Browsing by Author "Wall, Simon"

Now showing items 1-12 of 12

    • Attosecond state-resolved carrier motion in quantum materials probed by soft x-ray XANES 

      Buades, Bárbara; Picón, Antonio; Berger, Emma; León, Iker; Palo, Nicola di; Cousin, Seth L.; Cocchi, Caterina; Pellegrin, Eric; Herrero Martin, Javier; Mañas-Valero, Samuel; Coronado, Eugenio; Danz, Thomas; Draxl, Claudia; Uemoto, Mitsuharu; Yabana, Kazuhiro; Schultze, Martin; Wall, Simon; Zürch, Michael; Biegert, Jens (AIP, 2021-03-10)
      Article
      Open Access
      Recent developments in attosecond technology led to table-top x-ray spectroscopy in the soft x-ray range, thus uniting the element- and state-specificity of core-level x-ray absorption spectroscopy with the time resolution ...

    • Does Vo2 host a transient monoclinic metallic phase? 

      Vidas Almohalla, Luciana; Martínez Moreno, Elías; Pérez Salinas, Daniel; Wall, Simon (2020-08-27)
      Article
      Open Access
      Ultrafast phase transitions induced by femtosecond light pulses present a new opportunity for manipulating the properties of materials. Understanding how these transient states are different from, or similar to, their ...

    • Experimental and Theoretical Study of Second Harmonic Generation from an ITO Nanolayer 

      Rodríguez Suñé, Laura; Scalora, Michael; Johnson, Allan; Cojocaru, Crina; Akozbek, Neset; Coppens, Zachary; Pérez Salinas, Daniel; Wall, Simon; Trull Silvestre, José Francisco (Institute of Electrical and Electronics Engineers (IEEE), 2020)
      Conference report
      Restricted access - publisher's policy
      We present an experimental study of second harmonic generation from a 20nm-thick indium tin oxide layer in the proximity of its epsilon-near-zero condition. We report measurements of second harmonic efficiencies as a ...

    • Imaging Nanometer Phase Coexistence at Defects During the Insulator−Metal Phase Transformation in VO2 Thin Films by Resonant Soft X‑ray Holography 

      Vidas, Luciana; Günther, Christian M.; Miller, Timothy A.; Pfau, Bastian; Perez-Salinas, Daniel; Martínez, Elías; Schneider, Michael; Guehers, Erik; Gargiani, Pierluigi; Valvidares, Manuel; Marvel, Robert E.; Hallman, Kent A.; Haglund, Richard F.; Eisebitt, Stefan; Wall, Simon (ACS, 2018-05-16)
      Article
      Open Access
      We use resonant soft X-ray holography to image the insulator−metal phase transition in vanadium dioxide with element and polarization specificity and nanometer spatial resolution. We observe that nanoscale inhomogeneity ...

    • Light control of orbital domains: case of the prototypical manganite La0.5Sr1.5MnO4 

      Miller, Timothy; Gensch, Michael; Wall, Simon (IOP, 2016-11-14)
      Article
      Open Access
      Control of electronic and structural ordering in correlated materials on the ultrafast timescale with light is a new and emerging approach to disentangle the complex interplay of the charge, spin, orbital and structural ...

    • Nanoscale phase separation and pseudogap in the hole-doped cuprates from fluctuating Cu-O-Cu bonds 

      Dauphin, Alexandre; Wall, Simon; Julià Farré, Sergi; Lewenstein, Maciej; Grzybowski, Przemyslaw R; Chhajlany, Ravindra; Grochowski, Piotr (2020-03-10)
      Article
      Open Access
      The pseudogap phenomenology is one of the enigmas of the physics of high-Tc superconductors. Many members of the cuprate family have now been experimentally characterized with high resolution in both real and momentum ...

    • Second harmonic generation from an ITO nanolayer: experiment versus theory 

      Rodríguez Suñé, Laura; Scalora, Michael; Johnson, Allan; Cojocaru, Crina; Akozbek, Neset; Coppens, Zachary; Pérez Salinas, Daniel; Wall, Simon; Trull Silvestre, José Francisco (International Society for Photo-Optical Instrumentation Engineers (SPIE), 2020)
      Conference report
      Open Access
      We report a comparative experimental and theoretical study of second harmonic generation from a 20nm-thick indium tin oxide nanolayer in the proximity of the epsilon-near-zero condition. We record the efficiency of the ...

    • Study of second and third harmonic generation from an indium tin oxide nanolayer: Influence of nonlocal effects and hot electrons 

      Rodríguez Suñé, Laura; Escalora, M.; Johnson, Allan; Cojocaru, Crina; Akozbek, Neset; Coppens, Zachary; Pérez Salinas, Daniel; Wall, Simon; Trull Silvestre, José Francisco (2020-01-03)
      Article
      Open Access
      We report comparative experimental and theoretical studies of the second and third harmonic generation from a 20 nm-thick indium tin oxide layer in proximity of the epsilon-near-zero condition. Using a tunable optical ...

    • Terahertz field control of in-plane orbital order in La0.5Sr1.5MnO4 

      Miller, Timothy A.; Chhajlany, Ravindra W.; Tagliacozzo, Luca; Green, Bertram; Kovalev, Sergey; Prabhakaran, Dharmalingam; Lewenstein, Maciej; Gensch, Michael; Wall, Simon (Nature Publishing Group, 2015-09-18)
      Article
      Open Access
      In-plane anisotropic ground states are ubiquitous in correlated solids such as pnictides, cuprates and manganites. They can arise from doping Mott insulators and compete with phases such as superconductivity; however, their ...

    • Time-domain separation of optical properties from structural transitions in resonantly bonded materials 

      Waldecker, Lutz; Miller, Timothy A.; Rudé, Miquel; Bertoni, Roman; Osmond, Johann; Simpson, Robert E.; Ernstorfer, Ralph; Wall, Simon (Nature Publishing Group, 2015-07-27)
      Article
      Open Access
      The extreme electro-optical contrast between crystalline and amorphous states in phase-change materials is routinely exploited in optical data storage1 and future applications include universal memories2, flexible displays3, ...

    • Transient Attosecond Soft-X-Ray Spectroscopy in Layered Semi-Metals 

      Sidiropolous, T. P.H.; Di Palo, N.; Rivas, D. E.; Severino, S.; Reduzzi, M.; Buades, B.; Leon, I.; Cousin, S. L.; Hemmer, M.; Cocchi, C.; Pellegrin, E.; Herrero Martin, J.; Mañas-Valero, S.; Coronado, E.; Danz, T.; Draxi, C.; Uemoto, M.; Yabana, K.; Schultze, Martin; Wall, Simon; Picon, A.; Biegert, Jens (SPIE, 2020)
      Conference lecture
      Open Access
      X-ray absorption fine-structure (XAFS) spectroscopy is a well-established technique capable of extracting information about a material’s electronic and lattice structure with atomic resolution. While the near-edge region ...

    • Ultrafast disordering of vanadium dimers in photoexcited VO2 

      Wall, Simon; Yang, Shan; Vidas, Luciana; Chollet, Matthieu; Glownia, Michael; Kozina, Michael; Katayama, Tetsuo; Henighan, Thomas; Jiang, Mason; Miller, Timothy A.; Reis, David A.; Boatner, Lynn A.; Delaire, Olivier; Trigo, Mariano (American Association for the Advancement of Science., 2018-11-02)
      Article
      Open Access
      Time-resolved x-ray scattering can be used to investigate the dynamics of materials during the switch from one structural phase to another. So far, methods provide an ensemble average and may miss crucial aspects of the ...