Home > Academics > Academic Units > Departments > Physics > Sajal Dhara
Assistant Professor Grade-I
Physics
Physical properties of a material and sometimes governing laws of physics can be drastically different when it’s dimension is reduced. On the other hand, symmetry of a lattice, which specifies a class of materials plays an important role that can exhibit an unusual electronic and optical properties which can be useful for development of future technologies. One of the interests of the Nanoscale Optoelectronics group is to explore the broad area of research in reduced dimensions of semiconducting materials such as, graphene like layered materials, nanowires, and quantum dots. We combine electron transport and optical spectroscopy to probe the electronic energy bands at low energy excitation of such materials. Examples of such two dimensional materials are the transition metal dichalcogenides (TMDCs), unlike graphene, these TMDCs in monolayer structure has the inversion symmetry broken that makes it to be an optically active direct bandgap material which can support strongly bound two dimensional excitons. We will not only look at the electronic states but also will probe the interesting physics of excitons when it interacts strongly with light.
Additional excitonic features and momentum-dark states in ReS2 by Dhara A., Chakrabarty D. , Das P. , Pattanayak A. K., Paul S. , Mukherjee S. , Dhara S. Physical Review B 102 161404- (2020)
Room-temperature valley coherence in a polaritonic system by Qiu L., Chakraborty C. , Dhara S. , Vamivakas A. N. Nature Communications 10 1513- (2019)
Anomalous dispersion of microcavity trion-polaritons by Dhara S., Chakraborty C. , Goodfellow K. M., Qiu L. , O Loughlin T. A., Wicks G. W., Bhattacharjee S. , Vamivakas A. N. Nature Physics 14 130-133 (2018)
3D localized trions in monolayer WSe2 in a charge tunable van der Waals heterostructure by Chakraborty C., Qiu L. , Konthasinghe K. , Mukherjee A. , Dhara S. , Vamivakas N. Nano Letters - (2018)
Quantum-Confined Stark Effect of Individual Defects in a van der Waals Heterostructure by Chakraborty C., Goodfellow K. , Dhara S. , Yoshimura A. , Meunier V. , Vamivakas N. Nano Letters 17 2253-2258 (2017)
Voltage tunable circular photogalvanic effect in Si nanowire by S. Dhara, E. J. Mele and R. Agarwal Science 349 726-729 (2015)
Magnetotransport properties of individual InAs nanowires, by S. Dhara, H. S. Solanki, V. Singh, A. Narayanan, P. Chaudhari, M. Gokhale, A. Bhattacharya, and M. M. Deshmukh. Phys. Rev. B 79 - (2009)
Tunable thermal conductivity in defect engineered nanowires by S. Dhara, H. S. Solanki, A. Pawan R., V. Singh, S. Sengupta, B. A. Chalke, A. Dhar, M. Gokhale, A. Bhattacharya and M. M. Deshmukh. Phys. Rev. B 84 - (2011)
Facile fabrication of lateral nanowire wrap-gate devices with improved performance by S. Dhara, S. Sengupta, H. S. Solanki, A. Maurya, A. Pavan R., M. R. Gokhale, A. Bhattacharya and M. M. Deshmukh. Appl. Phys. Lett. 99 - (2011)
Probing thermal expansion of graphene and modal dispersion at low-temperature using graphene NEMS resonators, by V. Singh, S. Sengupta, H. S. Solanki, R. Dhall, A. Allain, S. Dhara, P. Pant and M. M. Deshmukh Nanotechnology 21 - (2010)
Solid State Quantum Optical Devices using 2D Materials MHRD-STARS
Generation of Exciton-polariton Laser using Two Dimensional Semiconductor Embedded Optical Microcavity Science and Engineering Research Board (SERB)
Mesoscopic Optics and Electron Transport Science and Engineering Research Board (SERB)
Ge Nanowires Based Short-Wavelength Infrared (SWIR) Photodetectors for Imaging Applications Department of Science and Technology(DST)
Ge Based Short-Wavelength Infrared (SWIR) Photodetectors for Imaging Application Ministry of Electronics and Information Technology
Aswini Kumar Pattanayak
Area of Research: Optics
Avijit Dhara
Area of Research: Physics
Devarshi Chakrabarty
Area of Research: Nanoscale Optoelectronics
Shreya Paul
Area of Research: Nanoscale Optoelectronics
Shreyashi Mukherjee
Area of Research: Semiconductor Optics
Pritam Das
Area of Research: Semiconductor Optics
