Reversed time in Mössbauer time spectra

Shvyd’ko, Yu. V.; Hertrich, T.; Metge, J.; Leupold, O.; Gerdau, E.; Rüter, H. D.

doi:10.1103/physrevb.52.r711

Cited by 25 publications

(19 citation statements)

References 5 publications

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“…Although it is more difficult to deal with gamma radiation than with optical radiation [10], a few coherent effects for gamma rays have been predicted. Some of them have already been demonstrated, such as the photon echo via stepwise phase modulation of recoilless gamma radiation [11], Rabi flopping by microwave driving of hyperfine transitions [12,13], storage of nuclear excitation via magnetic switching [14], reversed time [15] and dynamical beating [16] in Mössbauer spectra, gamma-microwave double resonance [13,17,18], or gamma-optical double resonance [19]. Recently, interesting proposals have been discussed to obtain lasing for gamma rays by utilizing coherent effects [20][21][22][23].…”

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confidence: 99%

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

et al. 2002

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A significant reduction of absorption for single gamma photons has been experimentally observed by studying Mössbauer spectra of 57 Fe in a FeCO 3 crystal. The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole interaction. [16] in Mössbauer spectra, gamma-microwave double resonance [13,17,18], or gamma-optical double resonance [19]. Recently, interesting proposals have been discussed to obtain lasing for gamma rays by utilizing coherent effects [20][21][22][23]. In this Letter, we report on experiments demonstrating the EIT effect at the singlephoton level via the level (anti)crossing technique. A theory of the one-photon interaction with a nucleus has been developed to describe the experimental results. The obtained results open an interesting perspective to extend coherent effects to nuclear transitions. Figure 1 represents the main results of the paper. It shows the observed Mössbauer spectrum of a single crystal of FeCO 3 at a temperature of 30.5(5) K which corresponds to a magnetic hyperfine field of B 15:1 3 T. At this field the hyperfine levels jm 1=2i and jm ÿ3=2i anticross. For the transitions connected to the anticrossing levels, a deficit of absorption of 25% is observed at the peak velocity. It means that some transparency is induced by interference, similar to EIT observed in optics.The experiments were performed by using a conventional Mössbauer setup. It includes a source of gamma radiation ( 57 CoRh), an absorber of FeCO 3 cleaved on the f1014g faces (optical thickness is of the order 10), and a detector. The absorber was mounted on a target holder which allows for a precise temperature control at the target position in the interval 4-600 K. Besides the magnetic hyperfine field, the Fe 2 nucleus in the FeCO 3 crystal [24,25] is subjected to a large axially symmetric electric field gradient (EFG) which results in a well-resolved quadrupole doublet. The level structures of the source and the absorber are shown in Fig. 2. In a magnetic field, the levels might shift to the position where their energies coincide; this situation is referred to as level crossing. But due to the presence of additional fields, the energies of levels might never be equal, and it is the case of level anticrossing.If the magnetic field is collinear with the EFG axis, the axial symmetry is preserved and the m states are eigenfunctions of the total nuclear Hamiltonian if the z axis is chosen along the symmetry axis. However, in such a mineral containing impurities and defects, one can expect a small distribution of fields which are responsible for the

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confidence: 99%

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

et al. 2002

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“…4.10 (b), the phase of the released photonic wave packet will be modulated with a shift of π. This is caused by the effect of reversed time related with the change of sign of the hyperfine magnetic field [141,142], i.e., all the nuclear currents evolve backwards in time. However, since the phase of a single photon is totally undefined, a method for measuring the magnetically modulated π phase shift is to be addressed.…”

Section: Resultsmentioning

confidence: 99%

“…We emphasize that photon storage is not necessary for phase modulation, since the echo effect clearly shows that the phase control is only achieved via the manipulation of nuclear dynamics, i.e., the time reversal effect [141,142]. It becomes apparent that without turning off the hyperfine magnetic fields the magnetically induced nuclear exciton echo itself also provides a simple way of photon storage: inverse magnetic fields in target 1 and 2 result in a significant suppression of the scattered x-ray light.…”

Section: Hard X-ray Interferometer and The Phase Of A Single Photon Wmentioning

confidence: 99%

Coherent Control of Nuclei and X-Rays

Liao

2014

Springer Theses

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The possibility of mutual control of nuclei and photons offered by the emerging field of nuclear quantum optics is theoretically investigated in three different applications. This extension of quantum optics towards nuclei is motivated by modern X-ray Free Electron Lasers (XFEL) which open the possibility to coherently control nuclear states. As a first application we investigate the coherent population transfer between nuclear states in a three-level system driven by an XFEL. Such a level scheme is relevant for the triggering of isomers and might play a role for future energy storage solutions. The other way around, nuclei offer a platform to control single x-ray photons, which can be focused on spots essentially smaller than a single atom and used in future photonic circuits. The second part of this thesis puts forward a nuclear forward scattering setup that allows coherent control of a single x-ray photon using 57 Fe nuclei. Finally, we show that nuclear quantum optics provides a significant improvement for detection in nuclear physics. The low-lying isomeric transition of 229 Th can be addressed by VUV lasers and provides a potential next generation frequency standard. A main impediment is the large uncertainty of the nuclear transition frequency. Using an electromagnetically modified nuclear forward scattering setup, we show that coherence effects can reduce this uncertainty down to an unprecedented level.Within the framework of this thesis, the following articles were published in refereed journals:

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“…Experiments with switched magnetic fields to manipulate the nuclear-resonant properties of a sample have been done [36][37][38], but in a different context, and using samples that were optically thick in the absorption process. In the first of these [36,37], a sublevel of the 57 Fe excited state in a sample of FeBO 3 was populated selectively through an appropriate velocity of the sample relative to a 57 Co source.…”

Section: Active Switching Of the Optical Thicknessmentioning

confidence: 99%

Nuclear γ-ray superradiance

Adams

2009

Journal of Modern Optics

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Nuclear -ray-resonant superradiance is discussed, comparing Dicke's original approach [1] and recent extensions [2,3] of Scully et al. [2][3][4][5] involving conditional excitation to the classical resonant-scattering [6-10] and the Hannon-Trammell [11-14] quantum theories. Relevant questions are whether the sample is optically thin or thick in the excitation and re-radiation processes, the role of superpositions between ground and excited states, Fermi's golden rule, and decoherence due to spatially-dependent near-field interactions [15][16][17]. The relation of these considerations to experimental results is discussed.

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Reversed time in Mössbauer time spectra

Cited by 25 publications

References 5 publications

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

Controlling Absorption of Gamma Radiation via Nuclear Level Anticrossing

Coherent Control of Nuclei and X-Rays

Nuclear γ-ray superradiance

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