Fleischmann, Ragnar

[["dc.bibliographiccitation.artnumber","016804"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","89"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T10:23:48Z"],["dc.date.available","2018-11-07T10:23:48Z"],["dc.date.issued","2002"],["dc.description.abstract","Recent experiments on symmetry-broken mesoscopic semiconductor structures have exhibited an amazing rectifying effect in the transverse current-voltage characteristics with promising prospects for future applications. We present a simple microscopic model, which takes into account the energy dependence of current-carrying modes and explains the rectifying effect by an interplay of fully quantized and quasiclassical transport channels in the system. It also suggests the design of a ballistic rectifier with an optimized rectifying signal and predicts voltage oscillations which may provide an experimental test for the mechanism considered here."],["dc.identifier.doi","10.1103/PhysRevLett.89.016804"],["dc.identifier.isi","000176285700040"],["dc.identifier.pmid","12097062"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42533"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Mesoscopic rectifiers based on ballistic transport"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","203903"],["dc.bibliographiccitation.issue","20"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Metzger, J. J."],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T09:40:01Z"],["dc.date.available","2018-11-07T09:40:01Z"],["dc.date.issued","2014"],["dc.description.abstract","Waves traveling through random media exhibit random focusing that leads to extremely high wave intensities even in the absence of nonlinearities. Although such extreme events are present in a wide variety of physical systems and the statistics of the highest waves is important for their analysis and forecast, it remains poorly understood, in particular, in the regime where the waves are highest. We suggest a new approach that greatly simplifies the mathematical analysis and calculate the scaling and the distribution of the highest waves valid for a wide range of parameters."],["dc.description.sponsorship","DFG research group 760"],["dc.identifier.doi","10.1103/PhysRevLett.112.203903"],["dc.identifier.isi","000336914800005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33416"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Statistics of Extreme Waves in Random Media"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e26457"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Hennig, Holger"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Fredebohm, Anneke"],["dc.contributor.author","Hagmayer, York"],["dc.contributor.author","Nagler, Jan"],["dc.contributor.author","Witt, Annette"],["dc.contributor.author","Theis, Fabian J."],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T08:50:38Z"],["dc.date.available","2018-11-07T08:50:38Z"],["dc.date.issued","2011"],["dc.description.abstract","Although human musical performances represent one of the most valuable achievements of mankind, the best musicians perform imperfectly. Musical rhythms are not entirely accurate and thus inevitably deviate from the ideal beat pattern. Nevertheless, computer generated perfect beat patterns are frequently devalued by listeners due to a perceived lack of human touch. Professional audio editing software therefore offers a humanizing feature which artificially generates rhythmic fluctuations. However, the built-in humanizing units are essentially random number generators producing only simple uncorrelated fluctuations. Here, for the first time, we establish long-range fluctuations as an inevitable natural companion of both simple and complex human rhythmic performances. Moreover, we demonstrate that listeners strongly prefer long-range correlated fluctuations in musical rhythms. Thus, the favorable fluctuation type for humanizing interbeat intervals coincides with the one generically inherent in human musical performances."],["dc.identifier.doi","10.1371/journal.pone.0026457"],["dc.identifier.isi","000296519600019"],["dc.identifier.pmid","22046289"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/8345"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21739"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 2.5"],["dc.rights.uri","https://creativecommons.org/licenses/by/2.5"],["dc.title","The Nature and Perception of Fluctuations in Human Musical Rhythms"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","013901"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Metzger, J. J."],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T09:22:31Z"],["dc.date.available","2018-11-07T09:22:31Z"],["dc.date.issued","2013"],["dc.description.abstract","Waves traveling through weakly random media are known to be strongly affected