Phase Slips,Dislocations, Half-Integer Vortices,Two-Fluid Hydrodynamics,and the Chiral Anomaly in Charge and Spin Density Waves

Journal of Experimental and Theoretical Physics - This brief review recalls some chapters in theory of sliding incommensurate density waves which may have appeared after inspirations from studies...     

Simulation of the Glass Transition of a Thin Aluminum Melt Layer at Ultrafast Cooling under Isobaric Conditions

JETP Letters - It is shown that a sharp increase in viscosity, a change in the decay rate of correlations, and the appearance of nonequilibrium and transverse sound in a thin film of aluminum melt...     

Isotopic hydrogen exchange in 1- and 2-aryl-5-methyltetrazoles

The rate constants for basic deuterium exchange of the methyl group (k_D) in 2-phenyl-5-methyl-tetrazole (I) and 1-aryl-5-methyltetrazole (II) and its derivatives with a polar substituent (R) in the phenyl ring were measured. The increased CH acidity of II as compared with I [k_D(II)/k_D(I)20] is in agreement with the calculated and experimental values regarding the character of the electron-density distribution in the molecules. The effect of R on the rate of deuterium exchange of the methyl group correlates with the ° constants (=3.0, r = 0.997). The results of measurement of the kinetic isotope effect during deuterium (tritium) exchange in II (k_D/k_T1.8) are discussed in connection with the peculiarities of the stepwise reaction mechanism.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No.1, pp. 127–130, January, 1978.     

Quantum control of the spin-orbit interaction using the Autler-Townes effect

We have demonstrated quantum control of the spin-orbit interaction based on the Autler-Townes (ac-Stark) effect in a molecular system using a cw optical field. We show that the enhancement of the spin-orbit interaction between a pair of weakly interacting singlet-triplet rovibrational levels, G?(1)Π(g)(v=12,J=21,f)-1?(3)Σ(g)(-)(v=1,N=21,f), separated by 750 MHz in the lithium dimer, depends on the Rabi frequency (laser power) of the control laser. The increase in the spin-orbit interaction due to the control field is observed as a change in the spin character of the individual components of the perturbed pair.     

Diffusion rate in diamond growth

Conclusions Equations were established that relate the growth rate of diamond crystals in the region of its thermodynamic stability to the synthesis time.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2647–2649, November, 1978.     

Multi-Fluid Hydrodynamics in Charge Density Waves with Collective,Electronic, and Solitonic Densities and Currents

Journal of Experimental and Theoretical Physics - We present a general scheme to approach the space-time evolution of deformations, currents, and the electric field in charge density waves related...     

Charge density excitations in bilayer graphene in high magnetic field

The charge-density excitations in bilayer graphene at the filling-factor ν 1 at small momenta are considered in the frame of the Hartree-Fock approximation. The presence of small asymmetry of graphene layers is included. The dependence of the magnetoplasmon energy on the bilayer ground state is shown. The energy splitting proportional to $ \sqrt H $ for the symmetric case with half-filled zero-energy levels is found both for bilayer and monolayer graphene.     

Pinning and depinning process of an incommensurate CDW as revealed by coherent X-ray diffraction

Experiments on the coherent X-ray diffraction, and their modeling, have been performed on the Charge Density Wave (CDW) system NbSe₃. The 2k_F$2k_F$ satellite reflection associated with the CDW has been measured with respect to external dc currents. Below the threshold current, reflection displays several fringes in the transverse direction which disappear when the threshold current is exceeded. In the sliding state, the transverse satellite profile has a form of two nonsymmetric peaks, one of them being centered at the same position as below the threshold and another one being shifted. The shift of the longitudinal peak position below the threshold current and the nonsymmetric peak in the transverse direction above the threshold one is interpreted as the influence of strong linear defect like a crystal step present on the sample surface, combined with induced arrays of dislocations. Coherent X-rays provide a new access to processes in a CDW driven by an external force in a random pinning potential.