Materials Sciences Colloquium

2018

February 22, 2019
Prof. J. Paul Attfield, Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh

Venue & Time: CV Raman Hall at 4:00 PM
 

New Chemistry and Physics in Magnetic Oxides

 

 

January 30, 2019
Prof. A.K. Sood, Department of Physics, Indian Institute of Science, Bangalore

Venue & Time: CV Raman Hall at 3:30 PM
Insights into Quantum Materials by Ultrafast Spectroscopy

Insights into Quantum Materials by Ultrafast Spectroscopy

Ultrafast lasers offer unique possibilities to control and probe transient processes in quantum materials. Following photoexcitation by a femtosecond laser pulse, the carrier dynamics includes many important processes like thermalization, energy relaxation, exciton formation and spin dynamics which are impacted by dimensionality. Their understanding is crucial not only for many optoelectronic applications, but also to gain a deeper understanding of physical processes in materials. My talk will discuss some of our recent work on the dynamics of optical pump induced photocarriers in single and bilayer graphene[1], graphane (hydrogen functionalized graphene)[2], carbon nanotubes[3] and transition metal dichalcogenides[4] as probed by time-resolved terahertz spectroscopy.
Time permitting, the second part of my talk will address ultrafast dynamics in recently discovered 3D analogues of graphene (massless Dirac Fermions in 3D), namely Weyl and Dirac semimetals- NbAs, TaAs and Cd3As2[5].

[1] Srabani Kar, Van Luan Nguyen, Dipti R. Mohapatra, Young Hee Lee and A.K. Sood, Ultrafast Spectral-response of Bilayer Graphene: Optical pump-Terahertz Probe Spectroscopy and Theory. ACS Nano DOI: 10.1021/acsnano.7b08555 (2018)
[2] Srabani Kar, Dipti R. Mohapatra and A.K. Sood, Tunable terahertz photoconductivity of hydrogen functionalized graphene using optical pump-terahertz probe spectroscopy, Nanoscale (2018)
[3] Srabani Kar and A.K. Sood, Ultrafast terahertz photoresponse of single and double- walled carbon nanotubes: Optical pump-terahertz probe spectroscopy. (2018)
[4] S. Kar, Yang Su, Rahul Nair, A.K. Sood, Probing photoexcited carriers in MoS2 laminate by time resolved optical pump terahertz probe spectroscopy. ACS Nano 9, 12004 (2015)
[5] K.P. Mithun et.al (2019)

January 07, 2019
Professor Satyajit Mayor, Director, National Centre for Biological Sciences, (TIFR), Bangalore, India

Venue & Time: CV Raman Hall at 3:00 PM
Life at the Cell's edge; the active membrane bilayer

Life at the Cell's edge; the active membrane bilayer

The plasma membrane of the living cell acts as an interface between the cell and its external milieu and serves as a dynamic conduit for information transduction. It is composed of membrane lipids and protein in the form of a fluid bilayer. At the same time the cell membrane is a highly organized system, with specific components in states that are far away from chemical equilibrium. Imaging the local organization of membrane components suggeststhat the active mechanics of dynamic cortical actin filaments facilitates the creation of these states, resulting in active actin-membrane composite, The dynamic actin participates in generating localized domains in the membrane. Signalling receptors embedded in the membrane regulatethe molecular machinery necessary for the generation of the dynamic actin.This has functional consequences for membrane receptor function and provides insights into how this active organization may inform the generation of a living cell membrane.

 

  Upcoming Seminars/Meetings

  • Seesaw determination of the dark matter relic density
  • Title: Seesaw determination of the dark matter relic density
    Speaker: Dr. Aritra Gupta, University Libre de Bruxelles (ULB), Belgium
    Date: November 02, 2022 (Wednesday)  
    Time: 16:00 hours (IST)
    Venue: Physics Seminar Room (C-406), 3rd Floor, Centenary Building, IACS
  • Single-Shot Determination of Quantum Phases via Continuous Measurements
  • Title : Single-Shot Determination of Quantum Phases via Continuous
    Measurements
    Speaker : Dr. Aniket Patra, Aarhus University, Denmark.
    Date : October 14, 2022 (Friday)
    Time : 15:00 hours (IST)
    Venue : Physics Seminar Room (C-406), 3rd Floor, Centenary Building, IACS
  • Cosmic rays and magnetic fields in clusters of galaxies
  • Title: Cosmic rays and magnetic fields in clusters of galaxies
    Speaker:Professor Ruta Kale, National Centre for Radio Astrophysics - Tata Institute of Fundamental Research, Savitribai Phule Pune University Campus, Pune, Maharashtra, INDIA
    Date:September 15, 2022 (Thursday) 
    Time:15:00 hours (IST)
    Venue: Physics Seminar Room (C-406), 3rd Floor, Centenary Building, IACS
  • Exploratory synthesis and novel magnetism of magnetically frustrated systems and magnetic topologica
  • Title: Exploratory synthesis and novel magnetism of magnetically frustrated systems
    and magnetic topological materials
    Speaker: Dr. Santanu Pakhira, Ames National Laboratory - US Department of Energy, Ames, Iowa, USA
    Date: August 31, 2022 (Wednesday)
    Time: 17:00 hours (IST)  
    Venue: Online Mode using Zoom Platform
    Zoom link of the seminar: https://zoom.us/j/97021270635 
    Meeting ID:  970 2127 0635
    Passcode:  259853 
  • Observing nulls in primordial correlations via the 21 cm signal
  • Title: Observing nulls in primordial correlations via the 21 cm signal
    Speaker: Dr.  H. V. Ragavendra, IISER, Kolkata
    Date: September 01, 2022 (Thursday) 
    Time: 15:00 hours (IST)
    Venue: Physics Seminar Room (C-406), 3rd Floor, Centenary Building, IACS
    Join Zoom Meeting : https://zoom.us/j/93343455180
    Meeting ID: 933 4345 5180
    Passcode: 157066
  • Tunable quantum states in square-net materials
  • Title:Tunable quantum states in square-net materials
    Speaker:Dr. Ratnadwip Singha, Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
    Date:August 30, 2022 (Tuesday)
    Time:17:00 hours (IST)  
    Venue:Online Mode using Zoom Platform
    Zoom link of the seminar:https://zoom.us/j/97021270635
    Meeting ID: 970 2127 0635
    Passcode: 259853
  • Not just fat: proteotoxicity in non-alcoholic fatty liver disease (NAFLD)
  • Title: Not just fat: proteotoxicity in non-alcoholic fatty liver disease (NAFLD)
    Speaker: Dr. Partha Chakrabarti, Principal Scientist, Cell Biology & Physiology, CSIR-Indian Institute of Chemical Biology, Kolkata.
    Webinar: meet.google.com/jvz-zuyo-hnz  (google meet link)
    Date & Time: 12th November, 2020, 03:30 pm
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