by their corresponding ray dynamics, in particular in forming linear freak waves. The ray intensity distribution, which, e. g., quantifies the probability of freak waves is unknown, however, and a theory of how it is approached in an appropriate semiclassical limit of wave mechanics is lacking. We show that this limit is not the usual limit of small wavelengths, but that of decoherence. Our theory, which can describe the intensity distribution for an arbitrary degree of coherence is relevant to a wide range of physical systems, as decoherence is omnipresent in real systems."],["dc.description.sponsorship","DFG Forschergruppe [760]"],["dc.identifier.doi","10.1103/PhysRevLett.111.013901"],["dc.identifier.isi","000321209200006"],["dc.identifier.pmid","23863000"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29355"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1079-7114"],["dc.relation.issn","0031-9007"],["dc.title","Intensity Fluctuations of Waves in Random Media: What Is the Semiclassical Limit?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","015202"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW E"],["dc.bibliographiccitation.volume","76"],["dc.contributor.author","Hennig, Holger"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Hufnagel, L."],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T11:01:17Z"],["dc.date.available","2018-11-07T11:01:17Z"],["dc.date.issued","2007"],["dc.description.abstract","In mesoscopic systems, conductance fluctuations are a sensitive probe of electron dynamics and chaotic phenomena. We show that the conductance of a purely classical chaotic system, with either fully chaotic or mixed phase space, generically exhibits fractal conductance fluctuations unrelated to quantum interference. This might explain the unexpected dependence of the fractal dimension of the conductance curves on the (quantum) phase breaking length observed in experiments on semiconductor quantum dots."],["dc.identifier.doi","10.1103/PhysRevE.76.015202"],["dc.identifier.isi","000248552600004"],["dc.identifier.pmid","17677525"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51114"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","2470-0053"],["dc.relation.issn","2470-0045"],["dc.title","Fractal conductance fluctuations of classical origin"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","073045"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","11"],["dc.contributor.affiliation","Ng, G S;"],["dc.contributor.affiliation","Hennig, H;"],["dc.contributor.affiliation","Fleischmann, R;"],["dc.contributor.affiliation","Kottos, T;"],["dc.contributor.affiliation","Geisel, T;"],["dc.contributor.author","Ng, G. S."],["dc.contributor.author","Hennig, Holger"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T08:27:41Z"],["dc.date.available","2018-11-07T08:27:41Z"],["dc.date.issued","2009"],["dc.date.updated","2022-02-09T18:32:47Z"],["dc.description.abstract","We study the decay of an atomic Bose-Einstein condensate (BEC) population N(tau) from the leaking boundaries of an optical lattice (OL). For a rescaled interatomic interaction strength Lambda > Lambda(b), discrete breathers (DBs) are created that prevent the atoms from reaching the leaking boundaries. Collisions of other lattice excitations with the outermost DBs result in avalanches, i.e. steps in N(tau), which for a whole range of Lambda-values follow a scale-free distribution P(J = delta N) similar to 1/J(alpha). A theoretical analysis of the mixed phase space of the system indicates that 1 < alpha < 3, in agreement with our numerical findings."],["dc.description.sponsorship","United States-Israel Binational Science Foundation (BSF); DFG [760]"],["dc.identifier.doi","10.1088/1367-2630/11/7/073045"],["dc.identifier.eissn","1367-2630"],["dc.identifier.fs","509673"],["dc.identifier.isi","000268324700009"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?goescholar/4056"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16259"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights.access","openAccess"],["dc.rights.uri","https://goedoc.uni-goettingen.de/licenses"],["dc.subject.ddc","530"],["dc.title","Avalanches of Bose-Einstein condensates in leaking optical lattices"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","020601"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","105"],["dc.contributor.author","Metzger, J. J."],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T08:41:25Z"],["dc.date.available","2018-11-07T08:41:25Z"],["dc.date.issued","2010"],["dc.description.abstract","Even very weak correlated disorder potentials can cause extreme fluctuations in Hamiltonian flows. In two dimensions this leads to a pronounced branching of the flow. Although present in a great variety of physical systems, a quantitative theory of the branching statistics is