Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found ...Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found that the interfaces in spintronic device, so called spinterface, is of critical importance for many key issues in molecular spintronics, such as enhancing spin injection, lengthening spin transport distance, as well as manipulating spin signals in molecular spintronic devices. Here in this review, recent studies regarding spinterface in molecular devices, especially those impressive efforts devoted on spin manipulation, have been systematically summarized and discussed.展开更多
本文利用低温扫描隧道显微镜(low temperature scanning tunneling microscopy,LT-STM)研究了四联苯分子在半金属Bi(111)表面上的超分子手性及其自组装结构。在极低的覆盖度下,四联苯分子形成纳米尺度的分子团簇,团簇中的分子有平躺和...本文利用低温扫描隧道显微镜(low temperature scanning tunneling microscopy,LT-STM)研究了四联苯分子在半金属Bi(111)表面上的超分子手性及其自组装结构。在极低的覆盖度下,四联苯分子形成纳米尺度的分子团簇,团簇中的分子有平躺和侧躺的取向。随着覆盖度的增加,四联苯分子形成多畴的自组装单层结构。自组装单层的基本结构单元是由两个平躺分子和一个侧躺分子构成的三聚体。高分辩的STM图表明,平躺的四联苯分子表现出结构对称性,而侧躺的四联苯分子表现为四个之字形的突起,表明四个苯环之间发生了扭曲,使得三聚体团簇具有超分子手性。有趣的是,在畴区内部相邻两个三聚体的手性相反;在畴界两侧两个三聚体的手性相同,表明同手性的三聚体之间存在空间位阻作用。当覆盖度增加到一个满层,畴界不复存在,整个分子单层形成长程有序的消旋结构。此外,由于分子与半金属衬底之间较弱的相互作用,无论是侧躺的分子还是平躺的分子,都会受到针尖电场的影响发生移动或转动。上述研究结果为理解四联苯分子和半金属之间的相互作用,超分子手性和分子自组装结构之间的关联,以及制备长程有序的界面结构提供了重要信息。展开更多
Molecular Landers are a class of compounds containing an aromatic board as well as bulky side groups which upon adsorption of the molecule on a surface may lift the molecular board away from the substrate.Different mo...Molecular Landers are a class of compounds containing an aromatic board as well as bulky side groups which upon adsorption of the molecule on a surface may lift the molecular board away from the substrate.Different molecular Landers have extensively been studied as model systems for nanomachines and the formation of molecular wires,as well as for their function as“molecular moulds”,i.e.,acting as templates by accommodating metal atoms underneath their aromatic board.Here,we investigate the adsorption of a novel Lander molecule 1,4-bis(4-(2,4-diaminotriazine)phenyl)-2,3,5,6-tetrakis(4-tert-butylphenyl)benzene(DAT,C_(64)H_(68)N_(10))on Cu(110)and Au(111)surfaces under ultrahigh vacuum(UHV)conditions.By means of scanning tunneling microscopy(STM)imaging and manipulation,we characterize the morphology and binding geometries of DAT molecules at terraces and step edges.On the Cu(110)surface,various contact configurations of individual DAT Landers were formed at the step edges in a controlled manner,steered by STM manipulation,including lateral translation,rotation,and pushing molecules to an upper terrace.The diffusion barrier of single DAT molecules on Au(111)is considerably smaller than on Cu(110).The DAT Lander is specially designed with diamino-triazine side groups making it suitable for future studies of molecular self-assembly by hydrogen-bonding interactions.The results presented here are an important guide to the choice of substrate for future studies using this compound.展开更多
Based on the strong magnetic anisotropy along the symmetry of the crystal, we construct a U（2） non-Abelian gauge potential for the molecular nanomagnet Mn12 by varying the external magnetic field adiabatically. More...Based on the strong magnetic anisotropy along the symmetry of the crystal, we construct a U（2） non-Abelian gauge potential for the molecular nanomagnet Mn12 by varying the external magnetic field adiabatically. Moreover, the non-Abelian geometric phase and the unitary matrix operation, which are tile key steps to realize the universal holonomic quantum computing in the degenerate subspace, are also obtained by means of choosing an evolution path properly.展开更多
