David M Fobes
Information Systems & Modeling
Los Alamos National Laboratory
Experience
Los Alamos National Laboratory
R&D Manager
Deputy Group Leader of the Information Systems & Modeling Group (A-1)
Los Alamos National Laboratory
Scientist
Scientist in the Information Systems and Modeling Group (A-1)
Los Alamos National Laboratory
Postdoc Research Associate
Investigation of the magnetism dynamics of heavy fermion compounds and skyrmion materials using neutron spectroscopy, discovering an intimate connection between the modulated magnetic states of CeRhIn5 and its high nematic susceptibility, and making the first measurements of the spin excitation spectra of skyrmion compound MnSi via neutron Time of Flight spectroscopy. Also designed and successfully tested a versatile new uniaxial strain device for use in small angle neutron scattering
Brookhaven National Laboratory
Research Associate
Study of the lattice dynamics in the iron chalcogenide superconducting family Fe(1+y)Te(1-x)Se(x) using neutron scattering, finding evidence for an orbital ordering transition in parent compound FeTe, appearing as a Bond-Order-Wave, and for an intimate coupling between magnetic fluctuations and the lattice degree of freedom resulting in the appearance of a "forbidden" phonon. Also participated in the comissioning of a hybrid spectrometer (HYSPEC) at Oak Ridge National Lab's Spallation Neutron Source, and began developement of NeutronPy
Tulane University
Postdoctoral Research Fellow
Investigation of the superconductivity as a function of excess-Fe content in iron chalcogenide superconductor family Fe(1+y)Te(1-x)Se(x) via materials synthesis, bulk characterization techniques, and neutron scattering
Education
Tulane University
Doctor of Philosophy (Ph.D.) in Physics
Dissertation: 'Orbital dependence of magnetism in layered ruthenate systems'
Advisor: Zhiqiang Mao
Tulane University
Bachelor of Science (B.Sc.) in Physics, Math
Professional and Public Service
Awards
R&D 100 Award (2023)
PowerModelsONM: Optimizing Operations of Networked Microgrids for Resilience
R&D 100 Award (2019)
For development of Severe Contingency Solver (Los Alamos National Laboratory Team)
58th Meeting of Nobel Laureates at Lindau: Physics, Attendee (2008)
560 young scientists selected (only 50 from the US) out of 20,000 applicants
Louisiana Board of Regents Graduate Fellowship Grant (2006-2010)
Graduate Studeis support. One award out of approx. 15 incoming graduate applicants in Physics.
Publications
Publications: 44
Citations: 1411
(Google Scholar)
27th International Conference on Electricity Distribution (CIRED 2023) 2023, 1919
doi: 10.1049/icp.2023.1073
Quantifying resiliency benefits of networked microgrids using PowerModelsONM.jl
D. M. Fobes, R. Bent, R. Jain, F. Flores-Espino, A. Pratt, R. Mahoney, G. Walker, D. Pinney, T. Patel, M. J. Reno
On the Feasibility of Market Manipulation and Energy Storage Arbitrage via Load‑Altering Attacks
Juan Ospina, David M. Fobes, Russell Bent
Modeling and Rapid Prototyping of Integrated Transmission‑Distribution OPF Formulations with PowerModelsITD.jl
