Publications

Bold: FINO Lab Group; Italics: Auburn collaborators

Pending

• Gaurab Rimal, Tanzila Tasnim, Gabriel Calderon Ortiz, George Sterbinsky, Jinwoo Hwang, and Ryan B. Comes. “Strain-dependent Insulating State and Kondo Effect in Epitaxial SrIrO₃ Films,” Submitted for publication.
• Bhavesh Ramkorun, Gautam Chandrasekhar, Vijaya Rangari, Saikat C. Thakur, Ryan B. Comes, and Edward Thomas Jr. “Comparing growth of titania and carbonaceous dusty nanoparticles in weakly magnetised capacitively coupled plasmas,” Submitted for publication. arxiv:2402.00951 [physics.plasm-ph]

2024

• Gaurab Rimal and Ryan B. Comes. “Development of Complex Oxide Quantum Materials via Molecular Beam Epitaxy,” Journal of Physics D: Applied Physics, Invited review, 57, 193001, May 2024. DOI: 10.1088/1361-6463/ad2569
• Bhavesh Ramkorun, Swapneal Jain, Adib Taba, Masoud Mahjouri-Samani, Michael E. Miller, Saikat C. Thakur, Edward Thomas Jr., and Ryan B. Comes. “Introducing dusty plasma particle growth of nanospherical titanium dioxide,” Applied Physics Letters, 124, 144102, Apr 2024. DOI: 10.1063/5.0186797 Pre-print: arXiv:2310.17521 [physics.plasm-ph]
• Sharad Mahatara, Ryan B. Comes, and Boris Kiefer. “Enhanced Carrier Densities in Two-Dimensional Electron Gas Formed at BaSnO₃/SrTaO₃ and SrSnO₃/SrTaO₃ Interfaces,” Journal of Physics: Condensed Matter, 36, 145001, Apr 2024. DOI: 10.1088/1361-648X/ad17f8

2023

• Rajendra Paudel, Andricus R. Burton, Marcelo A. Kuroda, Byron H. Farnum, and Ryan B. Comes. “Band-Engineered LaFeO₃-LaNiO₃ Thin Film Interfaces for Electrocatalysis of Water,” Journal of Vacuum Science and Technology A, 41, 063207, Dec 2023. DOI: 10.1116/6.0002987 Pre-print: arXiv:2207.07264 [cond-mat.mtrl-sci]
• Miles D. Blanchet, Bethany E. Matthews, Steven R. Spurgeon, Steve M. Heald, Tamara Isaacs-Smith, and Ryan B. Comes. “Jahn-Teller-driven Phase Segregation in Mn_xCo_3-xO₄ Spinel Thin Films,” Journal of Vacuum Science and Technology A, 41, 052703, Sep 2023. DOI: 10.1116/6.0002329 Pre-print: arXiv:2210.16092 [cond-mat.mtrl-sci]
• Sujan Budhathoki, Anish Rai, Ka Ming Law, Ridwan Nahar, Andrew Stewart, Smriti Ranjit, Shambhu KC, Tamara Isaacs-Smith, Ilias Bikmukhametov, Ryan B. Comes, Gregory B. Thompson, Patrick LeClair, Tim Mewes, and Adam J. Hauser. “Co₂Fe(Ti_0.5Al_0.5) epitaxial thin films: Structural and magnetic properties of a Heusler alloy with Z-site transition metal Ti substitution,” Journal of Magnetism and Magnetic Materials, 582, 170946, Sep 2023. DOI: 10.1016/j.jmmm.2023.170946
• Sreejith Nair, Zhifei Yang, Dooyong Lee, Silu Guo, Jerzy T. Sadowski, Spencer Johnson, Abdul Saboor, Ryan B. Comes, Wencan Jin, K. Andre Mkhoyan, Anderson Janotti, and Bharat Jalan. “Engineering Metal Oxidation using Epitaxial Strain,” Nature Nanotechnology, 18, 1005-1011, Sep 2023. DOI: 10.1038/s41565-023-01397-0

