Andrea Cavalleri: Publications

Charge density wave dynamics from ultrafast XUV ARPES

EPJ Web of Conferences 41 (2013)

Authors:

JC Petersen, S Kaiser, N Dean, A Simoncig, HY Liu, AL Cavalieri, C Cacho, ICE Turcu, E Springate, F Frassetto, L Poletto, SS Dhesi, H Berger, A Cavalleri

Abstract:

Ultrafast angle-resolved XUV photoemission reveals the time- and momentum-dependent electronic structure of 1T-TaS2, a hybrid Mott and charge-density-wave insulator. Both electronic orderings melt well before the lattice responds, suggesting that electronic correlations play a role not just in the Mott localization but in the CDW ordering as well. © Owned by the authors, published by EDP Sciences, 2013.

Measuring 3D magnetic correlations during the photo-induced melting of electronic order in La0.5Sr1.5MnO4

EPJ Web of Conferences 41 (2013)

Authors:

RI Tobey, S Wall, M Först, H Bromberger, V Khanna, JJ Turner, W Schlotter, M Trigo, O Krupin, WS Lee, YD Chuang, R Moore, AL Cavalieri, SB Wilkins, H Zeng, JF Mitchell, SS Dhesi, A Cavalleri, JP Hill

Abstract:

Time-resolved x-ray diffraction measures the dynamics of antiferromagnetic correlations by reconstructing the reciprocal-space scattering volume for the magnetic Bragg peak. Modifications in the scattering line shape along the three principal reciprocal lattice directions are measured. © Owned by the authors, published by EDP Sciences, 2013.

Preface to special topic: Intense terahertz sources for time-resolved studies of matter

Review of Scientific Instruments 84:2 (2013)

Authors:

H Wen, KJ Kim, A Zholents, J Byrd, A Cavalleri

Nonlinear thz optics in cuprate superconductors

CLEO: Science and Innovations, CLEO_SI 2013 (2013)

Abstract:

Intense THz pulses are used to drive cuprate superconductors. The deformation of the gauge invariant order parameter phase leads to non-dissipative quantum plasmonics, THz Josephson oscillations and excitation of Josephson plasma solitons. OCIS codes: (190.0190)) (190.6135) (190.7110). CLEO:2013 Technical Digest © OSA 2013.

Optical excitation of Josephson plasma solitons in a cuprate superconductor

Nature Materials 12:6 (2013) 535-541

Authors:

A Dienst, E Casandruc, D Fausti, L Zhang, M Eckstein, M Hoffmann, V Khanna, N Dean, M Gensch, S Winnerl, W Seidel, S Pyon, T Takayama, H Takagi, A Cavalleri

Abstract:

Josephson plasma waves are linear electromagnetic modes that propagate along the planes of cuprate superconductors, sustained by interlayer tunnelling supercurrents. For strong electromagnetic fields, as the supercurrents approach the critical value, the electrodynamics become highly nonlinear. Josephson plasma solitons (JPSs) are breather excitations predicted in this regime, bound vortex-antivortex pairs that propagate coherently without dispersion. We experimentally demonstrate the excitation of a JPS in La1.84Sr 0.16CuO4, using intense narrowband radiation from an infrared free-electron laser tuned to the 2-THz Josephson plasma resonance. The JPS becomes observable as it causes a transparency window in the opaque spectral region immediately below the plasma resonance. Optical control of magnetic-flux-carrying solitons may lead to new applications in terahertz-frequency plasmonics, in information storage and transport and in the manipulation of high-Tc superconductivity. © 2013 Macmillan Publishers Limited. All rights reserved.

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