QUANTUM MAGNETISM RESEARCH LABORATORY
Research Supported by the Office of Basic Energy Sciences, US Department of Energy
Collaborators: Neutron Science Directorate, ORNL
Dr. Deepak K. Singh, Principal Investigator
Associate Professor of Physics
Core Faculty in MU Materials Science and Engineering Institute
University of Missouri, Columbia
Ph.: (573) 882-7024
Email: singhdk@missouri.edu
Ph.D. (Physics) - University of Massachusetts, Amherst
Postdoc (Physics) - MIT, Cambridge MA
RESEARCH THEMES
Macroscopic 'quasi particle' relaxation in nanoscopic magnetic lattice
(Contrary to the conventional understanding that domain wall dynamics requires magnetic field or current application, our research has revealed a perpetual dynamic state in honeycomb lattice in the absence of any external stimuli.)
See the paper "Persistent dynamic magnetic state in artificial honeycomb spin ice", Jiasen Guo, Pousali Ghosh, Daniel Hill, Yiyao Chen, Laura Stingaciu, Piotr Zolnierczuk, Carsten A Ullrich, Deepak K Singh, Nature Communications 14, Article number: 5212 (2023)
Spintronics Research Due to Magnetic Charge Mediation
(Indirect interaction between dynamic magnetic charge defect and electric charge carriers propels electrical conduction)
(Image courtsey to Jill Herman, ORNL)
Quantum Magnetic State in Bulk Ruthenate Perovskite, Geometrically Frustrated Magnet, 2D Kagome Lattice, Silicide, Arsenide
(Study of bulk materials, especially in crystalline form, act as guide in the pursuit of novel phenomena in 2D systems)
(Quantum continuum fluctuation inside the spin glass phase of a ruthenate perovskite.)
Chen et al., Materials Today Physics (2019)
CURRENT RESEARCH PROJECTS
Nanofabrication of large areal coverage artificial honeycomb lattice to study the quantum mechanical characteristic of magnetic charges
Study of quantum magnetism and spintronic properties in 'home grown' single crystal magnet
Exploration of new magnetic and superconducting phenomena in 2D thin film, grown using CVD technique, with reduced degrees of freedom.
Experimental and Analytical Techniques
Neutron scattering methods; Onsite characterizations of electrical and magnetic properties; Electron microscopy; DWBA simulations; Model calculations of spin-spin correlations
Selected Research Highlights from the Lab
New spintronics research venue in antiferromagnetic NiSi
P. Ghosh, J. Guo, F. Ye, T. Heitmann, G. Yumnam, S. Kelley, A. Ernst, V. Dugaev and D. K. Singh, "NiSi: New venue for antiferromagnetic spintronics", Advanced Materials 2302120 (2023)
See Office of Science - DOE highlight at
Quantum disordered state of magnetic charges
(A new state of "magnetic charge liquid state" arises at low temp.)
G. Yumnam, Y. Chen, J. Guo, J. Keum, V. Lauter and D. K. Singh, “Quantum disordered state of magnetic charges in nanoengineered honeycomb lattice”, Advanced Science 8, 2004103 (2020).
Wigner crystal state of magnetic charges
Y. Chen, B. Summers, A. Dahal, V. Lauter, G. Vignale and D. K. Singh, “Field and current control of the electrical conductivity of an artificial two-dimensional honeycomb lattice”, Advanced Materials 31, 1808298 (2019)
Quantum fluctuation due to Anderson localized artificial spin-1/2 in ruthenate perovskite
J. Gunasekera, Y. Chen, A. Dahal, J. Rodriguez, L. Harriger, S. Thomas, T. Heitmann, V. Dugaev, A. Ernst and D. K. Singh,“Quantum magnetic properties in perovskite with Anderson localized artificial spin-1/2”, Advanced Science 5, 1700978 (2018)
Novel Magnetic Phases: Spin Solid versus Magnetic Charge Ordered State in Artificial Honeycomb Lattice of Connected Elements
Artur Glavic, Brock Summers, Ashutosh Dahal, Joseph Kline, Walter Van Herck, Alexander Sukhov, Arthur Ernst and Deepak K. Singh
Advanced science 5 (4), 1700856 (2018)
Discovery of magnetic diode effect in permalloy honeycomb lattice
(The finding paves way for the realization of new spintornic research platform due to magnetic charge mediation.)
B. Summers, A. Dahal and D. K. Singh, “Magnetic diode behavior at room temperature in two-dimensional honeycomb”, Advanced Electronic Materials 4, 1700500 (2018)
G. Yumnam, J. Guo, Y. Chen, A. Dahal, P. Ghosh, Q. Cunningham, V. Lauter and D. K. Singh, “Magnetic charge and geometry confluence for ultra-low forward voltage diode in artificial honeycomb lattice”, Materials Today Physics 22, 100574 (2021).
G. Yumnam, M. Nandi, P. Ghosh, A. Abdullah, M. Almasri, E. Henriksen and D. K. Singh*, Field and temperature tuning of magnetic diode in permalloy honeycomb lattice, Materials Today Advances, 18, 100386 (2023)
Patents:
1. US Patent issued (patent no. 10,403,810) on the discovery of “Magnetic diode behavior in permalloy artificial honeycomb lattice of ultra-small connecting elements”, (2019)
2. US Patent on the discovery of “Transistor-free logic gate and chip development in artificial 2D honeycomb magnetic materia”, Provisional patent number 24UMC038 (2024).
Media coverage on the discovery of Magnetic diode: PBS news, KOMU tv, KCRG tv, The Hindu (India), Daily Mail (UK), The Register (UK) etc.
Podcast: People behind the science (Episode 465)
Full publication list can be found at: https://scholar.google.com/citations?user=_Ybn_5kAAAAJ&hl=en