2022

• Arka Sardar, Tamara Isaacs-Smith, Jacob Lawson, Thaddeus Asel, Ryan Comes, Joseph N. Merrett, and Sarit Dhar. “High conductivity β-Ga₂O₃ formed by hot ion implantation,” Applied Physics Letters, 121, 262101, Dec 2022. DOI: 10.1063/5.0127457
• Amanda Chown, Humaira Yeasmin, Rajendra Paudel, Ryan B. Comes, and Byron H. Farnum. “Lithium Dependent Electrochemistry of p-Type Nanocrystalline CuCrO₂ Films,” ChemElectroChem, 9, e202200825, Dec 2022. DOI: 10.1002/celc.202200825 Cover Art: 10.1002/celc.202201066
• Sharad Mahatara*, Suresh Thapa*, Hanjong Paik , Ryan Comes, and Boris Kiefer. “High Mobility Two-Dimensional Electron Gas at the BaSnO₃/SrNbO₃ Interface,” ACS Applied Materials and Interfaces, 14, 45025-45031, Oct 2022. DOI: 10.1021/acsami.2c12195 *Equal contribution Pre-print: arXiv:2206.12028 [cond-mat.mtrl-sci]
• Suresh Thapa, Sydney R. Provence, Patrick T. Gemperline, Steven R. Spurgeon, Bethany E. Matthews, Sydney L. Battles, Steve M. Heald, Marcelo A. Kuroda, and Ryan B. Comes. “Surface Stability of SrNbO_3+δ Grown by Hybrid Molecular Beam Epitaxy,” APL Materials, 10, 091112, Sep 2022. DOI: 10.1063/5.0097699
• Alexandria R. C. Bredar*, Miles D. Blanchet*, Andricus R. Burton, Bethany Matthews, Steven R. Spurgeon, Ryan B. Comes, and Byron H. Farnum. “Oxygen Reduction Electrocatalysis with Epitaxially Grown Spinel MnFe₂O₄ and Fe₃O₄,” ACS Catalysis, 12, 3577-3588, Mar 2022. DOI: 10.1021/acscatal.1c05172 *Equal contribution Pre-print: arXiv:2111.06229 [cond-mat.mtrl-sci]
• Andricus R. Burton^*, Rajendra Paudel^*, Bethany Matthews, Michel Sassi, Steven R. Spurgeon, Byron H. Farnum, and Ryan B. Comes. “Thickness Dependent OER Electrocatalysis of Epitaxial LaFeO₃ Thin Films,” Journal of Materials Chemistry A, 10, 1909-1918, Jan 2022. DOI: 10.1039/D1TA07142D *Equal contribution Pre-print: arXiv:2108.09360 [cond-mat.mtrl-sci]
• Eren Suyolcu, Georg Christiani, Patrick T. Gemperline, Sydney R. Provence, Annette Bussmann-Holder, Ryan B. Comes, Peter A. van Aken, and Gennady Logvenov. “Engineering ordered arrangements of oxygen vacancies at the surface of superconducting La₂CuO₄ thin films,” Journal of Vacuum Science and Technology A, 40, 013214, Jan 2022. DOI: 10.1116/6.0001473

2021

• Jason Lapano, Yun-Yi Pai, Alessandro Mazza, Jie Zhang, Tamara Isaacs-Smith, Patrick Gemperline, Lizhi Zhang, Haoxiang Li, Ho Nyung Lee, Hu Miao, Gyula Eres, Mina Yoon, Ryan Comes, T. Zac Ward, Benjamin J. Lawrie, Michael McGuire, Robert G. Moore, Christopher T. Nelson, Andrew May, and Matthew Brahlek. “Self-regulated growth of candidate topological superconducting parkerite by molecular beam epitaxy,” APL Materials, 9, 101110, Oct 2021. DOI: 10.1063/5.0064746 Pre-print: arXiv:2107.07021 [cond-mat.mtrl-sci]
• Suresh Thapa, Sydney R. Provence, Devin Jessup, Jason Lapano, Matthew Brahlek, Jerzy T. Sadowski, Petra Reinke, Wencan Jin, and Ryan B. Comes. “Correlating surface stoichiometry and termination in SrTiO₃ films grown by hybrid molecular beam epitaxy,” Journal of Vacuum Science and Technology A, 39, 053203, Sep 2021. DOI: 10.1116/6.0001159 Pre-print: arXiv:2004.00069 [cond-mat.mtrl-sci]
• Tiffany C. Kaspar, Steven R. Spurgeon, Bethany E. Matthews, Mark E. Bowden, Steve M. Heald, Le Wang, Ron Kelley, Rajendra Paudel, Tamara Isaacs-Smith, Ryan B. Comes, Xinmao Yin, Chi Sin Tang, Andrew T.S. Wee, and Scott A. Chambers. “Incorporation of Ti in epitaxial Fe₂TiO₄ thin films,” Journal of Physics: Condensed Matter, 33, 314004, June 2021. DOI: 10.1088/1361-648X/ac0571
• Suresh Thapa+, Rajendra Paudel+, Miles Blanchet+, Patrick Gemperline+ and Ryan B. Comes. “Probing surfaces and interfaces in complex oxide films via in situ X-ray photoelectron spectroscopy,” Journal of Materials Research, 36, 26-51, Jan 2021. DOI: 10.1557/s43578-020-00070-9 +Equal contribution
• Miles D. Blanchet, Jonathan J. Heath, Tiffany C. Kaspar, Bethany E. Matthews, Steven R. Spurgeon, Mark E. Bowden, Steve M. Heald, Tamara Issacs-Smith, Marcelo A. Kuroda, and Ryan B. Comes. “Electronic and Structural Properties of Single-crystal Jahn-Teller Active Co_1+xMn_2-xO₄ Thin Films,” Journal of Physics: Condensed Matter, 33, 124002, Jan 2021. DOI: 10.1088/1361-648X/abd573

