Department of Physics

Permanent URI for this communityhttps://ir.nbu.ac.in/handle/123456789/4173

Physics is one of those departments with which North Bengal University started its journey in the year 1962. At present there are nine faculty members and ten non-teaching employees in the department. The department has active research groups in the field of (a) Liquid Crystal, (b) Relativity, Cosmology, and Astrophysics, (c) High-energy Heavy-ion Interaction and Cosmic-ray Physics, and (d) Solid-state devices. Several research projects sponsored by the DST, DAE, UGC, and Tea Research Board are running in the department. In the year 2003 the department received a financial support under the FIST programme from the DST, Govt. of India. The department offers both M.Sc. and Ph.D. courses. A semester system is followed in the M.Sc. level, with three different areas of specialization namely, Condensed Matter Physics, Electronics and Nuclear and Particle Physics, out of which a student can choose one. The annual intake capacity in M.Sc. is 40 students. In the Ph.D. programme of the department right now 25 research students are enrolled under the supervision of different faculty members. Almost all faculty members are involved in intra and inter-university national and international collaborations of scientific research. The department houses one IUCAA Resource Centre, a Data Centre for Observational Astronomy, six teaching laboratories, several research laboratories and one departmental library. From time to time the department organizes Seminars, Symposia, Conferences, Schools, Refresher Courses, and Outreach Programs.

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    Effect of Core and Its Position on the Properties of Fluorinated Nematic Liquid Crystals
    (University of North Bengal, 2025-03) Singha, Biplab Kumar; Debnath, Ashim; Haldar, Sripada
    Five nematic liquid crystal (NLC) compounds have been investigated by polarizing optical microscopy (POM), molecular mechanics and dielectric spectroscopy. Introduction of ethane (– CH2CH2–) bridge, its position, surrounding rings and fluorination were found to influence considerably molecular dipole moment (μ), inclination (β) i.e., frame of reference, dielectric anisotropy (Δε), threshold voltage (Vth), splay elastic constant (K11), relaxation time (τ ) and activation energy (Ea). It is observed that compounds show very lower melting and clearing temperatures. Nematic (N) phase stability is also found to be broader. All compounds show super cooling property near to room temperature except compound 3o2pp-f (N1). Splay elastic constant (K11), an important parameter is found to vary from 10−11 N to 10−10 N. Comparatively lower value of K11, lower value of restoring torque and alternatively faster response can be achieved. Undesirable energy absorption is found in between few hundred kHz to MHz region i.e flip-flop in nature.