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

arXiv:0902.2540 · Physical Review B

Electromagnetic radiation emanating from the molecular nanomagnet Fe 8

Oren Shafir, Amit Keren

Published May 11, 2009• 8 citations
arXivHTMLPDF

Abstract

Photons emitted by transition between the discrete levels of single molecular magnets might obey the elementary condition for Dicke's super-radiance. We investigate this possibility in the ${\text{Fe}}_{8}$ molecule where magnetization jumps are known to occur at discrete magnetic-field values. We found energy bursts each time the molecule undergoes a magnetization jump, confirming their quantum nature. A series of tests indicated that photons carry out the energy and that indeed these photons obey the elementary conditions for super-radiance.

DOI
10.1103/physrevb.79.180404

Related papers

Electromagnetic radiation emanating from the molecular nanomagnet Fe$_{8}$

Amit Keren, Oren Shafir

Photons emitted by transition between the discrete levels of single molecular magnets might obey the elementary condition for Dicke’s super-radiance. We investigate this possibility in the Fe8 molecule where magnetization jumps are known to occur at discrete magnetic-field values. We found energy bursts each time the molecule undergoes a magnetization jump, confirming their quantum nature. A series of tests indicated that photons carry out the energy and that indeed these photons obey the elementary conditions for super-radiance.

Bulletin of the American Physical Society•Mar 20, 2009•0 citations

Quantum Dynamics of Molecular Nanomagnets in a Resonant Cavity and the Maser Effect

César Augusto Dartora, G. G. Cabrera

We study the dynamics of molecular nanomagnets through a fully quantum mechanical model describing high-spin and high-anisotropy magnetic molecules subjected to a time-dependent magnetic field along the quantization axis, which continuously inverts the population of spin states. Crystals of molecular nanomagnets placed inside a resonant cavity interact with a quantized electromagnetic field. Relaxation of excited states takes place by means of spin-photon interaction, allowing stimulated emission of radiation and creating a maser effect.

arXiv:cond-mat/0609205•Sep 8, 2006•0 citations

Field-dependent superradiant quantum phase transition of molecular magnets in microwave cavities

Dimitrije Stepanenko, Mircea Trif, Oleksandr Tsyplyatyev +1 more

Abstract We study a superradiant quantum phase transition in the model of triangular molecular magnets coupled to the electric component of a microwave cavity field. The transition occurs when the coupling strength exceeds a critical value, d c , which, in sharp contrast to the standard two-level emitters, can be tuned by an external magnetic field. In addition to emitted radiation, the molecules develop an in-plane electric dipole moment at the transition. We estimate that the transition can be detected in state-of-the-art microwave cavities if their electric field couples to a crystal containing a sufficient number of oriented molecules.

arXiv:1502.04075•Semiconductor Science and Technology•Aug 25, 2016•9 citations

Quantum jumps in atomic systems

P. Zoller, Monika A. M. Marte, Daniel F. Walls

We present a microscopic model for the so-called quantum jumps in three-level atoms with one transition between two levels being strongly driven and the third level being metastable. Our model is based on calculating the elementary probability density P(0,t)(t1, … , t n ) which gives the probability density that exactly n photons are emitted at times t1, … , t n by the atom in the time interval (0, t) on the strong transition. This enables us to calculate the conditional probabilities c ˜ ( τ ) that given a photon has emitted at τ = 0 the next photon emission occurs at time τ. This quantity is shown to be the sum of two exponentials which for sufficient differetial in the time scales describe the periods of light and darkness. Using this conditional probability it is possible to numerically simulate the individual photon emissions.

