Geisel, Theo

[["dc.bibliographiccitation.artnumber","023621"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW A"],["dc.bibliographiccitation.volume","79"],["dc.contributor.author","Hiller, Moritz"],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T08:33:16Z"],["dc.date.available","2018-11-07T08:33:16Z"],["dc.date.issued","2009"],["dc.description.abstract","We study the energy redistribution of interacting bosons in a ring-shaped quantum trimer as the coupling strength between neighboring sites of the corresponding Bose-Hubbard Hamiltonian undergoes a sudden change delta k. Our analysis is based on a threefold approach combining linear response theory calculations as well as semiclassical and random matrix theory considerations. The delta k borders of applicability of each of these methods are identified by direct comparison with the exact quantum-mechanical results. We find that while the variance of the evolving quantum distribution shows a remarkable quantum-classical correspondence (QCC) for all delta k values, other moments exhibit this QCC only in the nonperturbative delta k regime."],["dc.description.sponsorship","United States-Israel Binational Science Foundation (BSF); DFG"],["dc.identifier.doi","10.1103/PhysRevA.79.023621"],["dc.identifier.isi","000263815000135"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17535"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1094-1622"],["dc.relation.issn","1050-2947"],["dc.title","Wave-packet dynamics in energy space of a chaotic trimeric Bose-Hubbard system"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1025"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Annals of Physics"],["dc.bibliographiccitation.lastpage","1062"],["dc.bibliographiccitation.volume","321"],["dc.contributor.author","Hiller, Moritz"],["dc.contributor.author","Cohen, Doron"],["dc.contributor.author","Geisel, Theo"],["dc.contributor.author","Kottos, Tsampikos"],["dc.date.accessioned","2018-11-07T09:50:35Z"],["dc.date.available","2018-11-07T09:50:35Z"],["dc.date.issued","2006"],["dc.description.abstract","We introduce and analyze the physics of \"driving reversal\" experiments. These are prototype wavepacket dynamics scenarios probing quantum irreversibility. Unlike the mostly hypothetical \"time reversal\" concept, a \"driving reversal\" scenario can be realized in a laboratory experiment, and is relevant to the theory of quantum dissipation. We study both the energy spreading and the survival probability in such experiments. We also introduce and study the \"compensation time\" (time of maximum return) in such a scenario. Extensive effort is devoted to figuring out the capability of either linear response theory or random matrix theory (RMT) to describe specific features of the time evolution. We explain that RMT modeling leads to a strong non-perturbative response effect that differs from the semiclassical behavior. (c) 2005 Elsevier Inc. All rights reserved."],["dc.identifier.doi","10.1016/j.aop.2005.12.003"],["dc.identifier.isi","000237007500001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35735"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Academic Press Inc Elsevier Science"],["dc.relation.issn","1096-035X"],["dc.relation.issn","0003-4916"],["dc.title","Wavepacket dynamics, quantum reversibility, and random matrix theory"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","010402"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Hiller, Moritz"],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Cohen, Doron"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T10:51:49Z"],["dc.date.available","2018-11-07T10:51:49Z"],["dc.date.issued","2004"],["dc.description.abstract","We study the possibility to undo the quantum mechanical evolution in a time reversal experiment. The naive expectation, as reflected in the common terminology (\"Loschmidt echo\"), is that maximum compensation results if the reversed dynamics extends to the same time as the forward evolution. We challenge this belief and demonstrate that the time t(r) for maximum return probability is in general shorter. We find that t(r) depends on lambda=epsilon(evol)/epsilon(prep), being the ratio of the error in setting the parameters (fields) for the time-reversed evolution to the perturbation which is involved in the preparation process. Our results should be observable in spin-echo experiments where the dynamical irreversibility of quantum phases is measured."],["dc.identifier.doi","10.1103/PhysRevLett.92.010402"],["dc.identifier.isi","000187968500002"],["dc.identifier.pmid","14753976"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/48969"],["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","Quantum reversibility: Is there an echo?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","061604"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW A"],["dc.bibliographiccitation.volume","73"],["dc.contributor.author","Hiller, Moritz"],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T09:47:10Z"],["dc.date.available","2018-11-07T09:47:10Z"],["dc.date.issued","2006"],["dc.description.abstract","We consider a family of chaotic Bose-Hubbard Hamiltonians parametrized by the coupling strength k between neighboring sites. As k increases the eigenstates undergo changes, reflected in the structure of the local density of states. We analyze these changes, both numerically and analytically, using perturbative and semiclassical methods. Although our focus is on the quantum trimer, the presented methodology is applicable for the analysis of longer lattices as well."],["dc.identifier.doi","10.1103/PhysRevA.73.061604"],["dc.identifier.isi","000238694900012"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35047"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1050-2947"],["dc.title","Complexity