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Nanyang Technology University

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Spintronics

This category covers:

Multiferroics
Nanoscale Spintronics
Spintronics and Magnetism
Spintronics and Nanomaterials

Related Links:
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences
Institute of Advanced Studies

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Name	Research Interests
Asst Prof Chen Lang	Dr. Chen has worked on ferroic systems including ferroelectrics and multiferroic thin films. He initiated the projects of making nanostructured NIM heterostructures using ferroelectrics and multiferroics. He is also interested with other functional thin films & devices.
Assoc Prof Christopher Shearwood	Assoc Prof Christopher Shearwood main research focus are in the area of MEMS, BIOMEMS, sensors and actuators although he has also accumulated experience in transdermal drug delivery, spintronics, thin film magnetism, x-ray topography, electron and ion beam lithography, shape memory alloys, and nano-metals. He has published over 40 top quality international journal papers, as well as numerous conference papers, book chapters, and patents.
Assoc Prof Dong Zhili	Dr. Dong has more than twenty years experience in transmission electron microscopy and X-ray diffraction of materials. His research interests include open-framework materials, nanostructured functional materials, advanced coatings and materials synthesis.
Assoc Prof Fan Weijun	His research interests include semiconductor band structure calculations by using effective mass theory, the first-principles method and empirical pseudopotential method (EPM); Compound semiconductor material growth, characterizations and device fabrications; Si photonics; Spintronics.
Assoc Prof (Adj) Goh Kia Liang Gregory	Prof. Goh's expertise is in hdyrothermal synthesis, film and nanostructure growth a epitaxy. His current research interests include: * Growth of TiO2 films for spintronic and photocatalytic applications * Hydrothermal synthesis of lead-free piezoelectrics * Inorganic photovoltaic materials * Low temperature solution epitaxy of ZnO films and nanostructures
Prof Huan Cheng Hon, Alfred	Alfred Huan's research interests lie primarily in surface science and spectroscopy. He has published over 180 papers in international refereed journals and 1 book chapter, with a current H-index of 19 and citation rate of 7.92. He has been the PI of several research grants awarded by Ministry of Education and A*STAR, with total exceeding S$4 million. He serves on the editorial board of a new journal (Research Letters in Physics), and is a member of the Programme Committees for the ICMAT and VASSCAA conference series
Assoc Prof Ivan Shelykh	Quantum and nonlinear optics BEC in condensed matter systems Quantum many body theory Mesoscopic transport
Asst Prof Lew Wen Siang	Dr Lew's areas of expertise are spintronic devices, nanoscale magnetism, and bio magnetic sensors.
Asst Prof (Adj) Quek Su Ying	The focus of my research group is ‘Materials Design for Next Generation Electronics, Spintronics and Thermoelectrics’. With Moore’s law and advances in nanoscale materials synthesis, next generation devices will be one million times smaller than a mosquito. Charge transport at such length scales is fundamentally different from that in present-day macroscopic devices. We use first principles approaches (i.e. approaches with well-defined approximations but no adjustable parameters) to make predictions on the electronic structure and transport properties of different material systems, such as graphene, topological insulators and single-molecule junctions. The uniqueness of our approach is that we can combine many-electron theories with mean-field theories into a practical and predictive tool to predict transport properties in nanoscale systems. We also work closely with experimentalists to understand experimental observations and guide experiments.
Assoc Prof Raju Vijayaraghavan Ramanujan	Nanomaterials are the focus of research work in Ramanujan?s group, especially magnetic and thermoelectric nanomaterials for energy, bioengineering, information storage and defense applications. Processing, characterization and property measurements are carried out in his group (presently 8 graduate students and 3 Research Fellows). Recent PhD theses include: Characterization and processing of cobalt based magnetic nanomaterials (Li Huafang),Microstructural evolution and processing of melt spun and mechanically alloyed Fe-Ni-B-Mo nanomagnetic materials (Du Siwei), Alloying effects on nanostructure formation in iron based soft magnetic materials (Yanrong Zhang) and Directed self assembly of patterned magnetic nanostructures (A. Srivastava). A strong emphasis is placed on electron microscopy and phase transformations are used as an important tool to tailor the microstructure. A bioengineering project, in collaboration with SingHealth, aims to develop magnetic nanoparticles for human liver cancer treatment. Synthesis of magnetic nanoparticles, coating these particles with a suitable polymer and cancer drug, followed by in-vitro and in-vivo testing of the coated particles is being carried out. MRI imaging is being used as an investigative tool in this work. Microelectronic reliability issues, e.g., stress-induced diffusive voiding in microelectronic materials are being studied. Magnetocaloric materials for energy applications, patterned nanostructures for ultra high density data storage media, giant energy product exchange coupled magnetic nanomaterials and nanomaterials for artificial muscles, targeted drug delivery and gene delivery are topics of ongoing research.
Prof Shen Zexiang	Prof Shen's areas of expertise are Raman spectroscopy and microscopy, Nano Science and Nano Technology, near-field optics, spintronics and strain characterzation of Si devices. His current research works focus on near-field Raman microscopy, Plasmonics, nano materials and devices, graphene and nanosphere lithography.