Juan Ospina, David M. Fobes, Russell Bent, Andreas Wächter
Optimal Microgrid Networking for Maximal Load Delivery in Phase Unbalanced Distribution Grids: A Declarative Modeling Approach
David M Fobes, Harsha Nagarajan, Russell Bent
Topological magnon band structure of emergent Landau levels in a skyrmion lattice
T. Weber, D. M. Fobes, J. Waizner, P. Steffens, G. S. Tucker, M. Böhm, L. Beddrich, C. Franz, H. Gabold, R. Bewley, D. Voneshen, M. Skoulatos, R. Georgii, G. Ehlers, A. Bauer, C. Pfleiderer, P. Böni, M. Janoschek, M. Garst
Electronic properties of the bulk and surface states of Fe1+yTe1−xSex
Y. Li, N. Zaki, V. O. Garlea, A. T. Savici, D. M. Fobes, Z. Xu, F. Camino, C. Petrovic, G. Gu, P. D. Johnson, J. M. Tranquada, I. A. Zaliznyak
PowerModelsRestoration.jl: An open-source framework for exploring power network restoration algorithms
N. Rhodes, D. M. Fobes, C. Coffrin, L. Roald
Proceedings of the Eleventh ACM International Conference on Future Energy Systems e-Energy '20, 503
doi: 10.1145/3396851.3402121
A Flexible Storage Model for Power Network Optimization
F. Geth, C. Coffrin, D. M. Fobes
PowerModelsDistribution.jl: An open-source framework for exploring distribution power flow formulations
D. M. Fobes, S. Claeys, F. Geth, C. Coffrin
Skyrmion lattice creep at ultra-low current densities
Y. Luo, S.-Z. Lin, M. Leroux, N. Wakeham, D. M. Fobes, E. D. Bauer, J. B. Betts, J. D. Thompson, A. Migliori, M. Janoschek, B. Maiorov
The ISTI Rapid Response on Exploring Cloud Computing 2018
Carleton Coffrin, James Arnold, Stephan Johannes Eidenbenz, Derek Aberle, J. J. Ambrosiano, Zachary K. Baker, Sara Brambilla, Michael Brown, K. Nolan Carter, Pinghan Chu, Patrick Conry, Keeley Costigan, Ariane Eberhardt, David M. Fobes, Adam Gausmann, Sean Harris, Donovan Heimer, Marlin Holmes, Bill Junor, Csaba Kiss, Steve Linger, Rodman Ray Linn, Li-Ta Lo, Jonathan MacCarthy, Omar E. Marcillo, Clay McGinnis, Alexander McQuarters, Eric Michalak, Arvind Mohan, Matt Nelson, Diane Oyen, Nidhi Parikh, Donatella Pasqualini, Aaron Scott Pope, Reid B. Porter, Chris Rawlings, Hannah Reinbolt, Reid D. Rivenburgh, Philip Romero, Kevin Schoonover, Alexei N. Skurikhin, Daniel R. Tauritz, Dima Tretiak, Zhehui Wang, James Wernicke, Bradley T Wolfe, Phillip Justin Jr. Wolfram, Jonathan Woodring
Tunable Emergent Heterostructures in a Prototypical Correlated Metal
D. M. Fobes, S. Zhang, S.-Z. Lin, P. Das, N. J. Ghimire, E. D. Bauer, J. D. Thompson, L. W. Harriger, G. Ehlers, A. Podlesnyak, R. I. Bewley, A. Sazonov, V. Hutanu, F. Ronning, C. D. Batista, and M. Janoschek
Anisotropic magnetocrystalline coupling of the skyrmion lattice in MnSi
Y. Luo, S.-Z. Lin, D. M. Fobes, Z. Liu, E. D. Bauer, J. B. Betts, A. Migliori, J. D. Thompson, M. Janoschek, and B. Maiorov
Elasticity in the skyrmion phase unveils depinning at ultra-low current densities
Y. Luo, S.-Z. Lin, M. Leroux, N. Wakeham, D. M. Fobes, E. D. Bauer, J. B. Betts, J. D. Thompson, A. Migliori, M. Janoschek, B. Maiorov
Realization of the Axial Next-Nearest-Neighbor Ising model in U3Al2Ge3
