, unitary time evolution within a chosen Hilbert space always has a limited scope, leaving a lot of room for embedding the quantum‐classical transition into our current theories without recurring to difficult‐to‐accept interpretations of quantum mechanics. Nonunitary projections to initial and final states, the breaking of time‐reversal symmetry, a change of Hilbert space, and the introduction of classical concepts such as external potentials or localized atomic nuclei are widespread in quantum mechanical calculations. Furthermore, quantum systems require classical environments that enable the symmetry breaking that is necessary for creating the atomic configurations of molecules and crystals. This paper argues that such classical environments are provided by finite‐temperature macroscopic systems in which the range of quantum correlations and entanglement is limited. This leads to classical behavior on larger scales, and to collapse‐like events in all dynamical processes that become coupled to the thermalized degrees of freedom. image
The plasmon cavity system composed of a scanning tunneling microscope tip and a substrate has attracted much attention due to its ability to break through the diffraction limit, enhance the electromagnetic field by hundreds of times, and localize it on a nanometer or even sub-nanometer scale. This plasmon cavity system can serve as an advanced platform for studying superradiance phenomena on an ultrafast scale. Methylene blue molecules have many applications in the field of optics due to their significant light absorption and fluorescence emission characteristics. In this work, macroscopic quantum electrodynamics and open quantum system theory are used to explore the radiation dynamics of methylene blue molecular clusters with three different configurations: cyclic, two-dimensional planar, and one-dimensional chain, in specific scanning tunneling microscope nanocavity and picocavity. Taking the cyclic molecular clusters for example, the radiation effects of different external field excitations on the molecular clusters in the cavity are studied. The research results indicate that for the same molecular cluster configuration, the scanning tunneling microscope picocavity has a more significant superradiance intensity, while the scanning tunneling microscope nanocavity has a longer duration of superradiance. From the perspective of symmetry, the one-dimensional chain molecular clusters only have axial symmetry, while the two-dimensional planar and cyclic molecular clusters have both axial symmetry and central symmetry. The cyclic molecular clusters also have multiple rotational symmetries. Therefore, within the same scanning tunneling microscope cavity, the higher the symmetry of the arrangement of molecular clusters, the easier it is to generate significant superradiance pulses. In addition, because of its higher spatial resolution and stronger local field enhancement effect, the picocavity of scanning tunneling microscope is more sensitive to changes of external conditions such as excitation wavelength. These results indicate that the occurrence and enhancement of superradiance can be effectively controlled by reasonably designing the cavity structure and geometric configuration of molecular clusters, and the time scale of superradiance pulses can be extended to the picosecond order, which provides new ideas and methods for practical applications in the fields of optics and nanotechnology in the future.
Chirality, or handedness, is a geometrical property denoting a lack of mirror symmetry. Chirality is ubiquitous in nature and is associated with the nonreciprocal interactions observed in complex systems ranging from biomolecules to topological materials. Here, we demonstrate that chiral arrangements of dipole-coupled atoms or molecules can facilitate the helicity-dependent superradiant emission of light. We show that the collective modes of these systems experience an emergent spin-orbit coupling that leads to chirality-dependent photon transport and nontrivial topological properties. These phenomena are fully described within the electric dipole approximation, resulting in very strong optical responses. Our results demonstrate an intimate connection between chirality, superradiance, and photon helicity and provide a comprehensive framework for studying electron transport dynamics in chiral molecules using cold atom quantum simulators. Published by the American Physical Society 2024