Pallavi Saha

Growth and Characterization of GaAs-based Spin-Polarized Photocathodes

Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States), Pallavi Saha, High Energy Physics, Luca Cultrera et autres

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Unconventional Relaxation Dynamics in Co_8Zn_7Mn_5 and Co_8Zn_8Mn_4: Evidence of Inertial Effects

Pallavi Saha, Moirangthem Kiran Singh, P. D. Babu, Subhashree Patnaik

Magnetization relaxation dynamics serve as an essential tool for uncovering the intrinsic mechanisms governing the magnetic response and energy dissipation in magnetic systems. In this work, we examine the relaxation dynamics for Beta Mn type Co_8Zn_7Mn_5 and Co_8Zn_8Mn_4 across a frequency range …

Pulsed laser deposition assisted epitaxial growth of cesium telluride photocathodes for high brightness electron sources

Kali Prasanna Mondal, Mengjia Gaowei, Elena Echeverría, Kenneth Evans‐Lutterodt et autres

The development of high-brightness electron sources is critical to state-of-the-art electron accelerator applications like X-ray free electron laser (XFEL) and ultra-fast electron microscopy. Cesium telluride is chosen as the electron source material for multiple cutting-edge XFEL facilities worldwide. This manuscript presents the …

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A structural analysis of ordered Cs3Sb films grown on single crystal graphene and silicon carbide substrates

C. A. Pennington, Mengjia Gaowei, Elena Echeverría, Kenneth Evans‐Lutterodt et autres

Alkali antimonides are well established as high efficiency, low intrinsic emittance photocathodes for accelerators and photon detectors. However, conventionally grown alkali antimonide films are polycrystalline with surface disorder and roughness that can limit achievable beam brightness. Ordering the crystalline structure of alkali …

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Growth of ultra-flat ultra-thin alkali antimonide photocathode films

W. G. Stam, Mengjia Gaowei, Elena Echeverría, Kenneth Evans‐Lutterodt et autres

Ultra-flat, ultra-thin alkali antimonide photocathodes with high crystallinity can exhibit high quantum efficiency and low mean transverse energy of outgoing electrons, which are essential requirements for a variety of applications for photocathode materials. Here, we investigate the growth of Cs3Sb on graphene-coated …

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Effect of Spin Fluctuations on Magnetoresistance and Anomalous Hall Effect in the Chiral Magnet Co8zn8mn4

Pallavi Saha, Priya Das, Rashmi Rai, S. Patnaik

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Effect of Spin Fluctuations on Magnetoresistance and Anomalous Hall Effect in the Chiral Magnet Co8zn8mn4

Pallavi Saha, Priya Das, M N Singh, Rashmi Rai et autres

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Effect of Spin Fluctuations on Magnetoresistance and Anomalous Hall Effect in the Chiralmagnet Co8zn8mn4

Pallavi Saha, Priya Das, M N Singh, Rashmi Rai et autres

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Ion-beam-assisted growth of cesium-antimonide photocathodes

Pallavi Saha, Eric Montgomery, Shashi Poddar, Oksana Chubenko et autres

We report on the novel use of a Cs+ ion gun for an ion-beam-assisted molecular-beam-epitaxy (IBA-MBE) method to sequentially deposit Cs-Sb cathodes on room temperature substrates as opposed to the standard technique of thermal evaporation on elevated-temperature substrates. The details of the …

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Erratum: “Theory of photoemission from cathodes with disordered surfaces” [J. Appl. Phys. 133, 053102 (2023)]

Pallavi Saha, Oksana Chubenko, J. K. Nangoi, T. A. Arias et autres

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Demonstration of thermal limit mean transverse energy from cesium antimonide photocathodes

Alimohammed Kachwala, Pallavi Saha, P.K. Bhattacharyya, Eric Montgomery et autres

The mean transverse energy (MTE) of electrons emitted from cathodes is a critical parameter that determines the brightness of electron beams for applications, such as x-ray free electron lasers, particle colliders, and ultrafast electron scattering experiments. Achieving a MTE close to the …

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Theory of photoemission from cathodes with disordered surfaces

Pallavi Saha, Oksana Chubenko, J. K. Nangoi, T. A. Arias et autres

Linear-accelerator-based applications like x-ray free electron lasers, ultrafast electron diffraction, electron beam cooling, and energy recovery linacs use photoemission-based cathodes in photoinjectors for electron sources. Most of these photocathodes are typically grown as polycrystalline materials with disordered surfaces. In order to understand …

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