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We compare the spectra of the new π operator of the SO(5) theory and the conventional Δ operator for the two-dimensional t – J model. We also calculate the weight transferred to the two-hole ground state from half-filling by these operators. We find that the spectra of these operators are...
The energy-averaged electron–ion (e–i) momentum transport cross-section has been derived analytically and computed numerically. The result shows inaccuracy of the computations and fitting formula given by other authors.
We study a 1D spin chain with alternating next-nearest-neighbour coupling. The plateau–nonplateau transition is expected to be of Berezinski–Kosterlitz–Thouless type from the bosonization result at k F = π /4. With the recently developed method, level spectroscopy, we obtain the transition...
To test a possible relation between topological entropy and Arnold complexity, and to provide a nontrivial examples of rational dynamical zeta functions, we introduce a two-parameter family of discrete birational mappings of two complex variables. We conjecture rational expressions with integer...
With or without an inserted quantum dot or an attached side resonator, the transmission behavior of an Aharonov–Bohm (AB) ring is investigated in the framework of quantum waveguide theory in the complex-energy plane. The calculated results show that the AB ring possesses antiresonances in the...
A gauge invariant canonical generator for the scale transformation of the quantized Schrödinger field is proposed on the basis of the gauge invariance of the virial theorem.
We present a tight-binding approach of the soliton formations and propagations in superlattices. Negative differential conductivity in superlattices leads to the growth of the inevitable spatial fluctuations and formation of the electron accumulation-layer domain. Based on the negative...
Liquid–solid phase transitions in colloidal plasmas are studied within the Yukawa model with nonlinearly screened effective potentials. It is shown, that there is a minimal charge asymmetry needed for the crystallization of a Coulomb lattice and its value depends on the packing fraction of the...
The controversial pinning dependence of the Hall conductivity ( σ xy ) is studied in the vortex-liquid phase of high- T c superconducting thin films. A strong pinning dependence of σ xy is found to be triggered by a crossover from a regular liquid to the glassy liquid (GL) where vortices remain...
We have performed the first measurement of charge exchange in keV C 60 + ion collisions with Na atoms in their 3s ground state as well as in the laser-excited and aligned 3p state. To interpret the results, we have calculated the correlation diagram of the C 60 + –Na collision system using the...
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