Hydrogen Molecule in the Small Dodecahedral Cage of a Clathrate Hydrate:  Quantum Translation−Rotation Dynamics at Higher Excitation Energies†

2007 ◽  
Vol 111 (49) ◽  
pp. 12763-12771 ◽  
Author(s):  
Minzhong Xu ◽  
Francesco Sebastianelli ◽  
Zlatko Bačić
Keyword(s):  
Hydrogen Molecule ◽  
Clathrate Hydrate ◽  
Excitation Energies ◽  
Rotation Dynamics

Hydrogen Molecule in the Small Dodecahedral Cage of a Clathrate Hydrate:  Quantum Five-Dimensional Calculations of the Coupled Translation−Rotation Eigenstates

2006 ◽  
Vol 110 (49) ◽  
pp. 24806-24811 ◽  
Author(s):  
Minzhong Xu ◽  
Yael S. Elmatad ◽  
Francesco Sebastianelli ◽  
Jules W. Moskowitz ◽  
Zlatko Bačić
Keyword(s):  
Hydrogen Molecule ◽  
Clathrate Hydrate

Hydrogen Molecules in the Small Dodecahedral Cage of a Clathrate Hydrate:  Quantum Translation−Rotation Dynamics of the Confined Molecules

2007 ◽  
Vol 111 (6) ◽  
pp. 2497-2504 ◽  
Author(s):  
Francesco Sebastianelli ◽  
Minzhong Xu ◽  
Yael S. Elmatad ◽  
Jules W. Moskowitz ◽  
Zlatko Bačić
Keyword(s):  
Clathrate Hydrate ◽  
Hydrogen Molecules ◽  
Rotation Dynamics

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

scholarly journals Observation of chiral surface excitons in a topological insulator Bi2Se3

2019 ◽  
Vol 116 (10) ◽  
pp. 4006-4011 ◽  
Author(s):  
H.-H. Kung ◽  
A. P. Goyal ◽  
D. L. Maslov ◽  
X. Wang ◽  
A. Lee ◽  
...  
Keyword(s):  
Polarized Light ◽  
Orbit Coupling ◽  
Experimental Investigations ◽  
Composite Particles ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Excitation Energies ◽  
Circularly Polarized Light ◽  
Pl Emission ◽  
Strong Spin

The protected electron states at the boundaries or on the surfaces of topological insulators (TIs) have been the subject of intense theoretical and experimental investigations. Such states are enforced by very strong spin–orbit interaction in solids composed of heavy elements. Here, we study the composite particles—chiral excitons—formed by the Coulomb attraction between electrons and holes residing on the surface of an archetypical 3D TI,Bi2Se3. Photoluminescence (PL) emission arising due to recombination of excitons in conventional semiconductors is usually unpolarized because of scattering by phonons and other degrees of freedom during exciton thermalization. On the contrary, we observe almost perfectly polarization-preserving PL emission from chiral excitons. We demonstrate that the chiral excitons can be optically oriented with circularly polarized light in a broad range of excitation energies, even when the latter deviate from the (apparent) optical band gap by hundreds of millielectronvolts, and that the orientation remains preserved even at room temperature. Based on the dependences of the PL spectra on the energy and polarization of incident photons, we propose that chiral excitons are made from massive holes and massless (Dirac) electrons, both with chiral spin textures enforced by strong spin–orbit coupling. A theoretical model based on this proposal describes quantitatively the experimental observations. The optical orientation of composite particles, the chiral excitons, emerges as a general result of strong spin–orbit coupling in a 2D electron system. Our findings can potentially expand applications of TIs in photonics and optoelectronics.

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