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.
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Probing Spin Dynamics of 2D Excitons with Twisted Light Pattanayak A. K., Das P. , Chakrabarty D. , Dhara A. , Paul S. , Maji S. , Brundavanam M. M., Dhara S. By ACS Photonics 00 0000-0000 (2022)
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Tunable thermal conductivity in defect engineered nanowires 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. By Phys. Rev. B 84 - (2011)
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A steady state approach for studying valley relaxation using an optical vortex beam Pattanayak A. K., Das P. , Dhara A. , Chakrabarty D. , Paul S. , Gurnani K. , Brundavanam M. M., Dhara S. By Nano Letters 000-000 (2022)
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Interfacial anisotropic exciton-polariton manifolds in ReS2 Chakrabarty D., Dhara A. , Ghosh K. , Pattanayak A. K., Mukherjee S. , Chaudhuri A. R., Dhara S. By Optica 8 1488-1494 (2021)
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Additional excitonic features and momentum-dark states in ReS2 Dhara A., Chakrabarty D. , Das P. , Pattanayak A. K., Paul S. , Mukherjee S. , Dhara S. By Physical Review B 102 161404- (2020)
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Anomalous dispersion of microcavity trion-polaritons Dhara S., Chakraborty C. , Goodfellow K. M., Qiu L. , O Loughlin T. A., Wicks G. W., Bhattacharjee S. , Vamivakas A. N. By Nature Physics 14 130-133 (2018)
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Room-temperature valley coherence in a polaritonic system Qiu L., Chakraborty C. , Dhara S. , Vamivakas A. N. By Nature Communications 10 1513- (2019)
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Voltage tunable circular photogalvanic effect in Si nanowire S. Dhara, E. J. Mele and R. Agarwal By Science 349 726-729 (2015)
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Facile fabrication of lateral nanowire wrap-gate devices with improved performance S. Dhara, S. Sengupta, H. S. Solanki, A. Maurya, A. Pavan R., M. R. Gokhale, A. Bhattacharya and M. M. Deshmukh. By Appl. Phys. Lett. 99 - (2011)
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Magnetotransport properties of individual InAs nanowires, S. Dhara, H. S. Solanki, V. Singh, A. Narayanan, P. Chaudhari, M. Gokhale, A. Bhattacharya, and M. M. Deshmukh. By Phys. Rev. B 79 - (2009)
Principal Investigator
- Generation of Exciton-polariton Laser using Two Dimensional Semiconductor Embedded Optical Microcavity
- Solid State Quantum Optical Devices using 2D Materials
Co-Principal Investigator
- Ge Based Short-Wavelength Infrared (SWIR) Photodetectors for Imaging Application Ministry of Electronics and Information Technology
- High-k Dielectric Substrate Engineering of Two Dimensional Semiconducting TMDCs for Advanced (opto) Electronic Applications Science and Engineering Research Board (SERB)
Ph. D. Students
Avijit Dhara
Area of Research: Physics
Bidhan Mandal
Area of Research: Semiconductor Optics and Condensed Matter Physics
Devarshi Chakrabarty
Area of Research: Nanoscale Optoelectronics
Pritam Das
Area of Research: Semiconductor Optics
Shreya Paul
Area of Research: Nanoscale Optoelectronics
