报告摘要:
We discover surprising consequences of well-known quantum effects such as zero-point energies, superposition and interferences of quantum states, decoherence. The examples include a new type of chemical bonding: “vibrational bonding” stabilizes BrMuBr due to effects of vibrational zero point energies (Muonium Mu is the light isotope of hydrogen, mMu = mH/9). The large mass ratio enables another effect in molecules such as FHF-, CdH2 or OsH4: well designed circularly polarized laser pulses excite superposition states with strong ring currents of the nuclei that induce very strong intra-molecular magnetic fields (B > 600 T). By analogy, one can induce charge circulation with strong electronic fluxes in electronic superposition states of molecules such as Mg-porphyrine. Analogous preparation of interfering electronic states in molecular ions such as H2+ or HCCI+ support periodic charge migration, on time scale from few hundred attoseconds to few femtoseconds. In addition to linear (1D) and circular 3 (2D) charge migrations, one can design laser pulses which induce helical (3D) charge migration. Laser control of charge migration is simulated for C6H6. Laser pulses can break electronic structure symmetry even when the nuclear symmetry is conserved. Symmetry can be restored by a second pulse, with few attosecond precision of the time delay, also confirmed experimentally for the 87Rb atom. In general, the laser induced electronic charge migration suffers from decoherence due to nuclear motions. This enemy can be converted to a friend causing partial re-coherences.
报告人简介：
Joern Manz院士是世界著名物理化学家，德国科学院院士，德国柏林自由大学终身教授。J.Manz院士是超快飞秒动力学研究领域的创始人之一，在分子的超快量子动力学演化与激光超控分子量子态等方面作出了一系列开创性的工作，先后应邀在100多次国际会议上作邀请报告。J.Manz教授于2009年当选德国科学院院士，J.Manz院士与国内相关院校开展了长期紧密的合作研究，被聘为山西大学特聘教授，入选首批“山西特聘专家”。
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北京大学物理学院学术论坛创办于2020年9月，邀请国内外高校和研究机构高层次科技创新领军学者就物理学及相关领域的基础前沿探索、关键技术突破和热点问题等做学术演讲，旨在推进高质量学术交流，促进学科交叉融合和开拓新兴特色方向研究，培养具有科学精神、全球视野、创新能力、批判性思维的优秀青年人才。
主办：
北京大学物理学院
中国光学学会
联系人：
孙嘉琪 jqsun@pku.edu.cn
