Francisco Guzmán

Stabilization of charged domains in ferroelectric BiFeO3 nanoneedles

Francisco Guzmán, Christopher Addiego, Aiden Ross, Moaz Waqar et autres

Abstract Stabilizing ferroelectric domain configurations is critical to driving the exploration of the fundamental physics and governing principles of domain formation in ferroelectrics. Charged domain walls have attracted interest in nanoelectronics due to their high conductivity but are usually not utilized due …

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Defect‐Mediated Polarization Stabilization Mechanism in Metal‐Ferroelectric Interfaces

Chaojie Du, Francisco Guzmán, Z Q Wang, Toshihiro Aoki et autres

ABSTRACT Ferroelectric oxide heterostructures provide a versatile foundation for functional electronics, yet their performance is often hindered by the difficulty of manipulating domain states in ferroelectric films. Understanding the coupling between interfacial defects and polarization stability remains a central challenge for nanoscale …

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The Genealogical Relationship Between Trivial and Nontrivial Domains in Ferroelectric PbTiO3 Film System

Fenghui Gong, Y T Huang, Xiaowang Wang, Zihao Qin et autres

In recent years, a variety of nontrivial topological structures discovered in ferroelectric PbTiO3/SrTiO3 (PTO/STO) system have attracted significant research interest. These structures, including skyrmions [1-3], vortices, merons, hopfions, dipole waves [4, 5], and flux-closures [6], hold great promise for integration into ferroelectric …

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Defect-Induced Phonon Redistribution at Semiconductor Heterointerfaces

Zihao Qin, Han-Hsuan Wu, Francisco Guzmán, Fenghui Gong et autres

Wide-bandgap gallium nitride (GaN) is a foundational material platform for high-power electronics and optoelectronics [1-3], where interfacial phonon behaviors play critical roles in thermal transport and device reliability [4,5]. Although thermal boundary resistance at heterogeneous interfaces has been extensively studied at the …

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Ternary-containing Al 0.7 InAsSb digital alloys on InP and InP-on-Si [Invited]

Ellie Y. Wang, Francisco Guzmán, Moaz Waqar, Amy Liu et autres

Al x In 1−x As y Sb 1−y is a promising multiplier for avalanche photodiodes (APD) on InP for near-infrared applications. In this work, we investigated the potential of two different ternary-containing layer stacks for the growth of AlInAsSb digital alloys on …

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Exploring Intergrowth Formation in Superconductor YBaCuO7-δ Thin Films

Francisco Guzmán, Levi Brown, Sreekar Vattipalli, Ronghai Qu et autres

Cuprate superconductors, particularly YBaCuO7-δ (YBCO), have attracted interest as high-temperature superconductors. However, strain in cuprate thin films poses challenges to their superconductivity property and their practical applications [1,2,3] . In YBCO, the superconducting current is along the Cu-O planes, resulting in anisotropic …

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Characterization of Ferroelectric Oxide-based Devices with Large Pockels Effect Using Advanced STEM

Yiwei Ju, Yifeng Huang, Moaz Waqar, Chaojie Du et autres

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Phonon modes and electron–phonon coupling at the FeSe/SrTiO3 interface

Hongbin Yang, Yinong Zhou, Guangyao Miao, Ján Rusz et autres

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Ferroelastic Charged Domains in Ferroelectric BiFeO3 Nanoneedles

Francisco Guzmán, Christopher Addiego, Moaz Waqar, Aiden Ross et autres

Charged domain walls (CDWs) in ferroelectrics have attracted interest in nanoelectronics due to their higher conductivity in comparison to neutral domain walls [1]. However, the study of CDWs is challenging due to their inherent instability. Typically, charged compensation mechanisms such as oxygen …

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Phase Coexistence in Multiferroic BiFeO3 Nano-needles Driven by Surface Boundary Conditions.

Francisco Guzmán, Christopher Addiego, Moaz Waqar, Xiaoqing Pan

The coexistence of different phases along a morphotropic phase boundary (MPB) enhances dielectric/piezoelectric response in ferroelectric materials. This enhancement is favorable for probe-based memory data storage and actuator applications [1]. To date, phase coexistence in oxide materials along an MPB has been …

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Observation of Polarization Enhancement at BiFeO3/ La0.7Sr0.3MnO3 Interface

Chaojie Du, Francisco Guzmán, Hongbin Yang, Moaz Waqar et autres

The interest in the ferroelectric tunnel junction (FTJ) continues to grow because of its prominent role in nanotechnology. One type of FTJ is a device consistis of an ultra-thin ferroelectric film sandwiched between two electrodes. Numerous theoretical and experimental studies explored the …

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Studying the interface between croconic acid thin films and substrates using a slow positron beam

D. E. Peterson, Jiandang Liu, Francisco Guzmán, Jonas Etzweiler et autres

Croconic acid (CA) is the first organic ferroelectric with a spontaneous polarity in bulk samples comparable to its inorganic counterparts. As a natural extension of study, ultrathin CA films (∼nm scale) were investigated to reveal ferroelectric effects in films on different substrates …

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