TY  - JOUR
A1  - Görl, Daniel
A1  - Zhang, Xin
A1  - Stepanenko, Vladimir
A1  - Würthner, Frank
T1  - Supramolecular block copolymers by kinetically controlled co-self-assembly of planar and core-twisted perylene bisimides
JF  - Nature Communications
N2  - New synthetic methodologies for the formation of block copolymers have revolutionized polymer science within the last two decades. However, the formation of supramolecular block copolymers composed of alternating sequences of larger block segments has not been realized yet. Here we show by transmission electron microscopy (TEM), 2D NMR and optical spectroscopy that two different perylene bisimide dyes bearing either a flat (A) or a twisted (B) core self-assemble in water into supramolecular block copolymers with an alternating sequence of (A\(_{m}\)BB)\(_{n}\). The highly defined ultralong nanowire structure of these supramolecular copolymers is entirely different from those formed upon self-assembly of the individual counterparts, that is, stiff nanorods (A) and irregular nanoworms (B), respectively. Our studies further reveal that the as-formed supramolecular block copolymer constitutes a kinetic self-assembly product that transforms into thermodynamically more stable self-sorted homopolymers upon heating.
KW  - cylindrical micelles
KW  - water
KW  - amplification
KW  - association
KW  - emission
KW  - organization
KW  - polymerization
KW  - dyes
KW  - fluorescent
KW  - aqueous medium
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-148657
VL  - 6
IS  - 7009
ER  - 
TY  - JOUR
A1  - Zhang, Xin
A1  - Wu, Wei
A1  - Li, Gang
A1  - Wen, Lin
A1  - Sun, Qing
A1  - Ji, An-Chun
T1  - Phase diagram of interacting Fermi gas in spin-orbit coupled square lattices
JF  - New Journal of Physics
N2  - The spin-orbit (SO) coupled optical lattices have attracted considerable interest. In this paper, we investigate the phase diagram of the interacting Fermi gas with Rashba-type spin-orbit coupling (SOC) on a square optical lattice. The phase diagram is investigated in a wide range of atomic interactions and SOC strength within the framework of the cluster dynamical mean-field theory (CDMFT). We show that the interplay between the atomic interactions and SOC results in a rich phase diagram. In the deep Mott insulator regime, the SOC can induce diverse spin ordered phases. Whereas near the metal-insulator transition (MIT), the SOC tends to destroy the conventional antiferromagnetic fluctuations, giving rise to distinctive features of the MIT. Furthermore, the strong fluctuations arising from SOC may destroy the magnetic orders and trigger an order to disorder transition in close proximity of the MIT.
KW  - ultracold
KW  - hubbard-model
KW  - physics transition
KW  - metal-insulator transition
KW  - cluster dynamical mean-field theory
KW  - atomic gases
KW  - mean-field theory
KW  - mott insulator
KW  - optical lattice
KW  - weak ferromagnetism
KW  - quantum gases
KW  - superfluid
KW  - spin-orbit coupling
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-151475
VL  - 17
IS  - 073036
ER  -