Peter Zalden

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The study of metal-insulator transitions (MITs) in crystalline solids is a subject of paramount importance, both from the fundamental point of view and for its relevance to the transport properties of materials. Recently, a MIT governed by disorder was observed in crystalline phase-change materials. Here we report on calculations employing density(More)
Ultrathin semiconductors on metals constitute color filters, which selectively absorb wavelength ranges of incident light. This paper demonstrates that these coatings are attractive for tunable color devices by reversibly switching ultrathin phase-change materials on gold between two colors with femtosecond laser pulses. The optical contrast is enhanced(More)
Recently, phase-change materials (PCMs) have gained a lot of interest in the field of active metamaterials and plasmonics due to their switchable optical properties. In the infrared spectral range the huge contrast in the refractive index between an amorphous and a crystalline phase can be employed for nonvolatile tuning of nanoantenna or metasurface(More)
F. Chen,1,2 Y. Zhu,3 S. Liu,4,5 Y. Qi,4 H. Y. Hwang,6 N. C. Brandt,6 J. Lu,6 F. Quirin,7 H. Enquist,8 P. Zalden,2 T. Hu,9 J. Goodfellow,9 M.-J. Sher,9,2 M. C. Hoffmann,10 D. Zhu,10 H. Lemke,10 J. Glownia,10 M. Chollet,10 A. R. Damodaran,11 J. Park,12 Z. Cai,3 I. W. Jung,13 M. J. Highland,14 D. A. Walko,3 J. W. Freeland,3 P. G. Evans,12 A. Vailionis,15 J.(More)
Michael J. Shu, Peter Zalden, Frank Chen, Ben Weems, Ioannis Chatzakis, Feng Xiong, Rakesh Jeyasingh, Matthias C. Hoffmann, Eric Pop, H.-S. Philip Wong, Matthias Wuttig, and Aaron M. Lindenberg Department of Applied Physics, Stanford University, Stanford, California 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator(More)
Two-dimensional materials are subject to intrinsic and dynamic rippling that modulates their optoelectronic and electromechanical properties. Here, we directly visualize the dynamics of these processes within monolayer transition metal dichalcogenide MoS2 using femtosecond electron scattering techniques as a real-time probe with atomic-scale resolution. We(More)
Terahertz pulses are applied as an all-optical bias to ferroelectric thin-film BiFeO3 while monitoring the time-dependent ferroelectric polarization through its nonlinear optical response. Modulations in the intensity of the second harmonic light generated by the film correspond to on-off ratios of 220× gateable on femtosecond timescales. Polarization(More)
and amorphous GeSbTe thin films M. J. Shu, I. Chatzakis, Y. Kuo, P. Zalden, and A. M. Lindenberg Department of Applied Physics, Stanford University, Stanford, California 94305, USA Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA Department of Electrical Engineering, Stanford(More)
Phase-change materials are technologically important due to their manifold applications in data storage. Here we report on ab initio molecular dynamics simulations of crystallization of the phase change material Ag4In3Sb67Te26 (AIST). We show that, at high temperature, the observed crystal growth mechanisms and crystallization speed are in good agreement(More)