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University of Southampton MalaysiaAbout us

Dr Lim Kok Geng  PhD

Assistant Professor , Lecturer

Dr Lim Kok Geng 's photo

Trained as a theoretical physicist, Dr. Lim Kok Geng obtained his BSc and MSc in physics from University Science of Malaysia (USM) and PhD from 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 physics. His MSc field of research in theoretical high energy physics centred on the gauge field theory in the study of classical magnetic monopoles configuration of SU(2) Yang-Mills-Higgs Theory.

In his PhD study, he had changed his research direction to theoretical condensed matter physics particularly study the phase transition in ferroelectric superlattices using Landau-Ginzburg theory. Currently, he is working on the phenomenological study on ferroelectrics and ferroic materials, ferroelectric heterostructures and superlattices, multiferroics.

Research interests

  • Ferroelectrics and ferroic materials
  • Landau-Ginzburg theory
  • Yang-Mills-Higgs theory Coatings
  • General Relativity

Research Areas:

  • Physics
  • Material Science

 

Title: Phenomenological studies of compositionally graded ferroelectric superlattices (open for PhD application)

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 meet 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 meet 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 capacitor et al.

 

Title: Dyonic wormhole in Einstein-Yang-Mills-Higgs theory (open for PhD application)

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 as 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 possess the YMH hair in the presence of gravity [Phys. Rev. D 102, 124068 (2020)]. 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 holes 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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