A5062487379- Topological Materials and Phenomena
- Graphene research and applications
- 2D Materials and Applications
- Advanced Condensed Matter Physics
- Quantum and electron transport phenomena
- MXene and MAX Phase Materials
- Physics of Superconductivity and Magnetism
- Multiferroics and related materials
- Magnetic properties of thin films
- Cold Atom Physics and Bose-Einstein Condensates
- Gold and Silver Nanoparticles Synthesis and Applications
- Electronic and Structural Properties of Oxides
- Nanocluster Synthesis and Applications
- Ferroelectric and Negative Capacitance Devices
- Advanced Materials Characterization Techniques
- Electrocatalysts for Energy Conversion
- Iron-based superconductors research
- Advanced Nanomaterials in Catalysis
- Quantum, superfluid, helium dynamics
- Quantum many-body systems
- Electrochemical Analysis and Applications
- Mechanical and Optical Resonators
- Fusion materials and technologies
- Molecular Junctions and Nanostructures
- Advanced battery technologies research
University of the Philippines Diliman
2023-2024
National Sun Yat-sen University
2018-2023
Institute of Physics, Academia Sinica
2021
National Center for Theoretical Sciences
2021
National Tsing Hua University
2021
The zigzag-edged triangular graphene molecules (ZTGMs) have been predicted to host ferromagnetically coupled edge states with the net spin scaling molecular size, which affords large tunability crucial for next-generation spintronics. However, scalable synthesis of ZTGMs and direct observation their long-standing challenges because molecules' high chemical instability. Here, we report bottom-up π-extended [5]triangulene atomic precision via surface-assisted cyclodehydrogenation a rationally...
Spinel oxides (AB2O4) with unique crystal structures have been widely explored as promising alternative catalysts for efficient oxygen evolution reactions; however, developing novel methods to fabricate robust, cost-effective, and high-performance spinel oxide based electrocatalysts is still a great challenge. Here, utilizing complementary experimental theoretical approach, pentavalent vanadium doping in the (i.e., Co3O4 NiFe2O4) has thoroughly investigated engineer their surface enhanced...
Ligand-induced surface restructuring with heteroatomic doping is used to precisely modify the of a prototypical [Au25 (SR1 )18 ]- cluster (1) while maintaining its icosahedral Au13 core for synthesis new bimetallic [Au19 Cd3 (SR2 (2). Single-crystal X-ray diffraction studies reveal that six bidentate Au2 )3 motifs (L2) attached 1 were replaced by three quadridentate Cd(SR2 )6 (L4) create 2. Experimental and theoretical results demonstrate stronger electronic interaction between (Au2 ) core,...
Two-dimensional MXenes continue to receive much research attention owing their versatility and predicted topological phase, which are yet be fully explored. Here, we conduct a rigorous search on ${M}_{2}^{\ensuremath{'}}{M}^{\ensuremath{''}}{\mathrm{C}}_{2}$ $({M}^{\ensuremath{'}}=\mathrm{V}, \mathrm{Nb}, \mathrm{or} \mathrm{Ta};{M}^{\ensuremath{''}}=\mathrm{Ti}, \mathrm{Zr}, \mathrm{Hf})$ with various surface terminations, ${X}_{2}$ $(X=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I},...
Quantum states induced by single-atomic impurities are at the frontier of physics and material science. While such have been reported in high-temperature superconductors dilute magnetic semiconductors, they unexplored topological magnets which can feature spin-orbit tunability. Here we use spin-polarized scanning tunneling microscopy/spectroscopy (STM/S) to study engineered quantum impurity a magnet Co
Topological materials are very promising for technological applications ranging from spintronics to quantum computation. Here, based on first-principles calculations, we predict a family of two-dimensional (2D) topological in nine ternary transition metal chalcogenides (TTMCs) ABX4, where A/B = Zr, Hf, or Ti and X S, Se, Te. A total three compounds (ZrTiTe4, HfZrTe4, HfTiTe4) identified be nontrivial within hybrid functional calculation. The phase originated the p-d band inversion at Г point...
Two-dimensional transition metal dichalcogenides (TMDs) have become well-known due to their versatile and tunable physical properties for potential applications, specifically on low-power optical devices. Here, we explored the structural stability electronic of bulk thin-film (from 1 up 6 layers) structures hafnium (HfX2, X = S, Se, or Te) using first-principles calculations. Our calculations reveal that most stable phase is 1T both thin films bulk. The HfTe2 are semimetallic, while those...
Using combined scanning tunneling microscopy (STM) measurements and first-principles electronic structure calculations, we extensively studied the atomic properties of a $\sqrt{7}$-InBi overlayer on Si(111). We propose demonstrate an effective experimental process to successfully form large well-ordered $\sqrt{7}$ surface by depositing Bi atoms In-Si(111)-$4\ifmmode\times\else\texttimes\fi{}1$ substrate. The STM images exhibit honeycomb pattern. After performing exhaustive computational...
