Category Archives: Research

Kamal Dhungana Research

Kamal Dhungana Research
Schematic diagram of a fluorinated boron nitride nanotube based spin filter device.

Fluorinated boron nitride nanotube as an ideal spin filter

Advisor: Dr. Ranjit Pati

Understanding the electronic structure and the transport property of nano scale materials is of fundamental importance, since these materials are the ultimate candidates for the future of nano technology. Several nano materials, such as quantum dots, semiconducting nano-wires, and organic molecules, have been explored both theoretically and experimentally as the components of electronic circuitry over the last two decades. Among several interesting nano materials, metal free magnetic nano materials are found to be very enticing due to the presence of magnetism in the absence of magnetic ions. Traditionally, the magnetism comes from partially occupied d and f states in the materials; however, this understanding is not always true since s and p states are found to contribute to the magnetism in the metal free magnetic materials. The main advantage of these materials is their high Curie temperature; as a result, they can be utilized in room temperature spin-electronics (spintronics). Recently, using a first-principles approach, we have demonstrated that the fluorinated boron nitride nanotube (BNNT), which is a metal-free magnetic entity, can be used as an excellent spin filter. All majority spin carriers are almost completely blocked while passing through the fluorinated BNNT channel, allowing only the minority spin carriers to pass. We have shown that the long range ferromagnetic spin ordering in fluorinated BNNTs occurs at a temperature much above room temperature.

For more information, please visit my webpage: http://www.phy.mtu.edu/~kbdhunga

By Kamal B. Dhungana

Reference:

Kamal B. Dhungana, Ranjit Pati, Fluorinated Boron Nitride Nanotube Quantum Dots: A Spin Filter. J. Am. Chem. Soc., 2014, 136, 11494–11498. 

Interview on “Superior” Supercomputer

Computational StructureAny university involved in compute-intensive research would love to have a supercomputer at its disposal. Michigan Technological University is one of the fortunate ones to have a super-fast machine accessible by the entire research community on campus. The computer is known as “Superior” and we sat down with Gowtham S., Director of Research Computing at the University, to hear more about it.

insideHPC: The system’s installation just had its one year anniversary. What are some of the current projects that are harnessing all of this power?

Gowtham S.: Modeling the circulation and particle transport in the Great Lakes system, multi scale modeling of advanced materials and structures, nanostructured materials for electronics, biosensing and human health implications, and unsupervised learning in Big Data and social networks are some of the on going projects that use the power of Superior. Here is the complete listing of all 30 projects.

These projects have produced nearly two dozen publications as well, and several proposals are underway for even more projects. That makes us quite happy.

Read the full interview at insideHPC.

This interview refers to three projects within the Department of Physics.

  • Physics, Johana Chirinos, Investigations in ultra-high-energy cosmic ray physics
  • Physics, Ranjit Pati, Computational study of charge and spin transport in nano-scale junctions from first-principles
  • Physics, Ravindra Pandey, Computational studies of nanostructured materials for electronics, biosensing and human health implications

Proposals in Progress for July 14, 2014

PI Claudio Mazzoleni (Physics) and Co-PIs Lynn Mazzoleni (Chem), Raymond Shaw (Physics) and Will Cantrell (Physics), “Azores Integrated Measurements (AIM): Free Tropospheric and Marine Boundary Layer Aerosol Properties at the Eastern North Atlantic Permanent ARM Facility and the Pico Mountain Observatory, Azores,” US Department of Energy.

PI Dongyan Zhang (Physics) and Co-PIs Nazmiye Yapici (Physics) and Jim Baker (IEE), “High Brightness Fluorescence Reagents for Biomedical Applications,” NSF.

PI John Diebel (IIE) and Co-PI Yoke Khin Yap (Physics), “High Brightness Fluorescence Biosensors and Chemosensors,” University of Michigan/MIIE.

Read more at Tech Today.

Associate Professor Huentemeyer Provides Updates on HAWC

Petra Huentemeyer
Petra Huentemeyer

Astrophysics Highlights from the APS April Meeting

HAWC Observatory Online
At a press conference, Petra Huentemeyer of Michigan Technological University gave a status update and early results from the High-Altitude Water Chernkov (HAWC) observatory. HAWC will produce a wide-field picture of the universe in TeV gamma rays and cosmic rays. With just one third of its total planned array online, HAWC has already exceeded the sensitivity of its predecessor MILAGRO.

Read more at the American Physical Society News, by Calla Cofield.

Transistors Without Semiconductors Highlighted

MRS Spring 2014 highlightResearch work lead by Professor Yoke Khin Yap (Physics) has gained attention in the 2014 Materials Research Society (MRS) Spring Meeting at San Francisco, held on April 21-25, 2014. The presentation, “Transistors without Semiconductors: Tunneling Behavior of Boron Nitride Nanotubes Functionalized with Gold Quantum Dots”, presented in Symposium BB: Materials for End-of-Roadmap Devices in Logic, Power and Memory, was highlighted in the official website of MRS.

This work was conducted in collaboration with Professor John Jaszczak (Physics), Dr. Dongyan Zhang (Physics), physics graduate students Madhusudan Savaikar, Douglas Banyai, Boyi Hao (All in Physics), and collaborators from Oak Ridge National Laboratory.

Submitted by Yoke Khin Yap.

Yap Organizes Symposium MM for Spring 2014 MRS Meeting

MRS Spring 2014Professor Yoke Khin Yap (Physics) organized Symposium MM in the 2014 Materials Research Society (MRS) Spring Meeting at San Francisco on April 21-25. The symposium, “Nanotubes and Related Nanostructures” was co-organized with Don Futaba from National Institute of Advanced Industrial Science and Technology (AIST, Japan), Annick Loiseau from Laboratoire d’Etude des Microstructures (LEM, France), and Ming Zheng from National Institute of Standards and Technology (NIST). The Director of the Michigan Tech Multi-Scale Technologies Institute (MuSTI), Professor Craig Frederich (MEEM) hosted the invited speakers and organizers in a dinner event. Professor Frederich co-chaired session six in the symposium.

From Tech Today.

REF Awards for Cantrell and Yap

Research Excellence Fund Awards Announced

The Vice President for Research Office is pleased to announce the 2015 REF awards and would like to thank the volunteer review committees, as well as the deans and department chairs, for their time spent on this important internal research award process.

Will Cantrell, EPSSI/Physics, received an Infrastructure Enhancement Grant.

Yoke Khin Yap, Physics, received a Technology Commercialization Grant.

Read more at Tech Today.