DNA 计算是应用分子生物技术进行计算的新方法。从理论上研究 DNA 计算方法,有利于推动理论计算科学的发展。本系列文章应用形式语言及自动机理论技术,系统地探讨了 DNA 分子的可计算性及其计算能力。本文主要介绍常用 DNA 分子操作方法...DNA 计算是应用分子生物技术进行计算的新方法。从理论上研究 DNA 计算方法,有利于推动理论计算科学的发展。本系列文章应用形式语言及自动机理论技术,系统地探讨了 DNA 分子的可计算性及其计算能力。本文主要介绍常用 DNA 分子操作方法,并根据 DNA 分子的结构及特点,给出了 DNA 分子的形式化描述。展开更多
Three different methods are used to manipulate and control phthalocyanine based single molecular rotors on Au （111） surface： （1） changing the molecular structure to alter the rotation potential; （2） using the t...Three different methods are used to manipulate and control phthalocyanine based single molecular rotors on Au （111） surface： （1） changing the molecular structure to alter the rotation potential; （2） using the tunnelling current of the scanning tunnelling microscope （STM） to change the thermal equilibrium of the molecular rotor; （3） artificial manipulation of the molecular rotor to switch the rotation on or off by an STM tip. Furthermore, a molecular ＇gear wheel＇ is successfully achieved with two neighbouring molecules.展开更多
解淀粉芽孢杆菌是FDA认定的安全级(generally recognized as safe,GRAS)菌株,在工业酶制剂、高分子聚合物、大宗化学品、绿色生物农药等方面的生产具有突出的优势。近年来,随着解淀粉芽孢杆菌的分子遗传操作技术越来越成熟,对利用该菌...解淀粉芽孢杆菌是FDA认定的安全级(generally recognized as safe,GRAS)菌株,在工业酶制剂、高分子聚合物、大宗化学品、绿色生物农药等方面的生产具有突出的优势。近年来,随着解淀粉芽孢杆菌的分子遗传操作技术越来越成熟,对利用该菌开发成微生物发酵平台化菌株用于合成生物学制造领域提出了更迫切的需求。文中围绕解淀粉芽孢杆菌的遗传操作工具、代谢改造应用和未来发展前景等方面进行了详细综述,为进一步推动解淀粉芽孢杆菌合成生物学技术的创新与发展提供借鉴和参考。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.21673059)the Funds from Ministry of Science and Technology of China(Grant Nos.2017YFA0206600 and 2016YFA0200700)+1 种基金the Instrument Development Project of Chinese Academy of Sciences(Grant No.YJKYYQ20170037)the CAS Pioneer Hundred Talents Program
文摘Molecular spintronics is an emerging field which evoked wide research attention since the first molecule-based spintronic device has been reported at 2002. Due to the active study over the last few years, it is found that the interfaces in spintronic device, so called spinterface, is of critical importance for many key issues in molecular spintronics, such as enhancing spin injection, lengthening spin transport distance, as well as manipulating spin signals in molecular spintronic devices. Here in this review, recent studies regarding spinterface in molecular devices, especially those impressive efforts devoted on spin manipulation, have been systematically summarized and discussed.
文摘本文利用低温扫描隧道显微镜(low temperature scanning tunneling microscopy,LT-STM)研究了四联苯分子在半金属Bi(111)表面上的超分子手性及其自组装结构。在极低的覆盖度下,四联苯分子形成纳米尺度的分子团簇,团簇中的分子有平躺和侧躺的取向。随着覆盖度的增加,四联苯分子形成多畴的自组装单层结构。自组装单层的基本结构单元是由两个平躺分子和一个侧躺分子构成的三聚体。高分辩的STM图表明,平躺的四联苯分子表现出结构对称性,而侧躺的四联苯分子表现为四个之字形的突起,表明四个苯环之间发生了扭曲,使得三聚体团簇具有超分子手性。有趣的是,在畴区内部相邻两个三聚体的手性相反;在畴界两侧两个三聚体的手性相同,表明同手性的三聚体之间存在空间位阻作用。当覆盖度增加到一个满层,畴界不复存在,整个分子单层形成长程有序的消旋结构。此外,由于分子与半金属衬底之间较弱的相互作用,无论是侧躺的分子还是平躺的分子,都会受到针尖电场的影响发生移动或转动。上述研究结果为理解四联苯分子和半金属之间的相互作用,超分子手性和分子自组装结构之间的关联,以及制备长程有序的界面结构提供了重要信息。
基金We acknowledge financial support from the IST Pico-Inside and NMP Frontiers European projects as well as grants from the Danish Ministry of Science,Technology and Innovation and from the Danish Research Councils.M.H and Y.B.J thank the CMIFM via the Volubilis France-Morocco exchange program.
