Steering ultrafast electron dynamics with well-controlled laser fields is very important for generation of intense supercontinuum radiation.It can be achieved through coherent control of the symmetry of the interactio...Steering ultrafast electron dynamics with well-controlled laser fields is very important for generation of intense supercontinuum radiation.It can be achieved through coherent control of the symmetry of the interaction between strong-field laser fields and a metal nanotip.We employ a scheme of two-color laser pulses combined with a weak static field to realize the control of a single quantum path to generate high harmonic generation from a single solid-state nanoemitter.Moreover,a smooth and ultrabroad supercontinuum in the extreme ultraviolet region is obtained,which can produce a single attosecond pulse.Our findings are beneficial for efficient generation of isolated sub-100 as XUV pulses from solid-state sources.展开更多
High harmonic generation(HHG)from solids shows great application prospects in compact short-wavelength light sources and as a tool for imaging the dynamics in crystals with subnanometer spatial and attosecond temporal...High harmonic generation(HHG)from solids shows great application prospects in compact short-wavelength light sources and as a tool for imaging the dynamics in crystals with subnanometer spatial and attosecond temporal resolution.However,the underlying collision dynamics behind solid HHG is still intensively debated and no direct mapping relationship between the collision dynamics with band structure has been built.Here,we show that the electron and its associated hole can be elastically scattered by neighboring atoms when their wavelength approaches the atomic size.We reveal that the elastic scattering of electron/hole from neighboring atoms can dramatically influence the electron recombination with its left-behind hole,which turns out to be the fundamental reason for the anisotropic interband HHG observed recently in bulk crystals.Our findings link the electron/hole backward scattering with Van Hove singularities and forward scattering with critical lines in the band structure and thus build a clear mapping between the band structure and the harmonic spectrum.Our work provides a unifying picture for several seemingly unrelated experimental observations and theoretical predictions,including the anisotropic harmonic emission in MgO,the atomic-like recollision mechanism of solid HHG,and the delocalization of HHG in ZnO.This strongly improved understanding will pave the way for controlling the solid-state HHG and visualizing the structure-dependent electron dynamics in solids.展开更多
基金Supported by the National Key Research and Development Program of China(Grant Nos.2019YFA0307700 and 2016YFA0401100)the National Natural Science Foundation of China(Grant Nos.11774215,11674209,91950101,11947243,11334009,11425414,and11947080)+3 种基金Sino-German Mobility Programme(Grant No.M-0031)Department of Education of Guangdong Province(Grant No.2018KCXTD011)High Level University Projects of the Guangdong Province(Mathematics,Shantou University)the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM)。
文摘Steering ultrafast electron dynamics with well-controlled laser fields is very important for generation of intense supercontinuum radiation.It can be achieved through coherent control of the symmetry of the interaction between strong-field laser fields and a metal nanotip.We employ a scheme of two-color laser pulses combined with a weak static field to realize the control of a single quantum path to generate high harmonic generation from a single solid-state nanoemitter.Moreover,a smooth and ultrabroad supercontinuum in the extreme ultraviolet region is obtained,which can produce a single attosecond pulse.Our findings are beneficial for efficient generation of isolated sub-100 as XUV pulses from solid-state sources.
基金supported by the National Natural Science Foundation of China(Grant No.12074240,No.91950101,and No.11774215)the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)(project number 231447078 TRR 142)(project A07)+2 种基金the Sino-German Mobility Programme(Grant No.M-0031)the Department of Education of Guangdong Prov-ince(Grant No.2018KCXTD011)the Open Fund of the State Key Laboratory of High Field Laser Physics(SIOM).
文摘High harmonic generation(HHG)from solids shows great application prospects in compact short-wavelength light sources and as a tool for imaging the dynamics in crystals with subnanometer spatial and attosecond temporal resolution.However,the underlying collision dynamics behind solid HHG is still intensively debated and no direct mapping relationship between the collision dynamics with band structure has been built.Here,we show that the electron and its associated hole can be elastically scattered by neighboring atoms when their wavelength approaches the atomic size.We reveal that the elastic scattering of electron/hole from neighboring atoms can dramatically influence the electron recombination with its left-behind hole,which turns out to be the fundamental reason for the anisotropic interband HHG observed recently in bulk crystals.Our findings link the electron/hole backward scattering with Van Hove singularities and forward scattering with critical lines in the band structure and thus build a clear mapping between the band structure and the harmonic spectrum.Our work provides a unifying picture for several seemingly unrelated experimental observations and theoretical predictions,including the anisotropic harmonic emission in MgO,the atomic-like recollision mechanism of solid HHG,and the delocalization of HHG in ZnO.This strongly improved understanding will pave the way for controlling the solid-state HHG and visualizing the structure-dependent electron dynamics in solids.
