Abstract：
:Quasicrystals are unique structures with long-range order but no periodicity. Their properties have intrigued scientists ever since their discovery and initial theoretical analysis. The lack of periodicity excludes the possibility of describing quasicrystal structures with well-established analytical tools, including common notions like Brillouin zones and Bloch's theorem. New and unique features such as fractal-like band structures and 'phason' degrees of freedom are introduced. In general, it is very difficult to directly observe the evolution of electronic waves in solid-state atomic quasicrystals, or the dynamics of the structure itself. Here we use optical induction to create two-dimensional photonic quasicrystals, whose macroscopic nature allows us to explore wave transport phenomena. We demonstrate that light launched at different quasicrystal sites travels through the lattice in a way equivalent to quantum tunnelling of electrons in a quasiperiodic potential. At high intensity, lattice solitons are formed. Finally, we directly observe dislocation dynamics when crystal sites are allowed to interact with each other. Our experimental results apply not only to photonics, but also to other quasiperiodic systems such as matter waves in quasiperiodic traps, generic pattern-forming systems as in parametrically excited surface waves, liquid quasicrystals, and the more familiar atomic quasicrystals.
journal_name
Naturejournal_title
Natureauthors
Freedman B,Bartal G,Segev M,Lifshitz R,Christodoulides DN,Fleischer JWdoi
10.1038/nature04722subject
Has Abstractpub_date
2006-04-27 00:00:00pages
1166-9issue
7088eissn
0028-0836issn
1476-4687pii
nature04722journal_volume
440pub_type
杂志文章相关文献
NATURE文献大全abstract：:Over the last twenty years, there has been rapid growth of a new approach to understanding the evolution of organismic form. This evolutionary developmental biology, or 'evo-devo', is focused on the developmental genetic machinery that lies behind embryological phenotypes, which were all that could be studied in the p...
journal_title：Nature
pub_type： 杂志文章,评审
doi：10.1038/415757a
更新日期：2002-02-14 00:00:00
abstract：:The clinical success of the ABL tyrosine kinase inhibitor imatinib in chronic myeloid leukaemia (CML) serves as a model for molecularly targeted therapy of cancer, but at least two critical questions remain. Can imatinib eradicate leukaemic stem cells? What are the dynamics of relapse due to imatinib resistance, which...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature03669
更新日期：2005-06-30 00:00:00
abstract：:Calcitonin gene-related peptide (CGRP) is a widely expressed neuropeptide that has a major role in sensory neurotransmission. The CGRP receptor is a heterodimer of the calcitonin receptor-like receptor (CLR) class B G-protein-coupled receptor and a type 1 transmembrane domain protein, receptor activity-modifying prote...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/s41586-018-0535-y
更新日期：2018-09-01 00:00:00
abstract：:The nature of ultrahigh-energy cosmic rays (UHECRs) at energies >10(20) eV remains a mystery. They are likely to be of extragalactic origin, but should be absorbed within approximately 50 Mpc through interactions with the cosmic microwave background. As there are no sufficiently powerful accelerators within this dista...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature03614
更新日期：2005-05-19 00:00:00
abstract：:The chemical induction of malignant transformation in BHK cells seems to result from a somatic mutation. Stable transformants, whose frequency is significantly increased by mutagenic carcinogens, can revert to normal and often display temperature-restricted phenotypes indicative of an altered gene product. ...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/264722a0
更新日期：1976-12-23 00:00:00
abstract：:Therapeutic vaccines derived from carbohydrate antigen-adjuvant combinations are a promising approach for cancer immunotherapy. One of the critical limitations in this area is access to sufficient quantities of tumour-associated carbohydrate antigens and glycoconjugate adjuvants. At present, availability of the comple...
