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SPS organises a seminar by Yasir Iqbal

SPS organises a seminar by Yasir Iqbal

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SPS organises a seminar by Yasir Iqbal
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School of Physical Sciences

Jawaharlal Nehru University, New Delhi

 

Title : Novel phases of matter in frustrated magnets: the fascinating pyrochlore architecture

 

Speaker: Yasir Iqbal, Department of Physics, IIT Madras  

 


Date:  08– January -2020

Time:   4:00 p.m, Wednesday

Venue: Seminar Room, SPS

 

Abstract : The pyrochlore lattice — a network of corner-sharing tetrahedra — represents one of the most geometrically frustrated lattices as shown by the failure of antiferromagnetically coupled classical Heisenberg spins to develop long-range magnetic order down to zero temperature. On the other hand, the understanding of the role of quantum fluctuations in finite spin-S Heisenberg antiferromagnet represents a critically outstanding problem. I will describe the the pseudo-fermion functional renormalization group framework — a powerful nonperturbative scheme for addressing the low-energy physics of spin Hamiltonians — which has recently been applied by us to unravel the presence of quantum spin liquid behavior as well as intricate magnetic orders in long-range Heisenberg models with small spin-S. I will also present the subtleties associated with capturing the impact of quantum fluctuations, and discuss the unresolved issues. The success of the method in explaining the recently obtained neutron scattering data on the spin-1 NaCaNi2F7 pyrochlore and the spin-1/2 hyperkagome PbCuTe2O6 candidate spin liquid materials will be discussed.

A warm welcome to the modified and updated website of the Centre for East Asian Studies. The East Asian region has been at the forefront of several path-breaking changes since 1970s beginning with the redefining the development architecture with its State-led development model besides emerging as a major region in the global politics and a key hub of the sophisticated technologies. The Centre is one of the thirteen Centres of the School of International Studies, Jawaharlal Nehru University, New Delhi that provides a holistic understanding of the region.

Initially, established as a Centre for Chinese and Japanese Studies, it subsequently grew to include Korean Studies as well. At present there are eight faculty members in the Centre. Several distinguished faculty who have now retired include the late Prof. Gargi Dutt, Prof. P.A.N. Murthy, Prof. G.P. Deshpande, Dr. Nranarayan Das, Prof. R.R. Krishnan and Prof. K.V. Kesavan. Besides, Dr. Madhu Bhalla served at the Centre in Chinese Studies Programme during 1994-2006. In addition, Ms. Kamlesh Jain and Dr. M. M. Kunju served the Centre as the Documentation Officers in Chinese and Japanese Studies respectively.

The academic curriculum covers both modern and contemporary facets of East Asia as each scholar specializes in an area of his/her interest in the region. The integrated course involves two semesters of classes at the M. Phil programme and a dissertation for the M. Phil and a thesis for Ph. D programme respectively. The central objective is to impart an interdisciplinary knowledge and understanding of history, foreign policy, government and politics, society and culture and political economy of the respective areas. Students can explore new and emerging themes such as East Asian regionalism, the evolving East Asian Community, the rise of China, resurgence of Japan and the prospects for reunification of the Korean peninsula. Additionally, the Centre lays great emphasis on the building of language skills. The background of scholars includes mostly from the social science disciplines; History, Political Science, Economics, Sociology, International Relations and language.

Several students of the centre have been recipients of prestigious research fellowships awarded by Japan Foundation, Mombusho (Ministry of Education, Government of Japan), Saburo Okita Memorial Fellowship, Nippon Foundation, Korea Foundation, Nehru Memorial Fellowship, and Fellowship from the Chinese and Taiwanese Governments. Besides, students from Japan receive fellowship from the Indian Council of Cultural Relations.