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Your search keyword '"Patel, Dinesh K."' showing total 529 results
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529 results on '"Patel, Dinesh K."'

3. Algorithms for determining resistances in quantum Hall annuli with p-n junctions

Author

Liu, Chieh-I, Scaletta, Dominick S., Patel, Dinesh K., Kruskopf, Mattias, Levy, Antonio, Hill, Heather M., and Rigosi, Albert F.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Just a few of the promising applications of graphene Corbino pnJ devices include two-dimensional Dirac fermion microscopes, custom programmable quantized resistors, and mesoscopic valley filters. In some cases, device scalability is crucial, as seen in fields like resistance metrology, where graphene devices are required to accommodate currents of the order 100 {\mu}A to be compatible with existing infrastructure. However, fabrication of these devices still poses many difficulties. In this work, unusual quantized resistances are observed in epitaxial graphene Corbino p-n junction devices held at the i=2 plateau and agree with numerical simulations performed with the LTspice circuit simulator. The formulae describing experimental and simulated data are empirically derived for generalized placement of up to three current terminals and accurately reflects observed partial edge channel cancellation. These results support the use of ultraviolet lithography as a way to scale up graphene-based devices with suitably narrow junctions that could be applied in a variety of subfields

Published
2022

4. Fabrication of quantum Hall p-n junction checkerboards

Author

Patel, Dinesh K., Marzano, Martina, Liu, Chieh-I, Kruskopf, Mattias, Elmquist, Randolph E., Liang, Chi-Te, and Rigosi, Albert F.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

Measurements of fractional multiples of the {\nu}=2 plateau quantized Hall resistance (R_H {\approx} 12906 {\Omega}) were enabled by the utilization of multiple current terminals on millimetre-scale graphene p-n junction devices fabricated with interfaces along both lateral directions. These quantum Hall resistance checkerboard devices have been demonstrated to match quantized resistance outputs numerically calculated with the LTspice circuit simulator. From the devices' functionality, more complex embodiments of the quantum Hall resistance checkerboard were simulated to highlight the parameter space within which these devices could operate. Moreover, these measurements suggest that the scalability of p-n junction fabrication on millimetre or centimetre scales is feasible with regards to graphene device manufacturing by using the far more efficient process of standard ultraviolet lithography.

Published
2022

5. Quantum Hall $p-n$ Junction Dartboards Using Graphene Annuli

Author

Liu, Chieh-I, Patel, Dinesh K., Marzano, Martina, Kruskopf, Mattias, Hill, Heather M., and Rigosi, Albert F.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

The use of multiple current terminals on millimeter-scale graphene $p-n$ junction devices fabricated with Corbino geometries, or quantum Hall resistance dartboards, have enabled the measurement of several fractional multiples of the quantized Hall resistance at the $\nu=2$ plateau ($R_H\approx 12906 {\Omega}$). Experimentally obtained values agreed with corresponding numerical simulations performed with the LTspice circuit simulator. More complicated designs of the quantum Hall resistance dartboard were simulated to establish the potential parameter space within which these Corbino-type devices could output resistance. Most importantly, these measurements support simpler processes of ultraviolet lithography as a more efficient means of scaling up graphene-based device sizes while maintaining sufficiently narrow junctions.

Published
2022

6. Algorithm for constructing customized quantized resistances in graphene $p-n$ junctions

Author

Rigosi, Albert F., Marzano, Martina, Levy, Antonio, Hill, Heather M., Patel, Dinesh K., Kruskopf, Mattias, Jin, Hanbyul, Elmquist, Randolph E., and Newell, David B.

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

An algorithm is introduced for predicting quantized resistances in graphene p-n junction devices that utilize more than a single entry and exit point for electron flow. Depending on the configuration of an arbitrary number of terminals, electrical measurements yield fractional multiples of the typical quantized Hall resistance at the $\nu=2$ plateau $R_H \approx 12906 {\Omega}$ and take the form: $\frac{a}{b}R_H$. This theoretical formulation is independent of material, and applications to other material systems that exhibit quantum Hall behaviors are to be expected. Furthermore, this formulation is supported with experimental data from graphene-based devices with multiple source and drain terminals.

