The Experts below are selected from a list of 32622 Experts worldwide ranked by ideXlab platform
Hm Sofia - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of the spreading width of the particle-hole giant resonances.
Physical review. C Nuclear physics, 1994Co-Authors: Gg Dussel, Ec Seva, Hm SofiaAbstract:We evaluate the spreading width of the giant resonances using the discontinuity in the second derivative of the propagator of the vibrational Phonon. This allows us to isolate the processes that contribute to the spreading width in terms of the Feynman diagrammatic expansion of the full boson propagator. Utilizing for classification purposes the nuclear field theory perturbative treatment of the one-Phonon State, we obtain a very simple expression for the spreading width in the lowest (nonvanishing) order of perturbation theory.
Gui-lu Long - One of the best experts on this subject based on the ideXlab platform.
-
Quantum memory and non-demolition measurement of single Phonon State with nitrogen-vacancy centers ensemble.
Optics express, 2017Co-Authors: Rui-xia Wang, Kang Cai, Zhang-qi Yin, Gui-lu LongAbstract:In a diamond, the mechanical vibration-induced strain can lead to interaction between the mechanical mode and the nitrogen-vacancy (NV) centers. In this work, we propose to utilize the strain-induced coupling for the quantum non-demolition (QND) single Phonon measurement and memory in a diamond. The single Phonon in a diamond mechanical resonator can be perfectly absorbed and emitted by the NV centers ensemble (NVE) with adiabatically tuning the microwave driving. An optical laser drives the NVE to the excited States, which have much larger coupling strength to the mechanical mode. By adiabatically eliminating the excited States under large detuning limit, the effective coupling between the mechanical mode and the NVE can be used for QND measurement of the single Phonon State. Under realistic experimental conditions, we numerically simulate the scheme. It is found that the fidelity of the absorbing and emitting process can reach a much high value. The overlap between the input and the output Phonon shapes can reach 98.57%.
-
Quantum non-demolition measurement of single Phonon State with nitrogen-vacancy centers ensemble and superconducting qubit
arXiv: Quantum Physics, 2017Co-Authors: Rui-xia Wang, Kang Cai, Zhang-qi Yin, Gui-lu LongAbstract:We propose a scheme to realize the quantum non-demolition single Phonon detection and emission based on the interaction between the NV ensemble and the superconducting flux qubit. The resonant frequency of the flux qubit will change with the NVE absorbing a single Phonon, then we can detect the single Phonon State through measuring the frequency shift of the flux qubit. The fidelity of the absorbing process can reach a much high value. After the detection process, the NVE can emit the absorbed Phonon as we apply a driving pulse which is in reverse to the absorbing process. The overlap between the input and the output Phonon shapes can reach $98.57\%$. The scheme can be realized under the realistic experimental condition.
Konstantin K. Pukhov - One of the best experts on this subject based on the ideXlab platform.
-
Coherent-Phonon vibronic sideband
Journal of Luminescence, 2006Co-Authors: J. Heber, Konstantin K. PukhovAbstract:Abstract We present the theory of vibronic sideband spectra due to coherent Phonon modes using the conventional model of linear electron–Phonon coupling and displaced equilibrium positions of the oscillators in the exited and final electronic States. Unlike in the conventional theory the initial State of the oscillator is taken as a coherent Phonon State and not as a thermalized one. Under these conditions we got an exact analytical solution for the lineshape of the vibronic sideband. The sideband is determined by two parameters, the Huang–Rhys parameter S and the coherence parameter α of the Phonon State. For α=0 the lineshape converts into the standard Pekarian form for T=0.
-
Vibronic Sidebands of Coherent Phonon States
Radiation Effects and Defects in Solids, 2003Co-Authors: J. Heber, Konstantin K. PukhovAbstract:Recently experiments have been reported about Phonon sidebands in doped crystals, which may originate from coherent Phonon States. The corresponding modes are either confined Phonon modes in nanocrystals or localized Phonon modes in bulk materials, both showing small damping due to Phonon-Phonon interaction. We present a theory of the lineshape of vibronic sideband spectra due to coherent Phonon States using the conventional model of linear electron-Phonon coupling and displaced equilibrium positions of the oscillators in the initial and final electronic States. Unlike in the conventional theory, the initial State of the oscillator is taken as a coherent Phonon State and not as a thermalized one. Under these conditions we got an exact analytical solution for the lineshape of the vibronic sideband. The lineshape is determined by two parameters, the Huang-Rhys parameter S and the coherence parameter α of the Phonon State. For α = 0 the lineshape converts into the standard Pekarian form for T = 0.
V.v. Voronov - One of the best experts on this subject based on the ideXlab platform.
-
On double resonances in spherical nuclei
Physics Letters B, 1992Co-Authors: V. Yu. Ponomarev, V.v. VoronovAbstract:Abstract Double giant resonances in spherical nuclei formed by the low-lying collective one-Phonon State and giant resonance as well as of two giant resonances are analyzed within the quasiparticle Phonon model. The position, photoexcitation probability and the width of these resonances of low multipolarity are calculated in 208Pb.
Gg Dussel - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of the spreading width of the particle-hole giant resonances.
Physical review. C Nuclear physics, 1994Co-Authors: Gg Dussel, Ec Seva, Hm SofiaAbstract:We evaluate the spreading width of the giant resonances using the discontinuity in the second derivative of the propagator of the vibrational Phonon. This allows us to isolate the processes that contribute to the spreading width in terms of the Feynman diagrammatic expansion of the full boson propagator. Utilizing for classification purposes the nuclear field theory perturbative treatment of the one-Phonon State, we obtain a very simple expression for the spreading width in the lowest (nonvanishing) order of perturbation theory.