A method is described which allows the detection of atomic quantum beats or wave-packet evolution in low-lying states, phenomena which are usually difficult to observe. The excitation method consists of a phase-sensitive two-pulse technique. Detection of the excited-state population after the two pulses is achieved by monitoring rubidium dimer ions which are formed in the associative ionization reaction, Rb*(n)p+Rb \ensuremath{\rightarrow} ${\mathrm{Rb}}_{2}^{+}$ +${\mathit{e}}^{\mathrm{\ensuremath{-}}}$. The dimer ion yield as a function of the wavelength showed strong features, which coincided with the 8p to 15p atomic resonances. The two-pulse technique revealed atomic fine-structure quantum beats due to the coherent excitation of the ${\mathit{np}}^{2}$ ${\mathit{P}}_{1/2,3/2}$ fine-structure states of the atom. \textcopyright{} 1996 The American Physical Society.A method is described which allows the detection of atomic quantum beats or wave-packet evolution in low-lying states, phenomena which are usually difficult to observe. The excitation method consists of a phase-sensitive two-pulse technique. Detection of the excited-state population after the two pulses is achieved by monitoring rubidium dimer ions which are formed in the associative ionization reaction, Rb*(n)p+Rb \ensuremath{\rightarrow}${\mathrm{Rb}}_{2}^{+}$+${\mathit{e}}^{\mathrm{\ensuremath{-}}}$. The dimer ion yield as a function of the wavelength showed strong features, which coincided with the 8p to 15p atomic resonances. The two-pulse technique revealed atomic fine-structure quantum beats due to the coherent excitation of the ${\mathit{np}}^{2}$${\mathit{P}}_{1/2,3/2}$ fine-structure states of the atom. \textcopyright{} 1996 The American Physical Society.

Physical Review AMar 1, 199615 citations

Nonlinear excitations in a quantum dimer

Lisa J. Bernstein

Springer eBooksApr 7, 20080 citations

Multicolored quantum dimer models, resonating valence-bond states, color visons, and the triangular-lattice t2g spin-orbital system

Bruce Normand

The spin-orbital model for triply degenerate ${t}_{2g}$ electrons on a triangular lattice has been shown to be dominated by dimers. The phase diagram contains both strongly resonating, compound spin-orbital dimer states and quasistatic, spin-singlet valence-bond (VB) states. To elucidate the nature of the true ground state in these different regimes, the model is mapped to a number of quantum dimer models (QDMs), each of which has three dimer colors. The generic multicolored QDM, illustrated for the two- and three-color cases, possesses a topological color structure, ``color vison'' excitations, and broad regions of resonating VB phases. The specific models are analyzed to gain further insight into the likely ground states in the superexchange and direct-exchange limits of the electronic Hamiltonian, and they suggest a strong tendency toward VB order in all cases.The spin-orbital model for triply degenerate ${t}_{2g}$ electrons on a triangular lattice has been shown to be dominated by dimers. The phase diagram contains both strongly resonating, compound spin-orbital dimer states and quasistatic, spin-singlet valence-bond (VB) states. To elucidate the nature of the true ground state in these different regimes, the model is mapped to a number of quantum dimer models (QDMs), each of which has three dimer colors. The generic multicolored QDM, illustrated for the two- and three-color cases, possesses a topological color structure, ``color vison'' excitations, and broad regions of resonating VB phases. The specific models are analyzed to gain further insight into the likely ground states in the superexchange and direct-exchange limits of the electronic Hamiltonian, and they suggest a strong tendency toward VB order in all cases.

arXiv:1009.5140Physical Review BFeb 17, 201122 citations

Nonlinear resonance in quantum systems

Edward Shuryak

Journal of Experimental and Theoretical PhysicsDec 1, 197614 citations

Theory of quantum nonlinear resonance

G. P. Berman, G. M. Zaslavsky

Physics Letters AMay 1, 1977113 citations

{\mathrm{Rb}}_{2}^{+}

+${\mathit{e}}^{\mathrm{\ensuremath{-}}}$. The dimer ion yield as a function of the wavelength showed strong features, which coincided with the 8p to 15p atomic resonances. The two-pulse technique revealed atomic fine-structure quantum beats due to the coherent excitation of the

{\mathit{np}}^{2}

{\mathit{P}}_{1/2,3/2}

fine-structure states of the atom. \textcopyright{} 1996 The American Physical Society.

The spin-orbital model for triply degenerate

{t}_{2g}

electrons on a triangular lattice has been shown to be dominated by dimers. The phase diagram contains both strongly resonating, compound spin-orbital dimer states and quasistatic, spin-singlet valence-bond (VB) states. To elucidate the nature of the true ground state in these different regimes, the model is mapped to a number of quantum dimer models (QDMs), each of which has three dimer colors. The generic multicolored QDM, illustrated for the two- and three-color cases, possesses a topological color structure, ``color vison'' excitations, and broad regions of resonating VB phases. The specific models are analyzed to gain further insight into the likely ground states in the superexchange and direct-exchange limits of the electronic Hamiltonian, and they suggest a strong tendency toward VB order in all cases.