journal_title：Nature
pub_type： 杂志文章,评审
doi：10.1038/nature05813
更新日期：2007-04-26 00:00:00
abstract：:The limited ranges of the wild progenitors of many of the primary European domestic species point to their origins further east in Anatolia or the fertile crescent. The wild ox (Bos primigenius), however, ranged widely and it is unknown whether it was domesticated within Europe as one feature of a local contribution t...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/35074088
更新日期：2001-04-26 00:00:00
abstract：:Neurons in the visual cortex are selectively responsive to light or dark bars presented at particular orientations. On the basis of physiological data, this orientation selectivity is hypothesized as being due at least partially to intracortical inhibitory mechanisms. But this hypothesis has been challenged by intrace...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/335815a0
更新日期：1988-10-27 00:00:00
abstract：:Seventeen hominoid fossils recovered from Pliocene strata at Aramis, Middle Awash, Ethiopia make up a series comprising dental, cranial and postcranial specimens dated to around 4.4 million years ago. When compared with Australopithecus afarensis and with modern and fossil apes the Aramis fossil hominids are recognize...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/371306a0
更新日期：1994-09-22 00:00:00
abstract：:There is an urgent need for new drugs to treat malaria, with broad therapeutic potential and novel modes of action, to widen the scope of treatment and to overcome emerging drug resistance. Here we describe the discovery of DDD107498, a compound with a potent and novel spectrum of antimalarial activity against multipl...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature14451
更新日期：2015-06-18 00:00:00
abstract：:The enzyme Cu, Zn superoxide dismutase (SOD) protects against oxidative damage by dismuting the superoxide radical O2-. to molecular oxygen and hydrogen peroxide at the active-site Cu ion in a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance. SOD has evolved to be one of the fastest en...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/358347a0
更新日期：1992-07-23 00:00:00
abstract：:The Earth's equatorial stratosphere shows oscillations in which the east-west winds reverse direction and the temperatures change cyclically with a period of about two years. This phenomenon, called the quasi-biennial oscillation, also affects the dynamics of the mid- and high-latitude stratosphere and weather in the ...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature02142
更新日期：2004-01-08 00:00:00
abstract：:Collagen fibrils have been extensively studied by electron microscopy, but only scant evidence has yet been obtained about their transverse structure. A transverse pediodicity of about 40 or 80 A might be expected if the microfibril model (until recently the common preference) is correct, but little direct evidence fo...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/288410a0
更新日期：1980-11-27 00:00:00
abstract：:El Niño events are characterized by surface warming of the tropical Pacific Ocean and weakening of equatorial trade winds that occur every few years. Such conditions are accompanied by changes in atmospheric and oceanic circulation, affecting global climate, marine and terrestrial ecosystems, fisheries and human activ...
journal_title：Nature
pub_type： 杂志文章,评审
doi：10.1038/s41586-018-0252-6
更新日期：2018-07-01 00:00:00
abstract：:The cosmic radio-frequency spectrum is expected to show a strong absorption signal corresponding to the 21-centimetre-wavelength transition of atomic hydrogen around redshift 20, which arises from Lyman-α radiation from some of the earliest stars. By observing this 21-centimetre signal-either its sky-averaged spectrum...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature25791
更新日期：2018-02-28 00:00:00
abstract：:Defects in the architecture or integrity of the nuclear envelope are associated with a variety of human diseases1. Micronuclei, one common nuclear aberration, are an origin for chromothripsis2, a catastrophic mutational process that is commonly observed in cancer3-5. Chromothripsis occurs after micronuclei spontaneous...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/s41586-018-0534-z
更新日期：2018-09-01 00:00:00
abstract：:DNA methylation is an important epigenetic modification that is essential for various developmental processes through regulating gene expression, genomic imprinting, and epigenetic inheritance. Mammalian genomic DNA methylation is established during embryogenesis by de novo DNA methyltransferases, DNMT3A and DNMT3B, a...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature13899
更新日期：2015-01-29 00:00:00
abstract：:Ribosomes are translational machineries that catalyse protein synthesis. Ribosome structures from various species are known at the atomic level, but obtaining the structure of the human ribosome has remained a challenge; efforts to address this would be highly relevant with regard to human diseases. Here we report the...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature14427