lacking. Here, we derive an analytical expression for the number of branches valid for all distances from a source. We also derive the scaling relations that make this expression universal for a wide range of random potentials. Our theory has possible applications in many fields ranging from semiconductor to geophysics."],["dc.description.sponsorship","DFG [760]"],["dc.identifier.doi","10.1103/PhysRevLett.105.020601"],["dc.identifier.isi","000279608500001"],["dc.identifier.pmid","20867694"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19463"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Universal Statistics of Branched Flows"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","259"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Nature Physics"],["dc.bibliographiccitation.lastpage","+"],["dc.bibliographiccitation.volume","12"],["dc.contributor.author","Degueldre, Henri"],["dc.contributor.author","Metzger, J. J."],["dc.contributor.author","Geisel, Theo"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.date.accessioned","2018-11-07T10:17:47Z"],["dc.date.available","2018-11-07T10:17:47Z"],["dc.date.issued","2016"],["dc.description.abstract","Tsunamis exhibit surprisingly strong height fluctuations. An in-depth understanding of the mechanisms that lead to these variations in wave height is a prerequisite for reliable tsunami forecasting. It is known, for example, that the presence of large underwater islands(1) or the shape of the tsunami source(2) can affect the wave heights. Here we show that the consecutive effect of even tiny fluctuations in the profile of the ocean floor (the bathymetry) can cause unexpectedly strong fluctuations in the wave height of tsunamis, with maxima several times higher than the average wave height. A novel approach combining stochastic caustic theory and shallow water wave dynamics allows us to determine the typical propagation distance at which the strongly focused waves appear. We demonstrate that owing to this mechanism the small errors present in bathymetry measurements can lead to drastic variations in predicted tsunami heights. Our results show that a precise knowledge of the ocean's bathymetry is absolutely indispensable for reliable tsunami forecasts."],["dc.description.sponsorship","DFG research group 760"],["dc.identifier.doi","10.1038/NPHYS3557"],["dc.identifier.isi","000371505200020"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41292"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Nature Publishing Group"],["dc.relation.issn","1745-2481"],["dc.relation.issn","1745-2473"],["dc.title","Random focusing of tsunami waves"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","021119"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW E"],["dc.bibliographiccitation.volume","84"],["dc.contributor.author","Zheng, Mei C."],["dc.contributor.author","Ellis, Fred M."],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.contributor.author","Prosen, Tomaz"],["dc.date.accessioned","2018-11-07T08:53:17Z"],["dc.date.available","2018-11-07T08:53:17Z"],["dc.date.issued","2011"],["dc.description.abstract","We show that a harmonic lattice model with amplifying and attenuating elements, when coupled to two thermal baths, exhibits unique heat transport properties. Some of these novel features include anomalous nonequilibrium steady-state heat currents, negative differential thermal conductance, as well as nonreciprocal heat transport. We find that when these elements are arranged in a PT-symmetric manner, the domain of existence of the nonequilibrium steady state is maximized. We propose an electronic experimental setup based on resistive-inductive-capacitive (RLC) transmission lines, where our predictions can be tested."],["dc.identifier.doi","10.1103/PhysRevE.84.021119"],["dc.identifier.isi","000293778100002"],["dc.identifier.pmid","21928961"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22374"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1539-3755"],["dc.title","Heat transport in active harmonic chains"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","64"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Physics Today"],["dc.bibliographiccitation.lastpage","65"],["dc.bibliographiccitation.volume","65"],["dc.contributor.author","Hennig, Holger"],["dc.contributor.author","Fleischmann, Ragnar"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T09:08:37Z"],["dc.date.available","2018-11-07T09:08:37Z"],["dc.date.issued","2012"],["dc.identifier.isi","000306302300022"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26075"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Inst Physics"],["dc.relation.issn","0031-9228"],["dc.title","Musical rhythms: The science of being slightly off"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","letter_note"],["dspace.entity.type","Publication"]]