Materials Science Section

Major Research Areas

Fundamental physics studies are being pursued with the help of following characterization techniques:

Ultra-fast laser spectroscopy

In this Lab, our aim is to understand various quantum processes and carrier dynamics in nanomaterials with sub-picosecond time resolution. Understanding of such factors is critically important in the development of advanced semiconductor devices. It provide us an opportunity to design the devices which directly use quantum principles like quantum entanglement, quantum superposition and quantum tunneling. Quantum states in semiconductors are explored by probing the charge (electrons and holes) and spin degrees of freedom. Quantum states can be used to encode and process classical or quantum information. Using ultrafast lasers, it is possible to control and manipulate these classical/quantum states. We investigate the optical properties, ultrafast carrier dynamics and quantum decoherence in various nanomaterials to identify and control quantum states having long quantum coherence time. Ultrafast coherent manipulation of quantum states in low-dimensional systems is being pursued by us in a few exciting materials. For this purpose, we have the following advanced facilities:

  • Femtosecond Ti:Sapphire Oscillators (Tsunami, Spectra-physics and Mai-Tai, Spectra-physics)
  • Femtosecond Ti:Sapphire Oscillator-Amplifier-OPA system (Mai-Tai, Spectra-physics)
  • Scanning Probe Microscope (Multimode 8, Bruker)

MSS

Currently we are working on the following materials:

  • Semiconductor quantum dots, quantum wires and quantum wells
  • 2D semiconductors
  • Metal nanoparticles of different shapes and sizes
  • Metal-Semiconductor hybrid nanostructures

MSS

Selected publications

  1. Static and Ultrafast Optical Response of Two Metal Nanoparticles Glued with a Semiconductor Quantum Dot, Sabina Gurung, Asha Singh, Durga Prasad Khatua, Himanshu Srivastava, and J. Jayabalan, Photonics Nanostructures: Fundam. Appl. 43, 100869 (2021).
  2. Filtering Noise in Time and Frequency Domain for Ultrafast Pump-Probe Performed Using Low Repetition Rate Lasers, Durga Prasad Khatua, Sabina Gurung, Asha Singh, Salahuddin Khan, Tarun Kumar Sharma, and J. Jayabalan, Rev. Sci. Instrum. 91, 103901 (2020).
  3. Counting the Electrons Hopping in Ultrafast Time Scales in an Ag-CdTe Hybrid Nanostructure, Asha Singh, Sabina Gurung, Rama Chari, and J. Jayabalan, J. Phys. Chem. C 123, 28584 (2019).
  4. The optical response of self-organized Ag-CdTe metal-semiconductor hybrid nanostructures: Change in interaction vs number density variation, Sabina Gurung, Asha Singh, Rama Chari, and J. Jayabalan, J. Appl. Phys. 124, 204305 (2018).
  5. Femtosecond laser induced photoluminescence enhancement of TGA-capped CdTe quantum dots, Asha Singh, J. Jayabalan, Salahuddin Khan, Rama Chari, J. Lumin. 194, 45 (2018).
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