in parametric Bose-Hubbard Hamiltonians and structural analysis of eigenstates"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","719"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","EUROPHYSICS LETTERS"],["dc.bibliographiccitation.lastpage","725"],["dc.bibliographiccitation.volume","62"],["dc.contributor.author","Ossipov, A."],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T10:38:33Z"],["dc.date.available","2018-11-07T10:38:33Z"],["dc.date.issued","2003"],["dc.description.abstract","We investigate the distribution of the resonance widths P(Gamma) and Wigner delay times P(tau(W)) for scattering from two-dimensional systems in the diffusive regime. We obtain the forms of these distributions (log-normal for large tau(W) and small Gamma, and power law in the opposite case) for different symmetry classes and show that they are determined by the underlying diffusive classical dynamics. Our theoretical arguments are supported by extensive numerical calculations."],["dc.identifier.doi","10.1209/epl/i2003-00432-x"],["dc.identifier.isi","000183283500016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45837"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E D P Sciences"],["dc.relation.issn","0295-5075"],["dc.title","Fingerprints of classical diffusion in open 2D mesoscopic systems in the metallic regime"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1765"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","PHYSICAL REVIEW B"],["dc.bibliographiccitation.lastpage","1772"],["dc.bibliographiccitation.volume","62"],["dc.contributor.author","Weiss, M."],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T10:39:34Z"],["dc.date.available","2018-11-07T10:39:34Z"],["dc.date.issued","2000"],["dc.description.abstract","We investigate the scaling properties of eigenstates of a one-dimensional Anderson model in the presence of a constant electric field. The states show a transition from exponential to factorial localization. For infinite systems this transition can be described by a simple scaling law based on a single parameter lambda(infinity) = l(infinity)/l(el), the ratio between the Anderson localization length l(el) and the Stark localization length l(el). For finite samples, however, the system size N enters the problem as a third parameter. In that case the global structure of eigenstates is uniquely determined by two scaling parameters lambda(N) = l(infinity)/N and lambda(infinity) = l infinity/l(el)."],["dc.identifier.doi","10.1103/PhysRevB.62.1765"],["dc.identifier.isi","000088335600060"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/46082"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physical Soc"],["dc.relation.issn","1550-235X"],["dc.relation.issn","1098-0121"],["dc.title","Scaling properties of one-dimensional Anderson models in an electric field: Exponential versus factorial localization"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","4426"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Physical Review Letters"],["dc.bibliographiccitation.lastpage","4429"],["dc.bibliographiccitation.volume","85"],["dc.contributor.author","Steinbach, F."],["dc.contributor.author","Ossipov, A."],["dc.contributor.author","Kottos, Tsampikos"],["dc.contributor.author","Geisel, Theo"],["dc.date.accessioned","2018-11-07T09:08:11Z"],["dc.date.available","2018-11-07T09:08:11Z"],["dc.date.issued","2000"],["dc.description.abstract","We study the distributions of the resonance widths P(Gamma) and of delay times P(tau) in one-dimensional quasiperiodic tight-binding systems at critical conditions with one open channel. Both quantities are found to decay algebraically as Gamma (-alpha) and tau (-gamma) on small and large scales, respectively. The exponents alpha and gamma are related to the fractal dimension D-0(E) Of the spectrum of the closed system as alpha = 1 + D-0(E) and gamma = 2 - D-0(E). Our results are verified for the Harper model at the metal-insulator transition and for Fibonacci lattices."],["dc.identifier.doi","10.1103/PhysRevLett.85.4426"],["dc.identifier.isi","000165399000004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25968"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","American Physical Soc"],["dc.relation.issn","0031-9007"],["dc.title","Statistics of resonances and of delay times in quasiperiodic Schrodinger equations"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","313"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","EPL"],["dc.bibliographiccitation.lastpage","319"],["dc.bibliographiccitation.volume","69"],["dc.contributor.author","Puhlmann, M."],["dc.contributor.author","Schanz, H."],["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","2005"],["dc.description.abstract","We study the quantum probability to survive in an open chaotic system in the framework of the van Vleck-Gutzwiller propagator and present the first such calculation that accounts for quantum interference effects. Specifically, we calculate quantum deviations from the classical decay after the break time t for both broken and preserved time-reversal symmetry. The source of these corrections is identified in interfering pairs of correlated classical trajectories. In our approach the quantized chaotic system is modelled by a quantum graph."],["dc.identifier.doi","10.1209/epl/i2004-10347-6"],["dc.identifier.isi","000227070200001"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/16258"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0295-5075"],["dc.title","Quantum decay of an open chaotic system: A semiclassical approach"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["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","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"]]