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

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

Energies 16, 1670

doi: 10.3390/en16041670

On the Feasibility of Market Manipulation and Energy Storage Arbitrage via Load‑Altering Attacks

Juan Ospina, David M. Fobes, Russell Bent

IEEE Transactions on Power Systems ,

doi: 10.1109/TPWRS.2023.3234725

Modeling and Rapid Prototyping of Integrated Transmission‑Distribution OPF Formulations with PowerModelsITD.jl

Juan Ospina, David M. Fobes, Russell Bent, Andreas Wächter

IEEE Transactions on Smart Grid ,

doi: 10.1109/TSG.2022.3208508

Optimal Microgrid Networking for Maximal Load Delivery in Phase Unbalanced Distribution Grids: A Declarative Modeling Approach

David M Fobes, Harsha Nagarajan, Russell Bent

Science 375, 1025

doi: 10.1126/science.abe4441

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

Nature Materials 20, 1221

doi: 10.1038/s41563-021-00984-7

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

Electric Power Systems Research 190, 106736

doi: 10.1016/j.epsr.2020.106736

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

Electric Power Systems Research 189, 106664

doi: 10.1016/j.epsr.2020.106664

PowerModelsDistribution.jl: An open-source framework for exploring distribution power flow formulations

D. M. Fobes, S. Claeys, F. Geth, C. Coffrin

Communications Materials 1, 83

doi: 10.1038/s43246-020-00083-1

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

arXiv 1901.01331, [cs.DC]

doi: 10.48550/arXiv.1901.01331

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

Nature Physics 14, 456

doi: 10.1038/s41567-018-0060-9

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

Phys. Rev. B 97, 104423

doi: 10.1103/PhysRevB.97.104423

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

arXiv:1711.08873 [cond-mat.str-el] (submitted to PNAS) ,

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

Physical Review B 96, 174413

doi: 10.1103/PhysRevB.96.174413

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

Institute of Physics: JPhys+ ,

Solving quantum riddles with neutron scattering

D. M. Fobes, M. Janoschek

Applied Physics Letters 110, 192409

doi: 10.1063/1.4983473

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

Nature Communications 8, 23

doi: 10.1038/s41467-017-00066-w

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

Journal of Physics: Condensed Matter 29, 17LT01

doi: 10.1088/1361-648X/aa6696

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

Physical Review B 94, 121103(R)

doi: 10.1103/PhysRevB.94.121103

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

Nature Materials 15, 450

doi: 10.1038/NMAT4512

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

Physical Review B 90, 165438

doi: 10.1103/PhysRevB.90.165438

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

Physical Review Letters 113, 116101

doi: 10.1103/PhysRevLett.113.116101

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

ACS Nano 8, 7531

doi: 10.1021/nn502895s

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

Physical Review Letters 112, 187202

doi: 10.1103/PhysRevLett.112.187202

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

Nature Communications 4, 2596

doi: 10.1038/ncomms3596

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

Physical Review B 87, 085125

doi: 10.1103/PhysRevB.87.085125

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

Physical Review B 87, 081104

doi: 10.1103/PhysRevB.87.081104

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

Physical Review B 86, 014434

doi: 10.1103/PhysRevB.86.014434

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

Physical Review B 85, 144427

doi: 10.1103/PhysRevB.85.144427

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

Journal of Applied Physics 111, 083709

doi: 10.1063/1.4704387

Metal-insulator transition in doped Ca2RuO4: potential application in bolometric detection

D. Fobes, E. Vehstedt, G. C. Wang, T. J. Liu, Z. Q. Mao

Physical Review Letters 108, 107002

doi: 10.1103/PhysRevLett.108.107002

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

Phys. Rev. B 84, 014406

doi: 10.1103/PhysRevB.84.014406

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

Nature Materials 9, 716

doi: 10.1038/NMAT2800

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

Physical Review B 82, 024417

doi: 10.1103/PhysRevB.82.024417

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

Physical Review B 81, 172402

doi: 10.1103/PhysRevB.81.172402

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

Physical Review B 81, 155121

doi: 10.1103/PhysRevB.81.155121

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

Physical Review Letters 103, 247004

doi: 10.1103/PhysRevLett.103.247004

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

Physical Review B 80, 174509

doi: 10.1103/PhysRevB.80.174509

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

Physical Review B 80, 115130

doi: 10.1103/PhysRevB.80.115130

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

Physical Review B 78, 180407(R)

doi: 10.1103/PhysRevB.78.180407

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

Physical Review Letters 101, 057002

doi: 10.1103/PhysRevLett.101.057002

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

Physical Review B 76, 094405

doi: 10.1103/PhysRevB.76.094405

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

Physical Review B 75, 094429

doi: 10.1103/PhysRevB.75.094429

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

Physical Review B 75, 060403(R)

doi: 10.1103/PhysRevB.75.060403

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

Materials Research Bulletin 40, 942

doi: 10.1016/j.materresbull.2005.03.004

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

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

Competing magnetic fluctuations in Sr3Ru2O7 probed by Ti doping