Physical Review Letters

Evidence of Resonant Surface-Wave Excitation in the Relativistic Regime through Measurements of Proton Acceleration from Grating Targets

Author(s): T. Ceccotti et al.

The interaction of laser pulses with thin grating targets, having a periodic groove at the irradiated surface, is experimentally investigated. Ultrahigh contrast (∼1012) pulses allow us to demonstrate an enhanced laser-target coupling for the first time in the relativistic regime of ultrahigh intens...

[Phys. Rev. Lett. 111, 185001] Published Mon Oct 28, 2013

Coherent-Radiation Spectroscopy of Few-Femtosecond Electron Bunches Using a Middle-Infrared Prism Spectrometer

Author(s): T. J. Maxwell, C. Behrens, Y. Ding, A. S. Fisher, J. Frisch, Z. Huang, and H. Loos

Modern, high-brightness electron beams such as those from plasma wakefield accelerators and free-electron laser linacs continue the drive to ever-shorter bunch durations. In low-charge operation (∼20  pC), bunches shorter than 10 fs are reported at the Linac Coherent Light Source (LCLS). Though suff...

[Phys. Rev. Lett. 111, 184801] Published Mon Oct 28, 2013

Realization of the Hofstadter Hamiltonian with Ultracold Atoms in Optical Lattices

Author(s): M. Aidelsburger, M. Atala, M. Lohse, J. T. Barreiro, B. Paredes, and I. Bloch

We demonstrate the experimental implementation of an optical lattice that allows for the generation of large homogeneous and tunable artificial magnetic fields with ultracold atoms. Using laser-assisted tunneling in a tilted optical potential, we engineer spatially dependent complex tunneling amplit...

[Phys. Rev. Lett. 111, 185301] Published Mon Oct 28, 2013

Realizing the Harper Hamiltonian with Laser-Assisted Tunneling in Optical Lattices

Author(s): Hirokazu Miyake, Georgios A. Siviloglou, Colin J. Kennedy, William Cody Burton, and Wolfgang Ketterle

We expeg laser-assisted tunneling and a primentally implement the Harper Hamiltonian for neutral particles in optical lattices usinotential energy gradient provided by gravity or magnetic field gradients. This Hamiltonian describes the motion of charged particles in strong magnetic fields. Laser-ass...

[Phys. Rev. Lett. 111, 185302] Published Mon Oct 28, 2013

Optimal Quantum-Enhanced Interferometry Using a Laser Power Source

Author(s): Matthias D. Lang and Carlton M. Caves

We consider an interferometer powered by laser light (a coherent state) into one input port and ask the following question: what is the best state to inject into the second input port, given a constraint on the mean number of photons this state can carry, in order to optimize the interferometer’s ph...

[Phys. Rev. Lett. 111, 173601] Published Tue Oct 22, 2013

Transition of Proton Energy Scaling Using an Ultrathin Target Irradiated by Linearly Polarized Femtosecond Laser Pulses

Author(s): I Jong Kim, Ki Hong Pae, Chul Min Kim, Hyung Taek Kim, Jae Hee Sung, Seong Ku Lee, Tae Jun Yu, Il Woo Choi, Chang-Lyoul Lee, Kee Hwan Nam, Peter V. Nickles, Tae Moon Jeong, and Jongmin Lee

Particle acceleration using ultraintense, ultrashort laser pulses is one of the most attractive topics in relativistic laser-plasma research. We report proton and/or ion acceleration in the intensity range of 5×1019 to 3.3×1020  W/cm2 by irradiating linearly polarized, 30-fs laser pulses on 10-to 10...

[Phys. Rev. Lett. 111, 165003] Published Wed Oct 16, 2013

Enhancement of Electron Energy to the Multi-GeV Regime by a Dual-Stage Laser-Wakefield Accelerator Pumped by Petawatt Laser Pulses

Author(s): Hyung Taek Kim, Ki Hong Pae, Hyuk Jin Cha, I Jong Kim, Tae Jun Yu, Jae Hee Sung, Seong Ku Lee, Tae Moon Jeong, and Jongmin Lee

Laser-wakefield acceleration offers the promise of a compact electron accelerator for generating a multi-GeV electron beam using the huge field gradient induced by an intense laser pulse, compared to conventional rf accelerators. However, the energy and quality of the electron beam from the laser-wa...

[Phys. Rev. Lett. 111, 165002] Published Tue Oct 15, 2013

Direct Evidence of Fe^{2+}-Fe^{3+} Charge Ordering in the Ferrimagnetic Hematite-Ilmenite Fe_{1.35}Ti_{0.65}O_{3-δ} Thin Films

Author(s): L. Bocher, E. Popova, M. Nolan, A. Gloter, E. Chikoidze, K. March, B. Warot-Fonrose, B. Berini, O. Stéphan, N. Keller, and Y. Dumont

In this Letter we highlight direct experimental evidence of Fe2+-Fe3+ charge ordering at room temperature in hematite-ilmenite Fe1.35Ti0.65O3-δ epitaxial thin films grown by pulsed laser deposition, using aberration-corrected scanning transmission electron microscopy coupled to high-resolution energ...

[Phys. Rev. Lett. 111, 167202] Published Mon Oct 14, 2013

Proposed Rabi-Kondo Correlated State in a Laser-Driven Semiconductor Quantum Dot

Author(s): B. Sbierski, M. Hanl, A. Weichselbaum, H. E. Türeci, M. Goldstein, L. I. Glazman, J. von Delft, and A. İmamoğlu

Spin exchange between a single-electron charged quantum dot and itinerant electrons leads to an emergence of Kondo correlations. When the quantum dot is driven resonantly by weak laser light, the resulting emission spectrum allows for a direct probe of these correlations. In the opposite limit of va...

[Phys. Rev. Lett. 111, 157402] Published Thu Oct 10, 2013

Two-Pulse Ionization Injection into Quasilinear Laser Wakefields

Author(s): N. Bourgeois, J. Cowley, and S. M. Hooker

We describe a scheme for controlling electron injection into the quasilinear wakefield driven by a guided drive pulse via ionization of a dopant species by a collinear injection laser pulse with a short Rayleigh range. The scheme is analyzed by particle-in-cell simulations which show controlled inje...

[Phys. Rev. Lett. 111, 155004] Published Wed Oct 09, 2013

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