Xiaoxing Xi
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View article: A universal method for precise in situ control of stoichiometry and termination of epitaxial perovskite thin films
A universal method for precise in situ control of stoichiometry and termination of epitaxial perovskite thin films Open
The perovskite ABO3 structure forms the basis for a wide range of functional and quantum materials discussed in the literature, although applications so far have been limited in part because accurate control of film stoichiometry and the a…
View article: MgB$_{2}$ Coating by HPCVD for 1.3-GHz Superconducting RF Cavities
MgB$_{2}$ Coating by HPCVD for 1.3-GHz Superconducting RF Cavities Open
While MgB2 possesses promising material parameters for SRF cavities with higher Q, higher gradient, and higher operation temperatures than Nb cavities, such cavity properties have not been demonstrated using MgB2. As part of a continuing e…
View article: Energy Frontier Research Centers: Center for the Computational Design of Functional Layered Materials (CCDM) August 1, 2014 - July 31, 2018; Center for Complex Materials from First Principles (CCM) August 1, 2018 - July 31, 2021 (Final Report)
Energy Frontier Research Centers: Center for the Computational Design of Functional Layered Materials (CCDM) August 1, 2014 - July 31, 2018; Center for Complex Materials from First Principles (CCM) August 1, 2018 - July 31, 2021 (Final Report) Open
The mission of the DOE Energy Frontier Research Centers CCDM (2014-2018) and CCM (2018-2021) was to theoretically develop, computationally apply, and experimentally validate electronic structure methods for all materials, with a focus on t…
View article: Ultra-thin Epitaxial MgB2 on SiC: Substrate Surface Polarity Dependent Properties
Ultra-thin Epitaxial MgB2 on SiC: Substrate Surface Polarity Dependent Properties Open
High quality, ultrathin, superconducting films are required for advanced devices such as hot-electron bolometers, superconducting nanowire single photon detectors, and quantum applications. Using Hybrid Physical-Chemical Vapor Deposition (…
View article: Spectroscopic Evidence of a Dimensionality-Induced Metal-to-Insulator Transition in the Ruddlesden–Popper La<sub><i>n</i>+1</sub>Ni<sub><i>n</i></sub>O<sub>3<i>n</i>+1</sub> Series
Spectroscopic Evidence of a Dimensionality-Induced Metal-to-Insulator Transition in the Ruddlesden–Popper La<sub><i>n</i>+1</sub>Ni<sub><i>n</i></sub>O<sub>3<i>n</i>+1</sub> Series Open
Perovskite-based heterostructures have recently gained remarkable interest, thanks to atomic-scale precision engineering. These systems are very susceptible to small variations of control parameters, such as two-dimensionality, strain, lat…
View article: Proximity-Induced Superconductivity in Monolayer MoS<sub>2</sub>
Proximity-Induced Superconductivity in Monolayer MoS<sub>2</sub> Open
Proximity effects in superconducting normal (SN) material heterostructures with metals and semiconductors have long been observed and theoretically described in terms of Cooper pair wave functions and Andreev reflections. Whereas the semic…
View article: The Effects of Atomic-Scale Strain Relaxation on the Electronic Properties of Monolayer MoS<sub>2</sub>
The Effects of Atomic-Scale Strain Relaxation on the Electronic Properties of Monolayer MoS<sub>2</sub> Open
The ability to control nanoscale electronic properties by introducing macroscopic strain is of critical importance for the implementation of two-dimensional (2D) materials into flexible electronics and next-generation strain engineering de…
View article: Quantifying Wavelength-Dependent Plasmonic Hot Carrier Energy Distributions at Metal/Semiconductor Interfaces
Quantifying Wavelength-Dependent Plasmonic Hot Carrier Energy Distributions at Metal/Semiconductor Interfaces Open
Hot carriers generated from the nonradiative decay of localized surface plasmons are capable of driving charge-transfer reactions at the surfaces of metal nanostructures. Photocatalytic devices utilizing plasmonic hot carriers are often ba…
View article: Magnesium Diboride thin Films, multilayers, and coatings for SRF cavities
Magnesium Diboride thin Films, multilayers, and coatings for SRF cavities Open
Superconducting radio frequency (SRF) cavities currently use low-temperature superconductor niobium, and the Nb SRF cavities have approached the performance levels predicted theoretically. Compared to Nb, MgB2 becomes superconducting at a …
View article: Enhancement of spin-lattice coupling in nanoengineered oxide films and heterostructures by laser MBE
Enhancement of spin-lattice coupling in nanoengineered oxide films and heterostructures by laser MBE Open
The objective of the proposed research is to investigate nanoengineered oxide films and multilayer structures that are predicted to show desirable properties. The main focus of the project is an atomic layer-by-layer laser MBE (ALL-Laser M…
View article: Strain-Engineered Oxygen Vacancies in CaMnO<sub>3</sub> Thin Films
Strain-Engineered Oxygen Vacancies in CaMnO<sub>3</sub> Thin Films Open
We demonstrate a novel pathway to control and stabilize oxygen vacancies in complex transition-metal oxide thin films. Using atomic layer-by-layer pulsed laser deposition (PLD) from two separate targets, we synthesize high-quality single-c…
View article: Hybrid Physical Chemical Vapor Deposition of Magnesium Diboride Inside 3.9 GHz Mock Cavities
Hybrid Physical Chemical Vapor Deposition of Magnesium Diboride Inside 3.9 GHz Mock Cavities Open
Magnesium diboride (MgB2) is considered a candidate for the next generation superconducting radio frequency (SRF) cavities due to its higher critical temperature Tc (40 K) and increased superheating field (Hsh) compared to other convention…
View article: Epitaxial strain and its relaxation at the LaAlO3/SrTiO3 interface
Epitaxial strain and its relaxation at the LaAlO3/SrTiO3 interface Open
A series of LaAlO3 thin films with different thicknesses were deposited by pulsed laser deposition at temperatures from 720 °C to 800 °C. The results from grazing incidence x-ray diffraction and reciprocal space mapping indicate that a thi…