Asst Prof Sum Tze Chien	My research interests are on the development and application of time-resolved and time-integrated optical spectroscopy techniques to study a broad range of emergent nanoscale and light harvesting systems. Specifically, I focus on investigating light matter interactions; energy and charge transfer mechanisms; and probing carrier and quasi-particle dynamics in these systems. Broadly, I can categorize my group’s efforts in three main areas: (a) nanomaterials nanophotonics; (b) mixed dimension heterostructures; and (c) organic photovoltaics (OPV) and plasmonic OPV. 1. Nanomaterials Nanophotonics One of the longest on-going project is on investigating the carrier and quasi-particle dynamics in Semiconducting Nanostructures Nanophotonics. We have worked on a range of systems – ZnO nanowires, CdS nanowires and nanobelts, ZnSe nanowires, ZnTe nanowires and nanobelts etc. New insights were gained in these studies – for example, (1) in one study involving ZnO nanowires, we established that the fast trapping of carriers to the green-emission related centers is through an ultrafast excitonic Auger recombination mechanism; (2) in another project on Cu-doped ZnO, we verified the charge transfer times from the ZnO host to the Cu subsystem occurs within 39 ps to form an “intermediately bound exciton” that is reponsible for the Green Emission in Cu-doped ZnO; (3) A depiction of semiconductor nanowires under lasing action with single photon excitation (SPE) vs two photon excitation (TPE). The commonly accepted paradigm that the higher pump intensities needed for TPE would correspond to higher exciton density threshold (nth) for two-photon pumped lasing is re-examined by Tze-Chien Sum and co-workers using femtosecond time-resolved spectroscopy. Our results show that a much lower nth is needed to achieve lasing in single ZnSe nanowires with TPE compared to SPE. This finding has significant implications for the photo-stability and durability of nanowire lasing. (4) recently, in a project involving CdS nanowires, we developed a new method for tailoring the nanowire lasing modes utilizing the intrinsic self absorption via the Urbach tail states etc. This work is published in Nanoletters. 2. Mixed Dimension Heterostructures In this project, we focus on controlling the light harvesting and light emission properties of novel CdSe dot/CdS nanorod heterostructures (a system of mixed dimensionality). This is achieved through a good understanding the optical properties and charge transfer dynamics in these nanoheterostructures. Utilizing the CdS shell as an antenna for light harvesting and the quantum confinement afforded by the size of the dot, our group has been able to achieve ultralow threshold lasing over a range of emission wavelengths. This ultralow threshold is achieved through the large absorption cross-sections and suppressed Auger recombination rates in these nano-heterostructures. This work is published in ACSNano. 3. Organic Photovoltaics (OPV) and Plasmonic OPV In this work, we seek to understand energy transfer mechanisms in hybrid organic photovoltaic devices, in particular that of the exciton and polaron dynamics resulting from interchain effects under device conditions (field-induced changes in the optical behaviour). Systems include hybrid Au nanowire/P3HT-PCBM photovoltaic devices and fiber-P3HT-PCBM systems. The recombination pathways will be investigated using both time-resolved photoluminescence and transient absorption spectroscopy. The knowledge gained would serve to guide the design of such organic materials inimproving the PCE through chemical and structural modifications. One recent highlight is the acceptance of our paper on investigating the loss mechanisms in Ag nanoparticle blended OPV cells in Nature Communications.
Assoc Prof Tang Xiaohong	. Compound semiconductors and photonic devices. . Metal organic vapor phase epitaxy. . Nanophotonics and nanoelectronics: materials, physics and devices. . Heterogeneous epitaxy growth of compound semiconductors on silicon substrate. . Semiconductor quantum dot, nanowire photonics and electronics.
Assoc Prof Thirumany Sritharan	Prof Sritharan's research expertise are in the areas of experimental processing and characterization of ceramics and metallics with focus on (a) multiferroic ceramic thin films, (b) barrier layers and inerface phenomena, and (c) nanostructured magnetic materials. His current projects are in the development of mutliferroic materials with magnetoelectric coupling for applications in spintronics, Ru-based diffusion barrier layers for Cu metallization, interface interactions in electronic packages, and the effects of nanostructure on the magnetic properties.
Assoc Prof Wang Junling	My research focuses on the study of complex oxide systems. Through materials processing, structural analysis and electrical/magnetic characterizations, we try to understand the fundamental physics and develop new materials for the next generation nano-technology, including environmental friendly lead-free ferroelectric/ piezoelectric systems and spintronics related materials.
Asst Prof Wang Lan	Spintronics Magnetism
Assoc Prof Zhao Yang	Miniaturization of electronic and mechanical devices over the past century has brought immeasurable impact onto human lives. Commercial microelectromechanical systems have reached micron scales, and bona fide molecular apparatuses began to emerge setting the stage for upcoming integrated nanoelectromechanics. Dr. Zhao and coworkers systematically investigate carbon-nanotube-based oscillators, bearings and rotators via molecular dynamics simulation in order to establish their optimal operating conditions and to facilitate function-oriented designs. In addition, particular attention is paid to utilization of nanomachinery devices as nanolabs to study energy exchanges among various degrees of freedom, ergodicity on energy surfaces, and equipartition as systems relax, and to test fundamental hypotheses of thermodynamics and statistical mechanics. The advent of ultrafast femtosecond laser spectroscopy brings about intense research interest in relaxation dynamics of photo-excited states in liquids and solids. Newly-arrived technological capabilities to control femtosecond pulse durations and down-to-one-hertz bandwidth resolutions provide novel probes on vibrational dynamics and excitation relaxation. Dr. Zhao and coworkers formulate time-dependent polaronic wave functions that facilitate microscopic modelling of photo-generated excitation relaxation and realistic computation of various third-order optical response functions, and help to achieve a satisfactory comparison between theory and experiment. Carbon nanotubes are attractive candidates for a variety of applications thanks to their remarkable physical, chemical, and mechanical properties. Optical absorption and fluorescence spectroscopy measurements have become an important tool for structure-based characterization and DNA-assisted manipulation of carbon nanotubes. Dr. Zhao and coworkers establish visual, intuitive connections between optical absorption line shapes and their underlying nanotube structures, which are scrutinized by more sophisticated semi-empirical and DFT calculations.

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