文摘Molecular Landers are a class of compounds containing an aromatic board as well as bulky side groups which upon adsorption of the molecule on a surface may lift the molecular board away from the substrate.Different molecular Landers have extensively been studied as model systems for nanomachines and the formation of molecular wires,as well as for their function as“molecular moulds”,i.e.,acting as templates by accommodating metal atoms underneath their aromatic board.Here,we investigate the adsorption of a novel Lander molecule 1,4-bis(4-(2,4-diaminotriazine)phenyl)-2,3,5,6-tetrakis(4-tert-butylphenyl)benzene(DAT,C_(64)H_(68)N_(10))on Cu(110)and Au(111)surfaces under ultrahigh vacuum(UHV)conditions.By means of scanning tunneling microscopy(STM)imaging and manipulation,we characterize the morphology and binding geometries of DAT molecules at terraces and step edges.On the Cu(110)surface,various contact configurations of individual DAT Landers were formed at the step edges in a controlled manner,steered by STM manipulation,including lateral translation,rotation,and pushing molecules to an upper terrace.The diffusion barrier of single DAT molecules on Au(111)is considerably smaller than on Cu(110).The DAT Lander is specially designed with diamino-triazine side groups making it suitable for future studies of molecular self-assembly by hydrogen-bonding interactions.The results presented here are an important guide to the choice of substrate for future studies using this compound.
基金Supported by the National Natural Science Foundation of China under Grant Nos. 11074154, 11074184, and 11075099the National Science Funding of Zhejiang Province under Grant No. Y6090001
文摘Based on the strong magnetic anisotropy along the symmetry of the crystal, we construct a U（2） non-Abelian gauge potential for the molecular nanomagnet Mn12 by varying the external magnetic field adiabatically. Moreover, the non-Abelian geometric phase and the unitary matrix operation, which are tile key steps to realize the universal holonomic quantum computing in the degenerate subspace, are also obtained by means of choosing an evolution path properly.
文摘DNA 计算是应用分子生物技术进行计算的新方法。从理论上研究 DNA 计算方法,有利于推动理论计算科学的发展。本系列文章应用形式语言及自动机理论技术,系统地探讨了 DNA 分子的可计算性及其计算能力。本文主要介绍常用 DNA 分子操作方法,并根据 DNA 分子的结构及特点,给出了 DNA 分子的形式化描述。
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 60771037 and 10774176)the National Basic Research Program of China (Grant No. 2007CB936802)
文摘Three different methods are used to manipulate and control phthalocyanine based single molecular rotors on Au （111） surface： （1） changing the molecular structure to alter the rotation potential; （2） using the tunnelling current of the scanning tunnelling microscope （STM） to change the thermal equilibrium of the molecular rotor; （3） artificial manipulation of the molecular rotor to switch the rotation on or off by an STM tip. Furthermore, a molecular ＇gear wheel＇ is successfully achieved with two neighbouring molecules.
文摘解淀粉芽孢杆菌是FDA认定的安全级(generally recognized as safe,GRAS)菌株,在工业酶制剂、高分子聚合物、大宗化学品、绿色生物农药等方面的生产具有突出的优势。近年来,随着解淀粉芽孢杆菌的分子遗传操作技术越来越成熟,对利用该菌开发成微生物发酵平台化菌株用于合成生物学制造领域提出了更迫切的需求。文中围绕解淀粉芽孢杆菌的遗传操作工具、代谢改造应用和未来发展前景等方面进行了详细综述,为进一步推动解淀粉芽孢杆菌合成生物学技术的创新与发展提供借鉴和参考。