Published
2022

42. Contributors

Author

Abd-Elsalam, Kamel A., primary, Ahmad, Hirra, additional, Ahmed, Farah K., additional, Akhtar, Muhammad Nadeem, additional, Akram, Saba, additional, Ali, Imran, additional, Amjed, Muhammad Ahsan, additional, Anggorowati, Adriana Anteng, additional, Ashfaq, Mohammad, additional, Asif, Muhammad Ibrar, additional, Baruah, Sunandan, additional, Bhatti, Haq Nawaz, additional, Bhatti, Ijaz Ahmad, additional, Budihal, Suman V., additional, Chauhan, Divya, additional, Drioli, Enrico, additional, Dutta, Sayan Deb, additional, El Zerey-Belaskri, Asma, additional, Emmanuel Joshua Jebasingh, S., additional, Fathy, Nady A., additional, Gacem, Mohamed Amine, additional, Ganguly, Keya, additional, Hanif, Asma, additional, Hanif, Muhammad Asif, additional, Huang, Haiou, additional, Hussain, Tajamal, additional, Islam, Tariqul, additional, Ismadji, Suryadi, additional, Jampílek, Josef, additional, Jesi Reeta, T., additional, Kalita, Dipjyoti, additional, Khalid, Tayyaba, additional, Khan, Fareeda, additional, Khan, Farkhanda Ghafoor, additional, Khan, Imran, additional, Khan, Zahid M., additional, Kráľová, Katarína, additional, Kurniawan, Alfin, additional, Lim, Ki-Taek, additional, Luan, Hongyan, additional, Mangalanagasundari, S., additional, Mansha, Asim, additional, Mostafa, Manal, additional, Murugan, K., additional, Mushtaq, Farwa, additional, Mustafa, Ghulam, additional, Muthu, K., additional, Nadeem, Farwa, additional, Nadeem, Nimra, additional, Naqvi, Syed Ali Raza, additional, Naz, Iffat, additional, Noreen, Saima, additional, Ould El Hadj Khelil, Aminata, additional, Parwez, Khalid, additional, Patel, Dinesh K., additional, Paulkumar, K., additional, Peng, Changsheng, additional, Perveen, Irum, additional, Pervez, Rashid, additional, Rashid, Anum, additional, Rehan, Zulfiqar Ahmad, additional, Romanovski, Valentin, additional, Santoso, Shella Permatasari, additional, Sarkar, Arnab Kumar, additional, Sehar, Shama, additional, Shahid, Imran, additional, Shahzeb Khan, Muhammad, additional, Sherazi, Tauqir A., additional, Soetaredjo, Felycia Edi, additional, Syed, U.T., additional, Tabasum, Asma, additional, Tahir, Noor, additional, Talreja, Neetu, additional, Tehrim, Aafia, additional, Telli, Alia, additional, Ullah, Asmat, additional, Ullah, Ikram, additional, Ulucan-Altuntas, Kubra, additional, Wink, Joachim, additional, Yuliansa, Maria, additional, and Zahid, Muhammad, additional

Published
2021
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44. Electrically Controlled Liquid Crystal Elastomer Surfaces for Dynamic Wrinkling.

Author

Li, Zefang, Olson, Gina, Patel, Dinesh K., Yao, Lining, and Majidi, Carmel

Subjects
LIQUID crystals, CRYSTAL surfaces, COLLECTIVE memory, CONDUCTIVE ink, SURFACE topography, ELECTRIC stimulation
Abstract

Liquid crystal elastomers (LCEs) are becoming increasingly popular as a shape memory material for soft robot actuators that operate in a contractile or flexural mode. There have been previously studies on the use of LCEs for reversible changes in surface topography. However, surface protrusions have typically been limited to the order of 1 μm or depend on light, heat, or electrical stimulation that are difficult to locally control or require relatively high voltage. This article presents a novel operation mode of LCE actuators based on the wrinkling behavior of an LCE‐elastomer bilayer architecture. Embedding a liquid‐metal‐based conductive ink within the LCE enables electrical control of surface wrinkling through Joule heating. The actuator cells can generate wrinkles with amplitudes ranging from 17 to 45 μm within 30 s under an input power of 2 W and a voltage on the order of 1 V. As the bilayer is composed entirely of soft materials, it is highly deformable, flexible, and can be integrated into a multi‐cell array capable of bending on curved surfaces. [ABSTRACT FROM AUTHOR]

Published
2024
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