更新日期：2015-04-30 00:00:00
abstract：:A relationship between convergent margin magmas and copper-gold ore mineralization has long been recognized. The nature of the genetic link is controversial, particularly whether the link is due to high-oxygen-fugacity (fO2) melts and fluids released from subducted slabs or to brine exsolution during magmatic evolutio...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature02972
更新日期：2004-10-21 00:00:00
abstract：:Supramolecular soft crystals are periodic structures that are formed by the hierarchical assembly of complex constituents, and occur in a broad variety of 'soft-matter' systems1. Such soft crystals exhibit many of the basic features (such as three-dimensional lattices and space groups) and properties (such as band str...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/s41586-019-1706-1
更新日期：2019-11-01 00:00:00
abstract：:Flash spectra of the total solar eclipse throughout all its phases have been obtained in the extreme ultraviolet for the first time. ...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/226249a0
更新日期：1970-04-18 00:00:00
abstract：:Hunger is a hard-wired motivational state essential for survival. Agouti-related peptide (AgRP)-expressing neurons in the arcuate nucleus (ARC) at the base of the hypothalamus are crucial to the control of hunger. They are activated by caloric deficiency and, when naturally or artificially stimulated, they potently in...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature12956
更新日期：2014-03-13 00:00:00
abstract：:Non-ribosomal peptide synthetase (NRPS) mega-enzyme complexes are modular assembly lines that are involved in the biosynthesis of numerous peptide metabolites independently of the ribosome. The multiple interactions between catalytic domains within the NRPS machinery are further complemented by additional interactions...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature14141
更新日期：2015-05-07 00:00:00
abstract：:Enhancers increase the frequency of transcription initiation from linked promoter elements, most probably as a result of the binding of specific proteins to the enhancer. The polyomavirus early region is expressed in differentiated mouse cells but not in undifferentiated embryonal carcinoma (EC) cells. This host range...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/328087a0
更新日期：1987-07-02 00:00:00
abstract：:Biodiversity is rapidly declining, and this may negatively affect ecosystem processes, including economically important ecosystem services. Previous studies have shown that biodiversity has positive effects on organisms and processes across trophic levels. However, only a few studies have so far incorporated an explic...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature09492
更新日期：2010-11-25 00:00:00
abstract：:Accurate chromosome segregation requires timely dissolution of chromosome cohesion after chromosomes are properly attached to the mitotic spindle. Separase is absolutely essential for cohesion dissolution in organisms from yeast to man. It cleaves the kleisin subunit of cohesin and opens the cohesin ring to allow chro...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/nature17402
更新日期：2016-04-07 00:00:00
abstract：:Muscarinic receptors of cardiac pacemaker and atrial cells are linked to a potassium channel (IK.ACh) by a pertussis toxin-sensitive GTP-binding protein. The dissociation of G-proteins leads to the generation of two potential transducing elements, alpha-GTP and beta gamma. IK.ACh is activated by G-protein alpha- and b...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/337557a0
更新日期：1989-02-09 00:00:00
abstract：:Regulation of ion transport by phosphorylation and G proteins occurs in several epithelial and non-epithelial cell plasma membranes1-5. It is not known whether transporters on intracellular membranes are target sites for second messengers. Here we present direct evidence that a chloride conductance in endocytic vesicl...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/348637a0
更新日期：1990-12-13 00:00:00
abstract：:The AP-1 family of transcription factors, which includes the proto-oncogene products c-Jun and c-Fos, controls the stimulation of cellular genes by growth factors and the expression of oncogenes, including src and ras. Transcriptional activation by c-Jun is regulated by a cell-type-specific inhibitor that represses th...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/352165a0
更新日期：1991-07-11 00:00:00
abstract：:A pathological hallmark of Alzheimer's disease is the deposition of amyloid fibrils in the brain. The principal component of amyloid fibrils is beta/A4 amyloid protein, which can be generated by the aberrant processing of a large membrane-bound glycoprotein, the beta/A4 amyloid protein precursor (APP)3. To test whethe...
journal_title：Nature
pub_type： 杂志文章
doi：10.1038/359064a0
更新日期：1992-09-03 00:00:00