D. M. Fobes, S.-Z. Lin, N. J. Ghimire, E. D. Bauer, J. D. Thompson, M. Bleuel, L. M. DeBeer-Schmitt, and M. Janoschek
Solving quantum riddles with neutron scattering
D. M. Fobes, M. Janoschek
Versatile Strain-Tuning of Modulated Long-Period Magnetic Structures
D. M. Fobes, Y. Luo, N. Leon, E. D. Bauer, V. R. Fanelli, M. A. Taylor, L. M. DeBeer-Schmitt, and M. Janoschek
Ordered hydroxyls on Ca3Ru2O7(001)
D. Halwidl, W. Mayr-Schmölzer, D. Fobes, J. Peng, Z. Q\. Mao, M. Schmid, F. Mittendorfer, J. Redinger, and U. Diebold
Low temperature magnetic structure of CeRhIn5 by neutron diffraction on absorption-optimized samples
D. M. Fobes, E. D. Bauer, J. D. Thompson, A. Sazonov, V. Hutanu, F. Ronning, and M. Janoschek
Forbidden phonon: Dynamical signature of bond symmetry breaking in the iron chalcogenides
D. Fobes, I. A. Zaliznyak, J. M. Tranquada, Z. Xu, G. Gu, X.-G. He, W. Ku, Y. Zhao, M. Matsuda, V. Garlea, and B. Winn
Adsorption of Water at the SrO Surface of Ruthenates
D. Halwidl, B. Stöger, W. Mayr-Schmölzer, J. Pavelec , D. M. Fobes, J. Peng, Z. Q. Mao, G. Parkinson, M. Schmid, F. Mittendorfer, J. Redinger, and U. Diebold
Point Defects at Cleaved Sr(n+1)Ru(n)O(3n+1) (001) Surfaces
B. Stöger, M. Hieckel, F. Mittendorfer, Z. Wang, M. Schmid, G. S. Parkinson, D. M. Fobes, J. Peng, J. E. Ortmann, A. Limbeck, Z. Q. Mao, J. Redinger, and U. Diebold
High chemical activity of a perovskite surface: Reaction of CO with Sr3Ru2O7
B. Stöger, M. Hieckel, F. Mittendorfer, Z. Wang, D. Fobes, J. Peng, Z. Q. Mao, M. Schmid, J. Redinger, and U. Diebold
Cluster Nucleation and Growth from a Highly Supersaturated Adatom Phase: Silver on Magnetite
R. Bliem, R. Kosak, L. Perneczky, Z. Novotny, O. Gamba, D. Fobes, Z. Q. Mao, M. Schmid, U. Diebold, P. Blaha, and G. S. Parkinson
Ferro-Orbital Ordering Transition in Iron Telluride Fe(1+y)Te
D. Fobes, I. A. Zaliznyak, Z. Xu, R. Zhong, G. Gu, J. M. Tranquada, L. Harriger, D. Singh, O. Garlea, M. Lumsden, and B. Winn
Enhanced spin-triplet superconductivity near dislocations in Sr2RuO4
Y. A. Ying, N. E. Staley, Y. Xin, K. Sun, X. Cai, D. Fobes, T. J. Liu, Z. Q. Mao, and Y. Liu
From quasi-two-dimensional metal with ferromagnetic bilayers to Mott insulator with G-type antiferromagnetic order in Ca3(Ru(1-x)Ti(x))2O7
J. Peng, X. Ke, G. C. Wang, J. E. Ortmann, D. Fobes, T. Hong, W. Tian, X. S. Wu, and Z. Q. Mao
Unconventional quantum oscillations in mesoscopic rings of spin-triplet superconductor Sr2RuO4
X. Cai, Y. A. Ying, N. E. Staley, Y. Xin, D. Fobes, T. J. Liu, Z. Q. Mao, and Y. Liu
Effect of disorder on quantum phase transition in the double layered ruthenates (Sr(1-x)Ca(x))3Ru2O7
Z. Qu, J. Peng, T. J. Liu, D. Fobes, V. Dobrosavljevic, L. Spinu, and Z. Q. Mao
Ferromagnetism in CuFeSb: Evidence of competing magnetic interactions in iron-based superconductors
B. Qian, J. Lee, J. Hu, G. C. Wang, P. Kumar, M. H. Fang, T. J. Liu, D. Fobes, H. Pham, L. Spinu, X. S. Wu, M. Green, S. H. Lee, and Z. Q. Mao
Metal-insulator transition in doped Ca2RuO4: potential application in bolometric detection
D. Fobes, E. Vehstedt, G. C. Wang, T. J. Liu, Z. Q. Mao
