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Dr Lim Kok Geng  BSc (Hons), MSc, PhD, FHEA, MIPM

Assistant Professor

Dr Lim Kok Geng 's photo

Trained as a theoretical physicist, Dr Lim Kok Geng obtained his BSc and MSc in physics from the University Science of Malaysia (USM) and PhD from the University of Malaya (UM). He graduated with first-class honour and earned a USM Gold Medal Award for the best final-year student in the field of pure physics.

His MSc field of research in theoretical particle physics studied the magnetic monopoles and dyons in the SU(2) Yang-Mills-Higgs field theory. In his PhD study, he switched his research direction to theoretical condensed matter physics particularly studying the phase transition in ferroelectric based on Landau-Ginzburg theory. Focus on the phenomenological study of ferroelectric superlattices, multiferroics and ferroic materials. Recently, he has ventured into the field of theoretical astrophysics, studying wormholes and black holes using general relativity and quantum field theory. 

He was awarded recognition as a Fellow of the Higher Education Academy (FHEA) from Advance HE, UK. He is also a member of the Institute of Physics Malaysia (MIPM). 

Research interests

  • Ferroelectrics and ferroic materials
  • Landau-Ginzburg theory
  • Yang-Mills theory, magnetic monopoles
  • General Relativity
  • Wormholes and black holes

Research Areas:

  • Physics
  • Material Science

 

GENG0019 Fundamentals of Science and Engineering 
GENG0005 Engineering Principles 
GENG0015 Coursework/Computer Applications 

Title: Phenomenological studies of compositionally graded ferroelectric superlattices

Principal Investigator: Dr Kok-Geng Lim

Introduction:

The compositionally graded ferroelectric based on a lead-free solid solution system such as BaxSr1-xTiO3 can exhibit large polarization gradients and desirable temperature-stable susceptibilities. This novel solid solution is not only in compliance with the future lead-free trend but also meets the requirement of a large piezoelectric response of ferroelectrics for modern electronic applications.

Abstract:

The compositionally graded ferroelectric based on a lead-free solid solution system such as BaxSr1-xTiO3 can exhibit large polarization gradients and desirable temperature-stable susceptibilities. This novel solid solution is not only in compliance with the future lead-free trend but also meets the requirement of a large piezoelectric response of ferroelectrics for modern electronic applications. By tailoring their composition at the atomic level, we can manipulate the physical properties and functionalities of compositionally graded ferroelectric. Hence, this research is to develop a thermodynamic model based on the Landau-Ginzburg theory to study the fundamental physical properties of compositionally graded ferroelectric superlattices by considering the interface effect. A theoretical study on the fundamental physical properties is very crucial in the fabrication of compositionally graded ferroelectric superlattices for technological applications, for instance: transducers, high permittivity dielectrics, pyroelectric sensors, piezoelectric devices, tunable ferroelectric capacitors et al.

 

Title: Dyonic wormhole in the Einstein-Yang-Mills-Higgs theory

Principal Investigator: Dr Kok-Geng Lim

Introduction:

Wormholes are hypothetical compact objects that connect two distant regions in the universe which allow time travel or interstellar travel. For instance, the traversable wormhole depicted in Christopher Nolan’s science fiction movie “Interstellar”. The first postulated wormhole in General Relativity (GR) is the Einstein-Rosen (ER) bridge, arising when the structure of spacetime is curved and strongly bent by gravity.

Abstract:

Wormholes are hypothetical compact objects that connect two distant regions in the universe which allow time travel or interstellar travel. For instance, the traversable wormhole depicted in Christopher Nolan’s science fiction movie “Interstellar”. The first postulated wormhole in General Relativity (GR) is the Einstein-Rosen (ER) bridge, arising when the structure of spacetime is curved and strongly bent by gravity. Recently, we have found the non-Abelian wormhole solutions supported by the phantom field in the Einstein-Yang-Mills-Higgs (EYMH) theory, which possesses the YMH hair in the presence of gravity [Phys. Rev. D 102, 124068 (2020), Phys. Rev. D 105, 084058 (2022)]. In flat space, dyon is a particle that possesses both magnetic and electrical charges. In curved spacetime, the EYMH theory also possesses gravitating dyons and dyonic black hole solutions. Hence, it is instructive to study the dyonic wormhole in the EYMH theory.

 

Dr Lim Kok Geng
No. 3, Persiaran Canselor 1,
Kota Ilmu EduCity,
79200 Iskandar Puteri, Johor,
Malaysia

Room Number : 193 USMC/4001

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