Optical Gap solitons and Truncated Nonlinear Bloch Waves in Temporal Lattices

Bersch, Christoph; Onishchukov, G.; Peschel, Ulf

doi:10.1103/physrevlett.109.093903

Cited by 37 publications

(28 citation statements)

References 36 publications

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“…Sequence alignment of streptococcal histidine triad proteins suggested E63, H83, H86 and H88 of the first histidine triad motif of PhtD as the Zn 2+ ligands. The three nitrogen atoms that coordinate Zn 2+ were experimentally identified according to the chemical shifts of the corresponding histidine imidazole C δ 2 [64], N δ 1 or N ε 2 [65]. Whereas H83 and H86 unambiguously bind Zn 2+ through their N ε 2, Nδ1 is the Zn 2+ -ligand in the case of H88.…”

Section: Resultsmentioning

confidence: 99%

New Insights into Histidine Triad Proteins: Solution Structure of a Streptococcus pneumoniae PhtD Domain and Zinc Transfer to AdcAII

et al. 2013

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Zinc (Zn2+) homeostasis is critical for pathogen host colonization and invasion. Polyhistidine triad (Pht) proteins, located at the surface of various streptococci, have been proposed to be involved in Zn2+ homeostasis. The phtD gene, coding for a Zn2+-binding protein, is organized in an operon with adcAII coding for the extracellular part of a Zn2+ transporter. In the present work, we investigate the relationship between PhtD and AdcAII using biochemical and structural biology approaches. Immuno-precipitation experiments on purified membranes of Streptococcus pneumoniae (S. pneumoniae) demonstrate that native PhtD and AdcAII interact in vivo confirming our previous in vitro observations. NMR was used to demonstrate Zn2+ transfer from the Zn2+-bound form of a 137 amino acid N-terminal domain of PhtD (t-PhtD) to AdcAII. The high resolution NMR structure of t-PhtD shows that Zn2+ is bound in a tetrahedral site by histidines 83, 86, and 88 as well as by glutamate 63. Comparison of the NMR parameters measured for apo- and Zn2+-t-PhtD shows that the loss of Zn2+ leads to a diminished helical propensity at the C-terminus and increases the local dynamics and overall molecular volume. Structural comparison with the crystal structure of a 55-long fragment of PhtA suggests that Pht proteins are built from short repetitive units formed by three β-strands containing the conserved HxxHxH motif. Taken together, these results support a role for S. pneumoniae PhtD as a Zn2+ scavenger for later release to the surface transporter AdcAII, leading to Zn2+ uptake.

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Section: Resultsmentioning

confidence: 99%

New Insights into Histidine Triad Proteins: Solution Structure of a Streptococcus pneumoniae PhtD Domain and Zinc Transfer to AdcAII

et al. 2013

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“…Physical mechanisms and properties of solitons and vortical ones (vortex solitons) supported by regular nonlinear lattices and a higher-order ones-competing cubic-quintic nonlinear lattices [29,30], as well as the combination of linear and nonlinear lattices [39][40][41][42][43][44][45][46] have recently been explored. * zengjh@opt.ac.cn Besides the fundamental gap solitons, another novel type of self-trapped localized states that are being viewed as truncated nonlinear Bloch waves (TBWs) or gap waves [47][48][49][50][51][52], which reside in the band gap of the linear Bloch-wave spectrum too, were also found in periodic systems. Keep in mind that the first BEC gap soliton [26] composes of few number of atoms, the TBWs, however, are not limited by atom numbers any more, namely, they can be generated for arbitrarily large initial atom numbers.…”

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confidence: 99%

Self-trapped spatially localized states in combined linear-nonlinear periodic potentials

Shi

Zeng

2019

Front. Phys.

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We analyze the existence and stability of two kinds of self-trapped spatially localized gap modes, gap solitons and truncated nonlinear Bloch waves, in one-and two-dimensional optical or matter-wave media with selffocusing nonlinearity, supported by a combination of linear and nonlinear periodic lattice potentials. The former is found to be stable once placed inside a single well of the nonlinear lattice, it is unstable otherwise. Contrary to the case with constant self-focusing nonlinearity, where the latter solution is always unstable, here, we demonstrate that it nevertheless can be stabilized by the nonlinear lattice since the model under consideration combines the unique properties of both the linear and nonlinear lattices. The practical possibilities for experimental realization of the predicted solutions are also discussed.