Friedel-like Oscillations from Interstitial Iron in Superconducting Fe(1+y)Te0.62Se0.38
V. Thampy, J. Kang, J. A. Rodriguez-Rivera, W. Bao, A. T. Savici, J. Hu, T. J. Liu, B. Qian, D. Fobes, Z. Q. Mao, C. B. Fu, W. C. Chen, Q. Ye, R. W. Erwin, T. R. Gentile, Z. Tesanovic, and C. Broholm
Magnetic phase transitions and bulk spin-valve effect tuned by in-plane field orientation in Ca3Ru2O7
D. Fobes, J. Peng, Z. Qu, T. J. Liu, and Z. Q. Mao
From (pi, 0) magnetic order to superconductivity with (pi,pi) magnetic resonance in Fe1.02(Te(1-x)Se(x))
T. J. Liu, J. Hu, B. Qian, D. M. Fobes, Z. Q. Mao, W. Bao, M. Reehuis, S. A. J. Kimber, K. Prokes, S. Matas, D. N. Argyriou, A. Hiess, A. Rotaru, H. Pham, L. Spinu, Y. Qiu, V. Thampy, A. T. Savici, J. A. Rodriguez, and C. Broholm
Interplay between the lattice and spin degrees of freedom in (Sr(1-x)Ca(x))3Ru2O7
J. Peng, Z. Qu, B. Qian, D. Fobes, T. J. Liu, X. Wu, H. M. Pham, L. Spinu, and Z. Q. Mao
Anisotropy of magnetoresistivities in Sr4Ru3O10: Evidence for an orbital-selective metamagnetic transition
D. Fobes, T. J. Liu, Z. Qu, H. Q. Yuan, M. Salamon, M. Zhou, J. Hooper, and Z. Q. Mao
Doping and dimensionality effects on the core-level spectra of layered ruthenates
H. Guo, Y. Li, D. Urbina, B. Hu, R. Jin, T. Liu, D. Fobes, Z. Q. Mao, E. W. Plummer, and J. Zhang
Suppression of Proximity Effect and the Enhancement of p-Wave Superconductivity in the Sr2RuO4-Ru System
Y. A. Ying, Y. Xin, B. W. Clouser, E. Hao, N. E. Staley, R. J. Myers, L. F. Allard, D. Fobes, T. Liu, Z. Q. Mao, and Y. Liu
Charge carrier localization induced by excess Fe in the superconductor Fe(1+y)Te(1-x)Se(x)
T. J. Liu, X. Ke, B. Qian, J. Hu, D. M. Fobes, E. K. Vehstedt, H. Pham, J. H. Yang, M. H. Fang, L. Spinu, P. Schiffer, Y. Liu, Z. Q. Mao
Complex electronic states in double-layered ruthenates (Sr(1-x)Ca(x))3Ru2O7
Z. Qu, J. Peng, T. J. Liu, D. Fobes, L. Spinu, and Z. Q. Mao
Journal of Physics Conference Series 150, 042134
doi: 10.1088/1742-6596/150/4/042134
Real-space observation of magnetic domain structure at metamagnetic tansition in a triple-layer ruthenate Sr4Ru3O10
Y. Nakajima, Y. Matsumoto, D. Fobes, M. Zhou, Z. Q. Mao, and T. Tamegai
Unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio in the double layered ruthenates (Sr(1-x)Ca(x))3Ru2O7
Z. Qu, L. Spinu, H. Yuan, V. Dobrosavljević, W. Bao, J. W. Lynn, M. Nicklas, J. Peng, T. Liu, D. Fobes, E. Flesch, and Z. Q. Mao
Band-Dependent Normal-State Coherence in Sr2RuO4: Evidence from Nernst Effect and Thermopower Measurements
X. Xu, Z. Xu, T. Liu, D. Fobes, Z. Mao, Y. Liu
Magnetic, electrical transport, and thermoelectric properties of Sr4Ru3O10: Evidence for a field-induced electronic phase transition at low temperatures
Z. Xu, X. Xu, R. Freitas, Z. Long, M. Zhou, D. Fobes, M. Fang, P. Schiffer, Z. Mao, and Y. Liu
Phase diagram of the electronic states of trilayered ruthenate Sr4Ru3O10
D. Fobes, M. H. Yu, M. Zhou, J. Hooper, C. J. O'Connor, M. Rosario, and Z. Q. Mao
Competing magnetic fluctuations in Sr3Ru2O7 probed by Ti doping
