Home > Academics > Academic Units > Departments > Physics > Sajal Dhara
Assistant Professor
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.
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)
Carrier transport in high mobility InAs nanowire junctionless transistors. by A. Konar, J. Mathew, K. Nayak, M. Bajaj, R. K. Pandey, S. Dhara, K. V. R. M. Murali, M. Deshmukh. Nano Lett. 15 1684-1690 (2015)
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)
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)
Direct observation of metal-insulator transition in single-crystalline germanium telluride nanowire memory devices prior to amorphization by P. Nukala, R. Agarwal, X. Qian, M. H. Jang, S. Dhara, K. Kumar, A. T. C. Johnson, Ju Li, and R. Agarwal Nano Lett. 14 2201-2209 (2014)
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)
Nanoscale Optics to Probe Microcavity Polaritons in Two Dimensional Systems MHRD
Scanning Photocurrent Spectroscopy in 2D Layered Materials ISIRD, SRIC
Mesoscopic Optics and Electron Transport Science and Engineering Research Board (SERB)
Aswini Kumar Pattanayak
Area of Research: Optics
Rupesh Chakraborty
Area of Research: Physics and Materials Science
Avijit Dhara
Area of Research: Physics
Devarshi Chakrabarty
Area of Research: Nanoscale Optoelectronics
Shreya Paul
Area of Research: Nanoscale Optoelectronics