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“…It is well-know that fundamental gap solitons can be understood as bifurcations from the linear Bloch waves at the symmetry points of the spectrum [3]. Considering the intrinsic relationship between the fundamental gap solitons and the Bloch waves [4][5][6][7], we expect that the two features for the Bloch waves presented above are inherited by the fundamental solitons.…”

Section: Linear Bloch Spectrum and The Parity Symmetry Of Bloch mentioning

confidence: 99%

Gap solitons in spin-orbit-coupled Bose-Einstein condensates in optical lattices

Zhang

Busch

2015

Phys. Rev. A

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We report a diversity of stable gap solitons in a spin-orbit coupled Bose-Einstein condensate subject to a spatially periodic Zeeman field. It is shown that the solitons, can be classified by the main physical symmetries they obey, i.e. symmetries with respect to parity (P), time (T), and internal degree of freedom, i.e. spin, (C) inversions. The conventional gap and gap-stripe solitons are obtained in lattices with different parameters. It is shown that solitons of the same type but obeying different symmetries can exist in the same lattice at different spatial locations. PT and CPT symmetric solitons have anti-ferromagnetic structure and are characterized respectively by nonzero and zero total magnetizations. The progressively growing interest in the physics of mixtures of spinor Bose-Einstein condensates (BECs) and in particular in spin-orbit (SO) coupled BECs (SO-BECs) [1, 2], is motivated on the one hand by their fundamental importance for the atomic physics, and on the other hand by the rich possibilities they offer for emulating synthetic electric and magnetic fields in solids [3]. The last property allows one using neutral atoms to simulate numerous condensed matter phenomena [4] in a tun-able way, what would be impossible in direct condensed matter experiments. In other words, a spinor BEC is a promising candidate for implementation of a quantum simulator, which due to the technologies available nowadays was already implemented using cold atoms [5], ions [6], or photonics [7]. In particular, we mention a recent experiment [8] with coupled (linear) arrays of optical waveguides simulating a discrete version of SO-coupling which in the present letter is considered for the matter waves. Meanwhile, the physics of BECs is characterized by two essential factors, which are not typical for the physics which is aimed to be simulated. First, a BEC is a nonlin-ear system, with the nonlinearity stemming from the two-body interactions [9]. Moreover, by changing the configuration of the system (i.e. of the laser beams) one can create effective nonlinear interactions of different types [10]. Respectively, such nonlinear objects as skyrmions [11], solitons [12, 13], anti-ferromagnetic structures and symmetry breaking [14], have been recently reported for SO-BECs. The second feature, is that a (quasi-) stationary state of the condensate requires the presence of the external potential. This, in particular, imposes constraints on the lower bound of the kinetic energy, what is particularly relevant for SO-BECs (see e.g. [14]). What concerns the external potentials, since the very first experiments with cold atoms loaded in optical lattices [15] it was widely recognized that lattices (i.e. periodic potentials) are particularly efficient in manipulating BECs [16]. Nowadays, the nonlinear properties of the atomic BECs held in optical lattices, described in the mean-field approximation are very well studied [17] (see also [18] for a brief review on BEC mixtures in optical lattices). It is therefore natural that studies of SO-BE...

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Optical Gap solitons and Truncated Nonlinear Bloch Waves in Temporal Lattices

Cited by 37 publications

References 36 publications

New Insights into Histidine Triad Proteins: Solution Structure of a Streptococcus pneumoniae PhtD Domain and Zinc Transfer to AdcAII

New Insights into Histidine Triad Proteins: Solution Structure of a Streptococcus pneumoniae PhtD Domain and Zinc Transfer to AdcAII

Self-trapped spatially localized states in combined linear-nonlinear periodic potentials

Gap solitons in spin-orbit-coupled Bose-Einstein condensates in optical lattices

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