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Featured researches published by B. Sahoo.


Science | 2010

Collective Lamb Shift in Single-Photon Superradiance

Ralf Röhlsberger; Kai Schlage; B. Sahoo; Sebastien Couet; R. Rüffer

All Together Now An atom, when excited, will typically decay with a characteristic decay time. An ensemble of atoms, collectively coupled together with just one of the atoms excited will conspire to decay much faster than the single atom case. This enhancement of light-matter interaction is known as superradiance. Röhlsberger et al. (p. 1248, published online 13 May; see the cover; see the Perspective by Scully and Svidzinsky) present the realization of an artificial superradiant system comprising resonant iron atoms embedded in a semiconductor cavity and excited by synchrotron radiation and report the signature collective Lamb shift expected from the cooperative interaction and enhanced decay rate. The availability of such a controlled system to look closer at this effect should shed light on its role in natural and complex light-harvesting systems, and possibly allow the production of more efficient solar cells. Superradiance is observed from an ensemble of iron atoms excited by synchrotron radiation. Superradiance, the cooperative spontaneous emission of photons from an ensemble of identical atoms, provides valuable insights into the many-body physics of photons and atoms. We show that an ensemble of resonant atoms embedded in the center of a planar cavity can be collectively excited by synchrotron radiation into a purely superradiant state. The collective coupling of the atoms via the radiation field leads to a substantial radiative shift of the transition energy, the collective Lamb shift. We simultaneously measured the temporal evolution of the superradiant decay and the collective Lamb shift of resonant 57Fe nuclei excited with 14.4–kilo–electron volt synchrotron radiation. Our experimental technique provides a simple method for spectroscopic analysis of the superradiant emission.


Nature | 2012

Electromagnetically induced transparency with resonant nuclei in a cavity

Ralf Röhlsberger; Hans-Christian Wille; Kai Schlage; B. Sahoo

The manipulation of light–matter interactions by quantum control of atomic levels has had a profound impact on optical sciences. Such manipulation has many applications, including nonlinear optics at the few-photon level, slow light, lasing without inversion and optical quantum information processing. The critical underlying technique is electromagnetically induced transparency, in which quantum interference between transitions in multilevel atoms renders an opaque medium transparent near an atomic resonance. With the advent of high-brilliance, accelerator-driven light sources such as storage rings or X-ray lasers, it has become attractive to extend the techniques of optical quantum control to the X-ray regime. Here we demonstrate electromagnetically induced transparency in the regime of hard X-rays, using the 14.4-kiloelectronvolt nuclear resonance of the Mössbauer isotope iron-57 (a two-level system). We exploit cooperative emission from ensembles of the nuclei, which are embedded in a low-finesse cavity and excited by synchrotron radiation. The spatial modulation of the photonic density of states in a cavity mode leads to the coexistence of superradiant and subradiant states of nuclei, respectively located at an antinode and a node of the cavity field. This scheme causes the nuclei to behave as effective three-level systems, with two degenerate levels in the excited state (one of which can be considered metastable). The radiative coupling of the nuclear ensembles by the cavity field establishes the atomic coherence necessary for the cancellation of resonant absorption. Because this technique does not require atomic systems with a metastable level, electromagnetically induced transparency and its applications can be transferred to the regime of nuclear resonances, establishing the field of nuclear quantum optics.


Chemical Communications | 2002

Synthesis, characterization and catalytic properties of trivalent iron substituted hexagonal mesoporous aluminophosphatesElectronic supplementary information (ESI) available: XRD patterns. See http://www.rsc.org/suppdata/cc/b2/b204215k/

S. K. Mohapatra; B. Sahoo; W. Keune; P. Selvam

Trivalent iron substituted hexagonal mesoporous aluminophosphate molecular sieve has been synthesized and characterized for the first time, which showed excellent catalytic activity and reusability for the cyclohexane oxidation reaction under mild conditions.