J. Hooper, M. H. Fang, M. Zhou, D. Fobes, N. Dang, Z. Q. Mao, C. M. Feng, Z. A. Xu, M. H. Yu, C. J. O'Connor, G. J. Xu, N. Andersen, and M. Salamon
Electronic and magnetic properties of triple-layered ruthenate Sr4Ru3O10 single crystals grown by a floating-zone method
M. Zhou, J. Hooper, D. Fobes, Z. Q. Mao, V. Golubb and C. J. O'Connor
Presentations
IEEE PES General Meeting 2023
Orlando, FL
Optimal Microgrid Networking for Maximal Load Delivery in Phase Unbalanced Distribution Grids: A Declarative Modeling Approach
CIRED 2023: International Conference & Exhibition on Electricity Distribution
Rome, Italy
Quantifying Resiliency Benefits of Networked Microgrids using PowerModelsONM.jl
2022 INFORMS Annual Meeting
Indianappolis, IN
Optimizing Operations of Networked Microgrids in Response to Severe Contingencies
2021 INFORMS Annual Meeting
Anaheim, CA
PowerModels: A Framework for Exploring Power Flow Formulations
JuliaCon 2021
Virtual
Unbalanced Power Flow Optimization with PowerModelsDistribution
2020 INFORMS Annual Meeting
Virtual
PowerModelsDistribution.jl: Exploring Optimal Power Flow In Distribution Networks
Power Systems Computation Conference 2020
Virtual
PowerModelsDistribution.jl: An open-source framework for exploring distribution power flow formulation
American Conference on Neutron Scattering
College Park, Maryland
Spin excitations of the skyrmion lattice in MnSi
International Conference on Strongly Correlated Electron Systems (SCES)
Prague, Czech Republic
Magnetic frustration in a prototypical strongly correlated metal
International Conference on Neutron Scattering (ICNS)
Daejeon, South Korea
Magnetic frustration in a prototypical strongly correlated metal
APS March Meeting
New Orleans, LA
Magnetic frustration in a prototypical strongly correlated electron system
American Conference on Neutron Scattering
Long Beach, CA
Magnetic frustration induced by applied magnetic field in CeRhIn5
APS March Meeting
Baltimore, MD
Spin wave spectrum of CeRhIn5 under applied magnetic field
APS March Meeting
San Antonio, TX
"Forbidden" phonon in the iron chalcogenide series
American Conference on Neutron Scattering
Knoxville, TN
Observation of an acoustic mode potentially driven by an imbalance between the magnetic moments of neighboring Fe atoms in Fe(1-x)Te (y < 0.12)
APS March Meeting
Denver, CO
Observation of acoustic-phonon-like mode driven by magnetic imbalance between neighboring Fe atoms in Fe(1+y)Te (y<0.12)
APS March Meeting
Baltimore, MD
Unconventional (pi, pi) order in Fe1.1Te
APS March Meeting
Boston, MA
Anisotropy of magnetoresistivities in Sr3Ru2O7: Evidence for orbital-dependent metamagnetism
APS March Meeting
Dallas, TX
Metastable Magnetic states in Ca3Ru2O7
APS March Meeting
Portland, OR
Anisotropic magnetic coupling in Ca3Ru2O7 probed by angle resolved magnetotransport
APS March Meeting
Pittsburgh, PA
Probing orbital-dependent magnetism in layered perovskite ruthenates through angle-dependent magnetoresistivity
APS March Meeting
New Orleans, LA
Anisotropy of magnetoresistivity in trilayered ruthenate Sr4Ru3O10: Evidence for orbital dependent metamagnetism
APS March Meeting
Denver, CO