Annual Meeting Optical Society of America•Jan 1, 1986•5 citations

Quantum coherence in Fe 8 molecular nanomagnets

Enrique del Barco, N. Vernier, J. M. Hernández +4 more

We report observation of coherent quantum oscillations in spin-10 Fe 8 molecular clusters. The powder of magnetically oriented Fe 8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MHz, down to 25 mK. Two peaks in the imaginary part of the susceptibility have been detected, whose positions coincide, without any fitting parameters, with the predicted two peaks corresponding to the quantum splitting of the ground state in the magnetic field parallel and perpendicular to the hard magnetization axis.

arXiv:cond-mat/9810261•Europhysics Letters (EPL)•Sep 15, 1999•84 citations

Electromagnetic superradiance from single-molecule magnets in the presence of a classical driving magnetic field

Iosif Davidovich Tokman, Vera Il’inichna Pozdnyakova, G. A. Vugalter +1 more

The electromagnetic superradiance of a nanomagnet crystal (magnetic molecules) subjected to a resonant driving magnetic field and a dc magnetic field has been theoretically investigated. The driving magnetic field is supposed to be strong enough so that it essentially influences the spectrum of the magnetic molecules. The conditions favorable for observing the superradiance have been formulated.

Physical Review B•Mar 17, 2008•8 citations
Photons emitted by transition between the discrete levels of single molecular magnets might obey the elementary condition for Dicke's super-radiance. We investigate this possibility in the Fe8{\text{Fe}}_{8}Fe8​ molecule where magnetization jumps are known to occur at discrete magnetic-field values. We found energy bursts each time the molecule undergoes a magnetization jump, confirming their quantum nature. A series of tests indicated that photons carry out the energy and that indeed these photons obey the elementary conditions for super-radiance.
Electromagnetic radiation emanating from the molecular nanomagnet Fe8_{8}8​
Photons emitted by transition between the discrete levels of single molecular magnets might obey the elementary condition for Dicke’s super-radiance. We investigate this possibility in the Fe8 molecule where magnetization jumps are known to occur at discrete magnetic-field values. We found energy bursts each time the molecule undergoes a magnetization jump, confirming their quantum nature. A series of tests indicated that photons carry out the energy and that indeed these photons obey the elementary conditions for super-radiance.
We study the dynamics of molecular nanomagnets through a fully quantum mechanical model describing high-spin and high-anisotropy magnetic molecules subjected to a time-dependent magnetic field along the quantization axis, which continuously inverts the population of spin states. Crystals of molecular nanomagnets placed inside a resonant cavity interact with a quantized electromagnetic field. Relaxation of excited states takes place by means of spin-photon interaction, allowing stimulated emission of radiation and creating a maser effect.
Abstract We study a superradiant quantum phase transition in the model of triangular molecular magnets coupled to the electric component of a microwave cavity field. The transition occurs when the coupling strength exceeds a critical value, d c , which, in sharp contrast to the standard two-level emitters, can be tuned by an external magnetic field. In addition to emitted radiation, the molecules develop an in-plane electric dipole moment at the transition. We estimate that the transition can be detected in state-of-the-art microwave cavities if their electric field couples to a crystal containing a sufficient number of oriented molecules.
We present a microscopic model for the so-called quantum jumps in three-level atoms with one transition between two levels being strongly driven and the third level being metastable. Our model is based on calculating the elementary probability density P(0,t)(t1, … , t n ) which gives the probability density that exactly n photons are emitted at times t1, … , t n by the atom in the time interval (0, t) on the strong transition. This enables us to calculate the conditional probabilities c ˜ ( τ ) that given a photon has emitted at τ = 0 the next photon emission occurs at time τ. This quantity is shown to be the sum of two exponentials which for sufficient differetial in the time scales describe the periods of light and darkness. Using this conditional probability it is possible to numerically simulate the individual photon emissions.
We report observation of coherent quantum oscillations in spin-10 Fe 8 molecular clusters. The powder of magnetically oriented Fe 8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MHz, down to 25 mK. Two peaks in the imaginary part of the susceptibility have been detected, whose positions coincide, without any fitting parameters, with the predicted two peaks corresponding to the quantum splitting of the ground state in the magnetic field parallel and perpendicular to the hard magnetization axis.