A5045300343- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Electronic and Structural Properties of Oxides
- Iron-based superconductors research
- 2D Materials and Applications
- Magnetic properties of thin films
- Perovskite Materials and Applications
- Rare-earth and actinide compounds
- Superconductivity in MgB2 and Alloys
- Superconducting Materials and Applications
- Graphene research and applications
- Semiconductor materials and devices
- Inorganic Fluorides and Related Compounds
- Organic and Molecular Conductors Research
- Strong Light-Matter Interactions
- Nanowire Synthesis and Applications
- Photonic Crystals and Applications
- ZnO doping and properties
- Surface and Thin Film Phenomena
- Ga2O3 and related materials
- Intellectual Capital and Performance Analysis
- Topological Materials and Phenomena
- Semiconductor Lasers and Optical Devices
- Photonic and Optical Devices
Westlake University
2019-2025
Tongji University
2024-2025
National University of Singapore
2021-2025
Nanyang Technological University
2023-2024
Gannan Normal University
2024
Nantong University
2022-2023
Boston College
2012-2019
OLVG
2019
Xi'an Jiaotong University
2019
Sri Venkateswara Institute of Medical Sciences
2018
This article surveys recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties. The growth ZnO was carried out a simple chemical vapor transport condensation (CVTC) system. Based on our fundamental understanding vapor–liquid–solid (VLS) nanowire mechanism, different levels controls (including positional, orientational, diameter, density control) have been achieved. Power-dependent emission has examined lasing action observed...
Due to the novel optical and optoelectronic properties, 2D materials have received increasing interests for optoelectronics applications. Discovering new properties functionalities of is challenging yet promising. Here broadband polarization sensitive photodetectors based on few layer ReS 2 are demonstrated. The transistor shows an n‐type behavior with mobility about 40 cm V −1 s on/off ratio 10 5 . dependence photoresponse ascribed unique anisotropic in‐plane crystal structure, consistent...
The deterministic growth of different shapes ZnO crystals from nanometer to micrometer scale is reported. Tetrapods (see Figure) and dendrites have been synthesized by simply adjusting the reaction temperature partial pressure oxygen within system. Size control these structures can be achieved. nanoribbons are also easily accessible.
In this supporting material for the main paper (the preceding submission), we show, in addition to related information experiments, additional discussion that cannot fit (due space constraint). It includes further about our experimental observations, wider implications of findings with various reported candidates pseudogap order, and a simple mean-field argument favors interpretations based on finite-Q order (density wave) seen by ARPES (whether "the order" is single or contains multiple...
A detailed phenomenology of low energy excitations is a crucial starting point for microscopic understanding complex materials, such as the cuprate high-temperature superconductors. Because its unique momentum-space discrimination, angle-resolved photoemission spectroscopy (ARPES) ideally suited this task in cuprates, where emergent phases, particularly superconductivity and pseudogap, have anisotropic gap structure momentum space. We present comprehensive doping- temperature-dependence...
ZnO nanoribbons with pseudo‐rectangular cross‐sections (see Figure) are demonstarted to be excellent microcavities a high quality factor (∼ 3000). The lasing threshold is shown inversely proportional the length of ribbon for pumping intensities lower than saturation region. Analysis emission spectra points possibility existence both pure axial modes and “bow‐tie” cavity modes.
We demonstrate the formation of a two-dimensional electron gas (2DEG) at (100) surface 5d transition-metal oxide KTaO3. From angle-resolved photoemission, we find that quantum confinement lifts orbital degeneracy bulk band structure and leads to 2DEG composed ladders subband states both light heavy carriers. Despite strong spin-orbit coupling, our measurements provide direct upper bound for potential Rashba spin splitting only Δk(parallel)}~0.02 Å(-1) Fermi level. The polar nature KTaO3(100)...
Single-crystalline diluted magnetic semiconductor GaN:Mn nanowires with controlled Mn concentrations have been successfully synthesized and incorporated into devices (see Figure). These exhibit Curie temperatures above room temperature, magnetoresistances near spin-dependent transport. The are used as building blocks for the fabrication of GaN:Mn/n-SiC based light-emitting diodes.
