High harmonic generation in crystal SiO_(2) by sub-10-fs laser pulses

The high harmonic generation(HHG)by few-cycle laser pulses is essential for research in strong-field solid-state physics.Through comparison of high harmonic spectra of solids generated by laser pulses with varying durations,we discovered that lasers with good dispersion compensation are capable of producing a broad spectrum of high harmonics.As the pulse duration is further compressed,several interference peaks appear in the broad spectrum.Moreover,we conducted simulations using the semiconductor Bloch equation,considering the effect of Berry curvature,to better understand this process.Our work provides a valuable approach for studying HHG by few-cycle laser pulses in solid materials,expanding the application of HHG in attosecond physics.

Role of a high ground-state centrifugal barrier in the breakup of the ^(31)Ne nucleus

An analysis of the breakup of the 31 Ne weakly-bound neutron-halo system on a lead target is presented,considering the 2p_(3/2) and 1f_(7/2) ground-state configurations.It is shown that a high centrifugal barrier almost wipes out the breakup channel,thus assimilating the breakup of a weakly-bound system to that of a tightly-bound system,and also reduces the range of the monopole nuclear potential.Consequently,a high centrifugal barrier prevents the suppression of the Coulomb-nuclear interference(CNI) peak by weakening couplings to the breakup channel and reducing the range of the monopole nuclear potential,two main factors that would otherwise suppress such a peak.The present study also identifies couplings to the breakup channel and a long-ranged monopole nuclear potential as the main factors that lead to the suppression of the CNI peak.A low centrifugal barrier together with a Coulomb barrier would also effectively prevent the suppression of the CNI peak in proton-halos as reported in the case of the 8B proton-halo.