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Deshmukh, Mandar M.
- Nanoelectromechanics Using Graphene
Abstract Views :258 |
PDF Views:93
Authors
Affiliations
1 Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
1 Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
Source
Current Science, Vol 107, No 3 (2014), Pagination: 437-446Abstract
The large in-plane modulus of rigidity and low mass density of one-atom-thick graphene makes it an exciting material for studying mechanics at nanoscale. Further, the remarkable electronic properties of graphene give an additional edge to explore the small coupling between electronic and mechanical degrees of freedom. Ballistic transport can be reached in very clean suspended graphene samples, allowing to probe coupling between nanoscale electromechanics and quantum Hall effect. Such devices can also be used to measure intrinsic properties of graphene like coefficient of thermal expansion. In this article, we present summary of results from our group integrating these aspects of graphene. Towards the end, we briefly speculate roadmap for future experiments harnessing unique properties of graphene. Nanomechanical devices can then be used for applications as well as to explore aspects of mesoscopic physics with unprecedented detail.Keywords
Graphene, Nanoelectromechanics, Quantum Hall Effect, Thermal Expansion.Full Text
- Influence of Fabrication Processes on Transport Properties of Superconducting Niobium Nitride Nanowires
Abstract Views :325 |
PDF Views:92
Authors
Manju Singh
1,
Rishu Chaujar
2,
Sudhir Husale
1,
S. Grover
3,
Amit P. Shah
3,
Mandar M. Deshmukh
3,
Anurag Gupta
1,
V. N. Singh
1,
V. N. Ojha
1,
D. K. Aswal
1,
R. K. Rakshit
1
Affiliations
1 Academy of Scientific and Innovative Research, CSIR-NPL Campus, Dr K.S. Krishnan Marg, New Delhi 110 012, IN
2 Microelectronics Research Laboratory, Department of Engineering Physics, Delhi Technological University, Bawana Road, Delhi 110 042, IN
3 Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
1 Academy of Scientific and Innovative Research, CSIR-NPL Campus, Dr K.S. Krishnan Marg, New Delhi 110 012, IN
2 Microelectronics Research Laboratory, Department of Engineering Physics, Delhi Technological University, Bawana Road, Delhi 110 042, IN
3 Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
Source
Current Science, Vol 114, No 07 (2018), Pagination: 1443-1450Abstract
Fabrication of niobium nitride (NbN) superconducting nanowires based on focused ion beam (FIB) milling and electron beam lithography (EBL) is presented. The NbN films were deposited using reactive magnetron sputtering. Argon-to-nitrogen ratio turned out to be a crucial factor in synthesizing high quality superconducting NbN. Critical temperatures (Tc) of around 15.5 K were measured for films with a thickness of around 10 nm. Zero-field-cooled magnetization was measured to optimize the superconducting properties of ultra thin NbN films. The transport behaviour was studied using conventional resistance vs temperature and current-voltage characteristics down to 2 K. Effect of gallium contamination on superconducting properties has been discussed. Whereas the various processing steps of standard EBL route do not have any significant impact on the superconducting transition temperature as well as on the transition width of nanowires, there is significant degradation of superconducting properties of nanowires prepared using FIB. This has been attributed to gallium ion implantation across the superconducting channel. Although the effect of gallium implantation may have technological limitations in designing fascinating single photon detector architectures, it provides some interesting low-dimensional superconducting properties.Keywords
DC Magnetron Sputtering, EBL, FIB, Niobium Nitride, Superconducting Nanostructure, Thin Films.Full Text
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