In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy(ARPES),a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigat...In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy(ARPES),a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method.It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions.The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations.The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.展开更多
The channeling phenomenon of carbon ions in single-wall carbon nanotubes (SWCNTs) is investigated by using the molecular dynamics simulation with analytical potentials.The relationship between the channeling critical ...The channeling phenomenon of carbon ions in single-wall carbon nanotubes (SWCNTs) is investigated by using the molecular dynamics simulation with analytical potentials.The relationship between the channeling critical angles in the SWCNT and the bonding interaction is analyzed.It was found that,at 200-5000 eV and 10°-20° of incident angle,the ions with the bonding interaction or chemical effect,have decreased dechanneling probabilities and increased critical angles,compared to that of non-bonding ions.So the bonding effect cannot be ignored in the channeling mechanism of carbon ions through a SWCNT.展开更多
Channeling phenomena of He,Ne,Ar and Kr ions at energy(200–5000 eV)in single-wall carbon nanotubes(SWCNTs)are investigated by molecular dynamics simulation with analytical potentials.The critical angles for the parti...Channeling phenomena of He,Ne,Ar and Kr ions at energy(200–5000 eV)in single-wall carbon nanotubes(SWCNTs)are investigated by molecular dynamics simulation with analytical potentials.The critical angles for the particles to be channeled in an SWCNT are analyzed.In the incident energy range of 200–5000 eV,it is found that the ion energy dependence of the critical angle obeys an improved Lindhard equation which is closely related to the ratio of nuclear charge number to atomic mass Z/M.The critical angle for different types of ions channeling in SWCNTs is determined by both the atomic nuclear charge and mass.展开更多
基金Supported by National Basic Research Program of China Grant No.2010CB934504National Natural Science Foundation of China Grant Nos.10874197, 10905040the CAS Hundred Talents Program
文摘In order to understand the effects of electron-phonon coupling and Coulomb interactions in angle-resolved photoemission spectroscopy(ARPES),a spin-1/2 Hubbard-Holstein model at half-filling is theoretically investigated by means of the mean field theory and classical Monte Carlo simulation method.It shows that the spectral shape of the one-dimensional system is significantly modified by the electron-phonon coupling and Coulomb interactions.The suppression of charge-density wave in one-dimensional system has been ascribed to the short-range Coulomb repulsion and thermal lattice fluctuations.The competition between these interactions can induce zero energy gaps in APPES as well as complete cancellation of charge or spin ordering.
文摘The channeling phenomenon of carbon ions in single-wall carbon nanotubes (SWCNTs) is investigated by using the molecular dynamics simulation with analytical potentials.The relationship between the channeling critical angles in the SWCNT and the bonding interaction is analyzed.It was found that,at 200-5000 eV and 10°-20° of incident angle,the ions with the bonding interaction or chemical effect,have decreased dechanneling probabilities and increased critical angles,compared to that of non-bonding ions.So the bonding effect cannot be ignored in the channeling mechanism of carbon ions through a SWCNT.
基金by the Key Project of the Knowledge Innovation Program of Chinese Academy of Sciences(KJCX3-SYW-N10)the Hundred Talents Program of Chinese Academy of Sciences,the National Natural Science Foundation of China(10874197)+1 种基金the Scientific Research Starting Foundation of the Ministry of Human Resources and Social Security of China for Returned Overseas Chinese Scholarsthe Shanghai Municipal Science and Technology Commission(09ZR1438300,11ZR1445200).
文摘Channeling phenomena of He,Ne,Ar and Kr ions at energy(200–5000 eV)in single-wall carbon nanotubes(SWCNTs)are investigated by molecular dynamics simulation with analytical potentials.The critical angles for the particles to be channeled in an SWCNT are analyzed.In the incident energy range of 200–5000 eV,it is found that the ion energy dependence of the critical angle obeys an improved Lindhard equation which is closely related to the ratio of nuclear charge number to atomic mass Z/M.The critical angle for different types of ions channeling in SWCNTs is determined by both the atomic nuclear charge and mass.
