Sebin Joseph Sebastian
Fulbright Scholar | Research Scholar | School of Physics | IISER Thiruvananthapuram
Fulbright Scholar | Research Scholar | School of Physics | IISER Thiruvananthapuram
“ For I know the plans I have for you,” declares the LORD, “plans to prosper you and not to harm you, plans to give you hope and a future.” ( Jeremiah 29:11 )
I am Sebin Joseph Sebastian, born and raised in Thiruvalla, Pathanamthitta, Kerala, India. I am a research scholar (Integrated PhD student since 2018) in the School of Physics at IISER Thiruvananthapuram.
My work primarily focuses on "Quantum Magnetism" in frustrated spin lattices. I have been doing my PhD under the supervision of Prof. Ramesh Chandra Nath since August 2020.
I primarily use magnetization measurements (PPMS, SQUID magnetometer), heat capacity, neutron diffraction, muon spectroscopy, and, most importantly, nuclear magnetic resonance (NMR) experiments.
I am proud to say that I am the recipient of the most prestigious research fellowships in the world as well as in my country:
[1] Fulbright-Nehru Doctoral Scholarship (2024-25)
[2] Prime Ministers Research Fellow (PMRF) (2021-2024).
In the last ten years, experimentalists have become more interested in the interesting magnetic properties of frustrated spin systems, such as quantum spin liquids (QSL), classical spin-liquids, nematic phases, and so on. One of the main goals of our lab, as we continue to study and develop new 3d and 4f systems-based materials, is to understand how these ground states function in quantum systems that interact with each other. Several experimental methods are employed to further characterize the samples' structural, electrical, magnetic, and thermal properties.
Among these extensive categories, spatially anisotropic triangular lattice antiferromagnets are my focus of study. Because exchange interactions are competitive, these systems tend to form either a 1-D spin chain or a 2-D triangular lattice. This difference in exchange interaction makes the ground state features of this anisotropic triangular lattice an intriguing system to study.
In an ideal 3D system, due to finite interlayer interaction, it is difficult to stabilize QSL. On the contrary, certain highly frustrated 3D geometrically frustrated lattices, such as pyrochlore, hyperkagome, and trillium lattices, can stabilize QSLs. Since my search is for identifying spin liquid candidates, I currently explore 3D frustrated lattices with local probe techniques to unveil their spin dynamics at low temperatures.