Yuzhu Jiang

Femtosecond laser filamentation with a 4 J/60 fs Ti:Sapphire laser beam: Multiple filaments and intensity clamping

We used both the backscattered nitrogen fluorescence signal (BSF) and ICCD fluorescence side imaging methods to study the filament light intensity with a 4 J/60 fs Ti:sapphire laser beam. It has been concluded that even the laser power is increased by 100 times in our experiment the peak laser intensity in the filament only has a little change. We attribute this phenomenon to the result of intensity clamping and the competition of multiple filaments.

Selective adsorption of metal-phthalocyanine on Au(111) surface with hydrogen atoms

Metal phthalocyanine (MPc, Mu2009=u2009Mn, Fe) molecules grown on reconstructed Au(111) with and without hydrogen atoms at submonolayer coverage are investigated by low temperature scanning tunneling microscopy. It is found out that the attachment of H atoms to the central metal of the MnPc molecules leads to the change of the molecules’ selective adsorption from fcc to hcp regions at low coverage. The two configurations of MnPc molecules on Au(111) are replaced by only one configuration of H-MnPc/Au(111). FePc molecules adsorb on fcc regions of Au(111) with two configurations, which are similar to that of MnPc. However, unlike H-MnPc, H-FePc molecules have two configurations on Au(111). Density function theory calculations show that the different configuration change by attachment of H atoms for MnPc and FePc molecules is due to the electronic structure change at the central metal atoms of the molecules.

Quantum criticality of spinons

The free fermion nature of interacting spins in one dimensional (1D) spin chains still lacks a rigorous study. In this letter we show that the length-

Hidden Sp(2s + 1)- or SO(2s + 1)-symmetry and new exactly solvable models in ultracold atomic systems

1

Asymptotic correlation functions and FFLO signature for the one-dimensional attractive Hubbard model

spin strings significantly dominate critical properties of spinons, magnons and free fermions in the 1D antiferromagnetic spin-1/2 chain. Using the Bethe ansatz solution we analytically calculate exact scaling functions of thermal and magnetic properties of the model, providing a rigorous understanding of the quantum criticality of spinons. It turns out that the double peaks in specific heat elegantly mark two crossover temperatures fanning out from the critical point, indicating three quantum phases: the Tomonaga-Luttinger liquid (TLL), quantum critical and fully polarized ferromagnetic phases. For the TLL phase, the Wilson ratio

Itinerant ferromagnetism in one-dimensional two-component Fermi gases

R_W=4K_s

Exotic pairing in 1D spin-3/2 atomic gases with SO(4) symmetry

remains almost temperature-independent, here

Universal low-energy physics in 1D strongly repulsive multi-component Fermi gases

K_s

Quantum criticality of one-dimensional multicomponent Fermi gas with strongly attractive interaction

is the Luttinger parameter. Furthermore, applying our results we precisely determine the quantum scalings and critical exponents of all magnetic properties in the ideal 1D spin-1/2 antiferromagnet Cu(C

Low-temperature properties of an integrable spin-3/ 2 gas with weak external magnetic field

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