Journal of Physics: Condensed Matter | 2004

Atomic vibrational density of states in crystalline and amorphous Tb1-xFex alloy thin films studied by nuclear resonant inelastic x-ray scattering (NRIXS)

W. Keune; T Ruckert; B. Sahoo; Wolfgang Sturhahn; T. S. Toellner; E. E. Alp; Ralf Röhlsberger

Nuclear resonant inelastic x-ray scattering of 14.4125 keV synchrotron radiation was employed to measure directly the partial (Fe projected) vibrational density of states (VDOS), g(E), of vapour-quenched amorphous (a-)Tb 1-x 57Fe x thin film alloys (0.20 ≤ x ≤ 0.82) and epitaxial Tb 57 Fe 2 (110) thin films. A comparison of the VDOS measured at 300 and 10 K, respectively, demonstrates that the vibrational anharmonicity is small in these systems. The probability of recoilless absorption (f factor), the average kinetic energy per Fe atom and the average force constant were obtained. A plot of g(E)/E 2 versus E proves the existence of non-Debye-like vibrational excitations at excitation energies below about 10 meV for the amorphous alloys. At a constant film thickness of 17.5 nm, the probability of these excitations scales about linearly with the Tb concentration.


Journal of Physics D | 2002

Mössbauer effect study of the Fe spin structure in exchange-bias and exchange-spring systems

W. Keune; V. Kuncser; M. Doi; M. Askin; H. Spies; B. Sahoo; Eyup Duman; Mehmet Acet; Jingkun Jiang; A. Inomata; S. D. Bader

Theoretical and experimental issues connected with exchange-bias and exchange-spring behaviour are briefly reviewed, and the potential of conversion electron Mossbauer spectroscopy, including the 57Fe probe layer technique, to reveal the spin structure in layered systems is emphasized. First experimental results are reported for the new exchange-bias system FeSn2/Fe and for the exchange-spring system Sm–Co/Fe.


Phase Transitions | 2003

Superconductivity of MgB 2 Thin Films Prepared By CoEvaporation and Magnetism of MgB 2 /Fe Multilayers Studied By Mössbauer Spectroscopy

B. Sahoo; V. Kuncser; S. Kirsch; W. Keune

MgB 2 thin films and MgB 2 /Fe multilayers have been prepared by vapor deposition of the elements in vacuum. X-ray diffraction studies of the MgB 2 samples show preferred c -axis growth along the film normal direction. Superconducting transition temperatures of 18 K and 22 K have been measured before and after annealing, respectively, of an MgB 2 film of 1575 Å thickness. Atomic force microscope images show island growth of the films leading to a rough surface. Mössbauer spectroscopy on MgB 2 /Fe/MgB 2 multilayers of various Fe layer thicknesses indicates superparamagnetic behavior. Evidence is provided for the formation of interfacial amorphous (a-) Fe 3 B. The magnetic ordering of Fe and a-Fe 3 B and the size effect in MgB 2 are assumed to be the cause for the destruction of the superconductivity in the as-grown multilayers.


Physical Review A | 2017

Relativistic coupled-cluster-theory analysis of unusually large correlation effects in the determination of g(j) factors in Ca+

B. Sahoo; Pradeep Kumar

We investigate roles of electron correlation effects in the determination of the


INTERNATIONAL CONFERENCE ON MAGNETIC MATERIALS (ICMM-2010) | 2011

Preparation and Characterization of Ultrathin Stainless Steel Films

B. Sahoo; Kai Schlage; J. Major; U. von Hörsten; W. Keune; H. Wende; Ralf Röhlsberger

{g}_{j}


Phase Transitions | 2006

Electronic transport and atomic vibrational properties of semiconducting Mg Sn thin film

B. Sahoo; Waheed A. Adeagbo; Frank Stromberg; W. Keune; E. Schuster; R. Peters; Peter Entel; Stephan Lüttjohann; Wolfgang Sturhahn; Jiyong Zhao; T. S. Toellner; E. E. Alp

factors of the


Hyperfine Interactions | 2003

Atomic Vibrational Dynamics of Thin Films Studied by Nuclear Resonant Inelastic X-Ray Scattering: Amorphous Tb1−xFex Alloys

T. Ruckert; W. Keune; B. Sahoo; Wolfgang Sturhahn; T. S. Toellner; E. E. Alp; Ralf Röhlsberger

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W. Keune

University of Duisburg-Essen

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E. E. Alp

Argonne National Laboratory

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T. S. Toellner

Argonne National Laboratory

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Wolfgang Sturhahn

California Institute of Technology

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E. Schuster

University of Duisburg-Essen

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Jiyong Zhao

Argonne National Laboratory

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Frank Stromberg

University of Duisburg-Essen

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Mehmet Acet

University of Duisburg-Essen

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