Quantum Revivals in Periodically Driven Systems close to nonlinear resonance

We calculate the quantum revival time for a wave-packet initially well localized in a one-dimensional potential in the presence of an external periodic modulating field. The dependence of the revival time on various parameters of the driven system is shown analytically. As an example of application of our approach, we compare the analytically obtained values of the revival time for various modulation strengths with the numerically computed ones in the case of a driven gravitational cavity. We show that they are in very good agreement.Comment: 14 pages, 1 figur

The Fermi accelerator in atom optics

We study the classical and quantum dynamics of a Fermi accelerator realized by an atom bouncing off a modulated atomic mirror. We find that in a window of the modulation amplitude dynamical localization occurs in both position and momentum. A recent experiment [A. Steane, P. Szriftgiser, P. Desbiolles, and J. Dalibard, Phys. Rev. Lett. {\bf 74}, 4972 (1995)] shows that this system can be implemented experimentally.Comment: 5 pages, 5 figure

Edge-Magnetoplasmon Wave-Packet Revivals in the Quantum Hall Effect

The quantum Hall effect is necessarily accompanied by low-energy excitations localized at the edge of a two-dimensional electron system. For the case of electrons interacting via the long-range Coulomb interaction, these excitations are edge magnetoplasmons. We address the time evolution of localized edge-magnetoplasmon wave packets. On short times the wave packets move along the edge with classical E cross B drift. We show that on longer times the wave packets can have properties similar to those of the Rydberg wave packets that are produced in atoms using short-pulsed lasers. In particular, we show that edge-magnetoplasmon wave packets can exhibit periodic revivals in which a dispersed wave packet reassembles into a localized one. We propose the study of edge-magnetoplasmon wave packets as a tool to investigate dynamical properties of integer and fractional quantum-Hall edges. Various scenarios are discussed for preparing the initial wave packet and for detecting it at a later time. We comment on the importance of magnetoplasmon-phonon coupling and on quantum and thermal fluctuations.Comment: 18 pages, RevTex, 7 figures and 2 tables included, Fig. 5 was originally 3Mbyte and had to be bitmapped for submission to archive; in the process it acquired distracting artifacts, to upload the better version, see http://physics.indiana.edu/~uli/publ/projects.htm

An optically driven quantum dot quantum computer

We propose a quantum computer structure based on coupled asymmetric single-electron quantum dots. Adjacent dots are strongly coupled by means of electric dipole-dipole interactions enabling rapid computation rates. Further, the asymmetric structures can be tailored for a long coherence time. The result maximizes the number of computation cycles prior to loss of coherence.Comment: 4 figure

Quantum phase retrieval of a Rydberg wave packet using a half-cycle pulse

A terahertz half-cycle pulse was used to retrieve information stored as quantum phase in an $N$-state Rydberg atom data register. The register was prepared as a wave packet with one state phase-reversed from the others (the "marked bit"). A half-cycle pulse then drove a significant portion of the electron probability into the flipped state via multimode interference.Comment: accepted by PR

PADF-2. Data for stable isotopes of Ca, Cr, Fe, and Ni

The cross-sections for the interaction of protons with calcium, chromium, iron, and nickel isotopes were obtained at energies from the reaction threshold to 200 MeV. The work included calculations using different models and computer codes, analysis of experimental data, and evaluation of cross sections. For reactions for which no experimental data are available, the cross-sections were estimated by analyzing the calculated data, taking into account the quality and predictive power of various models in different energy ranges. The resulting files can be downloaded from the https://t1p.de/3vzun website

Proton activation data file PADF-2. Targets with atomic numbers from 6 to 15

A new version of the Proton Activation Data File, PADF-2, has been prepared for targets from carbon to phosphorus. The file contains cross-sections of all protoninduced reactions occurring at primary energies up to 200 MeV. The new data were obtained using all available experimental data and results of calculations using modern nuclear models and up-to-date versions of computer codes. A preliminary version of the file can be downloaded at: https://t1p.de/3vzu

Arc-dpa and NRT displacement cross-sections for neutron irradiation of materials from Be to Bi calculated using JEFF-4T1, ENDF/B-VIII, JENDL-5, and TENDL-2021 data

Atomic displacement cross-sections for an advanced assessment of radiation damage rates were calculated for materials from Be to Bi using the arc-dpa model and NRT model, and data from JEFF-4T1 test library, the ENDF/B-VIII, JENDL-5, and TENDL-2021 libraries at neutron incident energies from 10-5 eV to the maximum available energy. Obtained cross-sections were extended to 200 MeV using TENDL-2021 data and earlier TENDL versions. Data prepared in ENDF/B and ACE format are available on the site https://bit.ly/3L8ZlH