2020

• Sydney R. Provence, Suresh Thapa, Rajendra Paudel, Tristan Truttmann, Abhinav Prakash, Bharat Jalan, and Ryan B. Comes. “Machine Learning Analysis of Perovskite Oxides Grown by Molecular Beam Epitaxy,” Physical Review Materials, 4, 083807, Aug 2020. DOI: 10.1103/PhysRevMaterials.4.083807. Pre-print: arXiv:2004.00080 [cond-mat.mtrl-sci]

2019

• Yuhan Wang, Jiawei Zhang, Yue Ni, Xinzhong Chen, Ryan Mescall, Tamara Isaacs-Smith, Ryan B. Comes, Salinporn Kittiwatanakul, Stuart A. Wolf , Jiwei Lu, Mengkun Liu. “Structural, Transport, and Ultrafast Dynamic Properties of V_1-xNb_xO₂ Thin Films,” Physical Review B, 99, 245129, Jun 2019. DOI: 10.1103/PhysRevB.99.245129
• Alexandria C. Bredar, Miles D. Blanchet, Ryan B. Comes, and Byron H. Farnum. “Evidence and Influence of Copper Vacancies in p-Type CuGaO₂ Mesoporous Films,” ACS Applied Energy Materials, 2(1), 19-28, Jan 2019. DOI: 10.1021/acsaem.8b01558
• Tiffany Kaspar, Peter Sushko, Steven Spurgeon, Mark Bowden, David Keavney, Ryan Comes, Sahar Saremi, Lane Martin and Scott Chambers. “Band offset and built-in potential at LaMnO₃/SrTiO₃ polar/non-polar heterostructures,” Advanced Materials Interfaces, 6 (1), 1801428, Jan 2019. DOI: 10.1002/admi.201801428

2018

• Shih-Chieh Lin, Cheng-Tai Kuo, Ryan B. Comes, Julien E. Rault, Jean-Pascal Rueff, Slavomir Nemšák, Amina Taleb, Jeffrey B. Kortright, Julia Meyer-Ilse, Eric Gullikson, Peter V. Sushko, Steven R. Spurgeon, Mathias Gehlmann, Lukasz Plucinski, Scott A. Chambers, and Charles S. Fadley. “Interface properties and built-in potential profile of a LaCrO₃/SrTiO₃ superlattice determined by standing-wave excited photoemission spectroscopy,” Physical Review B, 98, 165214, Oct 2018. DOI: 10.1103/PhysRevB.98.165124
• Tiffany C. Kaspar, Seungbum Hong, Mark E. Bowden, Tamas Varga, Pengfei Yan, Chongmin Wang, Steven R. Spurgeon, Ryan B. Comes, Pradeep Ramuhalli & Charles H. Henager Jr. “Tuning piezoelectric properties through epitaxy of La₂Ti₂O₇ and related thin films,” Scientific Reports, 8, 3037, Feb 2018. DOI: 10.1038/s41598-018-21009-5