We present a detailed angle-resolved photoemission spectroscopy (ARPES) investigation of the $R{\text{Te}}_{3}$ family, which sets this system as an ideal ``textbook'' example for formation nesting driven charge density wave (CDW). This family indeed exhibits full range phenomena that can be associated to CDW instabilities, from opening large gaps on best nested parts Fermi surface (up 0.4 eV), existence residual metallic pockets. ARPES is suited technique characterize these features, thanks...
Several transition-metal dichalcogenides exhibit a striking crossover from indirect to direct band gap semiconductors as they are thinned down single monolayer. Here, we demonstrate how an electronic structure characteristic of the isolated monolayer can be created at surface bulk MoS2 crystal. This is achieved by intercalating potassium in interlayer van der Waals gap, expanding its size while simultaneously doping electrons into conduction band. Our angle-resolved photoemission...
Through a systematic high-resolution angle-resolved photoemission study of the iron pnictide compounds $(\text{Ba},\text{Sr}){\text{Fe}}_{2}{\text{As}}_{2}$, we show that electronic structures these are significantly reconstructed across spin density wave transition, which cannot be described by simple folding scenario conventional ordering. Moreover, find LDA calculations with an incorporated suppressed magnetic moment $0.5{\ensuremath{\mu}}_{\text{B}}$ can match well details in structure,...
We present our angle-resolved photoemission spectroscopy (ARPES) studies of the cuprate high-temperature superconductors; these elucidate relation between superconductivity and pseudogap highlight low-energy quasiparticle dynamics in superconducting state. Our experiments suggest that gap represent distinct states coexist below Tc. Studies Bi-2212 demonstrate near-nodal near-antinodal regions behave differently as a function temperature doping, implying different orders dominate...
Silicon nanowire bridges are grown in prefabricated microtrenches on (110) silicon-on-insulator wafers (see Figure). trenches used as substrates during growth and probing electrodes after growth. This way, device fabrication can be achieved simultaneously, providing a simple rational way to realize nanowire-based integrated circuits.
Atomic force microscopy has been used to characterize the mechanical elasticity of Si nanowires synthesized by vapor-liquid-solid method. The are horizontally grown between two facing Si(111) sidewalls microtrenches prefabricated on a Si(110) substrate, resulting in suspended single and double clamped nanowire-in-trench structures. deflection is induced measured controlled application normal forces with microscope tip. observed reversibility nanowire deflections agreement profiles...
To date, angle-resolved photoemission spectroscopy has been successful in identifying energy scales of the many-body interactions correlated materials, focused on binding energies up to a few hundred meV below Fermi energy. Here, at higher scale, we present improved experimental data from four families high-Tc superconductors over wide doping range that reveal hierarchy interaction on: low anomaly ("kink") 0.03-0.09eV, high 0.3-0.5eV, and an anomalous enhancement width LDA-based CuO2 band...
The body-centered-cubic (bcc) phase of Ni, which does not exist in nature, has been achieved as a thin film on GaAs(001) at 170 K via molecular beam epitaxy. bcc Ni is ferromagnetic with Curie temperature 456 and possesses magnetic moment 0.52+/-0.08 micro(B)/atom. cubic magnetocrystalline anisotropy determined to be +4.0x10(5) ergs x cm(-3), opposed -5.7x10(4) cm(-3) for the naturally occurring face-centered-cubic (fcc) Ni. This sharp contrast attributed different electronic band structures...
We use high-resolution angle-resolved photoemission to study the electronic structure of ${\text{BaFe}}_{2}{\text{As}}_{2}$ pnictides. observe two electron bands and hole near X point, $(\ensuremath{\pi},\ensuremath{\pi})$ Brillouin zone, in paramagnetic state for electron-doped $\text{Ba}{({\text{Co}}_{0.06}{\text{Fe}}_{0.94})}_{2}{\text{As}}_{2}$, undoped ${\text{BaFe}}_{2}{\text{As}}_{2}$, hole-doped ${\text{Ba}}_{0.6}{\text{K}}_{0.4}{\text{Fe}}_{2}{\text{As}}_{2}$. Among these bands,...