We study superfluidity of paired Bosonic atoms in optical lattices. The atoms have strong repulsive on-slte energy. Single atom tunneling is severely suppressed while the atom-pair may co-tunnel by the second order qu...We study superfluidity of paired Bosonic atoms in optical lattices. The atoms have strong repulsive on-slte energy. Single atom tunneling is severely suppressed while the atom-pair may co-tunnel by the second order quantum transition, which induces paired superfluidity as repulsive nearest-neighbor interactions are included. The mean-field phase diagram and low energy excitations are explored for a square lattice system.展开更多
Magnetic Fe films grown on single-crystal Mg O(001) and(011) substrates were prepared by direct current magnetron sputtering. The experimental results showed that by applying an external magnetic field of about 300 Oe...Magnetic Fe films grown on single-crystal Mg O(001) and(011) substrates were prepared by direct current magnetron sputtering. The experimental results showed that by applying an external magnetic field of about 300 Oe to film during deposition, a fourfold cubic magnetic anisotropy on Mg O(001) substrate and a twofold uniaxial magnetic anisotropy on Mg O(011) substrate were generated, compared to the isotropic magnetization of Fe film grown without applying the external magnetic field.Our results suggested that external magnetic field during preparation effectively induced relatively higher surface mobility of sputtered Fe atoms and further promoted the crystallization of Fe film and the enhancement of magnetic anisotropy.展开更多
Apparent polarization energy of the localized charge in organic solids consists of electronic polarization energy, permanent electrostatic interactions, and inter/intra molecular relaxation energies. The effective ele...Apparent polarization energy of the localized charge in organic solids consists of electronic polarization energy, permanent electrostatic interactions, and inter/intra molecular relaxation energies. The effective electronic polarization energies for an electron/hole carrier were successfully estimated by AMOEBA polarizable force field in naphthalene molecular crystals. Both electronic polarization energy and permanent electrostatic interaction were in agreement with the preview experimental values. In addition, the influence of the multipoles from different distributed mutipole analysis （DMA） fitting options on the electro- static interactions are discussed in this paper. We found that the multipoles obtained from Gauss-Hermite quadrature without diffuse function or grid-based quadrature with 0.325 A H atomic radius will give reasonable electronic polarization energies and permanent interactions for electron and hole carriers.展开更多
基金Supported by National Natural Science Foundation of China under Grant No.10874018by the 973 Program Project under Grant No.2009CB929101
文摘We study superfluidity of paired Bosonic atoms in optical lattices. The atoms have strong repulsive on-slte energy. Single atom tunneling is severely suppressed while the atom-pair may co-tunnel by the second order quantum transition, which induces paired superfluidity as repulsive nearest-neighbor interactions are included. The mean-field phase diagram and low energy excitations are explored for a square lattice system.
基金supported by the National Natural Science Foundation of China(51332001 and 51402164)Tsinghua University Initiative Scientific Research Program(2014Z21010 and 2014Z01006)
文摘Magnetic Fe films grown on single-crystal Mg O(001) and(011) substrates were prepared by direct current magnetron sputtering. The experimental results showed that by applying an external magnetic field of about 300 Oe to film during deposition, a fourfold cubic magnetic anisotropy on Mg O(001) substrate and a twofold uniaxial magnetic anisotropy on Mg O(011) substrate were generated, compared to the isotropic magnetization of Fe film grown without applying the external magnetic field.Our results suggested that external magnetic field during preparation effectively induced relatively higher surface mobility of sputtered Fe atoms and further promoted the crystallization of Fe film and the enhancement of magnetic anisotropy.
基金supported by the National Natural Science Foundation of China(21173138,21173139)the Fundamental Research Funds for the Central Universities(GK201303004)
文摘Apparent polarization energy of the localized charge in organic solids consists of electronic polarization energy, permanent electrostatic interactions, and inter/intra molecular relaxation energies. The effective electronic polarization energies for an electron/hole carrier were successfully estimated by AMOEBA polarizable force field in naphthalene molecular crystals. Both electronic polarization energy and permanent electrostatic interaction were in agreement with the preview experimental values. In addition, the influence of the multipoles from different distributed mutipole analysis （DMA） fitting options on the electro- static interactions are discussed in this paper. We found that the multipoles obtained from Gauss-Hermite quadrature without diffuse function or grid-based quadrature with 0.325 A H atomic radius will give reasonable electronic polarization energies and permanent interactions for electron and hole carriers.