The interplay between unconventional Cooper pairing and quantum states associated with atomic scale defects is a frontier of research many open questions. So far, only few the high-temperature superconductors allow this intricate physics to be studied in widely tunable way. We use scanning tunneling microscopy image electronic impact Co atoms on ground state ${\mathrm{LiFe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}\mathrm{As}$ system. observe that impurities progressively suppress global...
Quantum spin Hall (QSH) insulators with large band gaps and dissipationless edge states are of both technological scientific interest. Although numerous two-dimensional (2D) systems have been predicted to host the QSH phase, very few them harbor retain their nontrivial topology when they deposited on substrates. Here, based a first-principles analysis hybrid functional calculations, we investigated electronic topological properties inversion-asymmetric monolayer copper sulfide (Cu2S)....
Based on first-principles calculations, we systematically investigated a two-dimensional (2D) organometallic framework consisting of metal atoms (elements from groups IIIA, IVA, VA, VIA, IB, and Pt) dicyanobenzenes (DCBs). Our stability analysis showed that the system prefers buckled structure in metals with p-orbital valence electrons, whereas d-orbitals, planar phase is preferable. Topological invariants (Z2) these systems were calculated, they are identified as 2D intrinsic organic...
Abstract Ligand‐induced surface restructuring with heteroatomic doping is used to precisely modify the of a prototypical [Au 25 (SR 1 ) 18 ] − cluster ( while maintaining its icosahedral Au 13 core for synthesis new bimetallic 19 Cd 3 2 ). Single‐crystal X‐ray diffraction studies reveal that six bidentate motifs (L2) attached were replaced by three quadridentate Cd(SR 6 (L4) create . Experimental and theoretical results demonstrate stronger electronic interaction between (Au core, attributed...
The abounding possibilities of discovering novel materials has driven enhanced research effort in the field physics. Only recently, quantum anomalous hall effect (QAHE) was realized magnetic topological insulators (TIs) albeit existing at extremely low temperatures. Here, we predict that MPn (M =Ti, Zr, and Hf; Pn =Sb Bi) honeycombs are capable possessing QAH insulating phases based on first-principles electronic structure calculations. We found HfBi, HfSb, TiBi, TiSb honeycomb systems...
Two-dimensional (2D) Dirac materials have received tremendous attention due to their potential applications in spintronics and energy applications. Motivated by recent experimental synthesis of a carbon nitride network with C22N4 stoichiometry, the N-doped graphdiyne, or pyrazinoquinoxaline-based graphdiyne (PQ-GDY), we studied electronic topological properties PQ-GDY monolayer using first-principles calculations. Surprisingly, found that indeed is 2D semimetal also known as topologically...
A high-quality ${\mathrm{NiTe}}_{2}{\mathrm{O}}_{5}$ single crystal was grown via the flux method and characterized using synchrotron x-ray diffraction (XRD) electron probe microscopy techniques. The dc magnetization $(M)$ confirms antiferromagnetic long-range ordering temperature $({T}_{\mathrm{N}})$ at 28.5 K. An apparent domelike dielectric anomaly near ${T}_{\mathrm{N}}$, with scaling of magnetodielectric (MD) coupling $(\mathrm{MD}%\ensuremath{\propto}{M}^{2})$, signifies higher-order...
The spacetime light cone is central to the definition of causality in theory relativity. Recently, links between relativistic and condensed matter physics have been uncovered, where particles can emerge as quasiparticles energy-momentum space matter. Here, we unveil an analogue by mapping time energy, momentum, Weyl cone. We show that two only interact open a global energy gap if they lie each other's dispersion cones-analogous events causal connection cones. Moreover, demonstrate surface...
Abstract Two-dimensional (2D) materials within the hematene-type binary oxides and perovskites family have recently gathered huge research interest for nanoelectronic devices. However, exploration of their fascinating topological properties remains limited. Herein, through first-principles calculations, we systematically examine electronic, magnetic, substitutionally doped 2D ABO 3 (A=As, Sb, or Bi, B = V, Nb, Ta) perovskite structures at site a 2 O system. Interestingly, atomic substitution...
Quantum states induced by single-atomic-impurities are the current frontier of material and information science. Recently spin-orbit coupled correlated kagome magnets emerging as a new class topological quantum materials, although effect single-atomic impurities remains unexplored. Here we use state-of-the-art scanning tunneling microscopy/spectroscopy (STM/S) to study atomic indium impurity in magnet Co3Sn2S2, which is designed support state. We find each features strongly localized bound...