2017

• Steven R. Spurgeon, Peter V. Sushko, Scott A. Chambers, and  Ryan B. Comes. “Dynamic Interface Rearrangement in LaFeO₃ / n-SrTiO₃ Heterojunctions,” Physical Review Materials, 1, 063401, Nov 2017. DOI: 10.1103/PhysRevMaterials.1.063401  PNNL Highlight
  
• Ryan B. Comes, Daniel E. Perea, and Steven R. Spurgeon. “Heterogeneous Two-phase Pillars in Epitaxial NiFe₂O₄-LaFeO₃ Nanocomposites,” Advanced Materials Interfaces, 4, 1700396, Aug 2017. DOI: 10.1002/admi.201700396
• Kelsey A. Stoerzinger, Ryan B. Comes, Steven R. Spurgeon, Suntharapillai Thevuthasan, Kyuwook Ihm, Ethan J. Crumlin, Scott A. Chambers. “Influence of surface termination on water reactivity in LaFeO₃,” Journal of Physical Chemistry Letters, 8, 1038-1043, Mar 2017. DOI: 10.1021/acs.jpclett.7b00195
• Scott A. Chambers, Yingge Du, Ryan B. Comes, Steven R. Spurgeon, and Peter V. Sushko. “The Effects of Core-level Broadening in Determining Band Alignment at the Epitaxial SrTiO₃(001)/p-Ge(001) heterojunction,” Applied Physics Letters, 110, 082104, Feb 2017. DOI: 10.1063/1.4977422
• Ryan B. Comes, Steven R. Spurgeon, Mark H. Engelhard, Despoina M. Kepaptsoglou, Tiffany C. Kaspar, Quentin M. Ramasse, Peter V. Sushko, and Scott A. Chambers. “Probing the Origin of Interfacial Carriers in SrTiO₃-LaCrO₃ Superlattices,” Chemistry of Materials, 29, 1147–1155, Feb 2017. DOI: 10.1021/acs.chemmater.6b04329

2016

• Ryan B. Comes and Scott A. Chambers. “Interface structure, band alignment and built-in potentials at LaFeO₃/n-SrTiO₃ heterojunctions,” Physical Review Letters, 117, 226802, Nov 2016. DOI: 10.1103/PhysRevLett.117.226802
• Peng Xu, Yilikal Ayino, Christopher Cheng, Vlad Pribiag, Ryan B. Comes, Peter V. Sushko, Scott A. Chambers and Bharat Jalan. “Understanding and controlling charge density in the two-dimensional electron gas at a polar/non-polar oxide interface,” Physical Review Letters, 117, 106803, Sep 2016. DOI: 10.1103/PhysRevLett.117.106803 PNNL Highlight
  
• Ryan B. Comes, Steven R. Spurgeon, Steve M. Heald, Despoina M. Kepaptsoglou, Lewys Jones, Phuong Vu Ong, Mark E. Bowden, Quentin M. Ramasse, Peter V. Sushko, and Scott A. Chambers. “Interface-induced Polarization in SrTiO₃-LaCrO₃ Superlattices,” Advanced Materials Interfaces, 3(10), 1500779, May 2016. DOI: 10.1002/admi.201500779 Pre-print PNNL Highlight
  
• Ryan B. Comes, Tiffany C. Kaspar, Steve M. Heald, Mark E. Bowden and Scott A. Chambers. “Infrared optical absorption in low-spin Fe^2+-doped SrTiO₃,” Journal of Physics: Condensed Matter, 28(3), 035901, Jan 2016. DOI: 10.1088/0953-8984/28/3/035901
• Yuhan Wang, Ryan B. Comes, Stuart A. Wolf, and Jiwei Lu. “Electrically induced resistive switching in Nb/NbO₂/TiN vertical devices,” IEEE Journal of the Electron Devices Society, 4(1), 11-14, Jan 2016. DOI: 10.1109/JEDS.2015.2503922
• Xiaopu Li, Chung T. Ma, Jiwei Lu, Arun Devaraj, Steven R. Spurgeon, Ryan B. Comes, and S. Joseph Poon. “Self Exchange Bias and Bistable Magneto-Resistance States in Amorphous TbFeCo thin Films,” Applied Physics Letters, 108, 012401, Jan 2016. DOI: 10.1063/1.4939240

2015

• Ryan B. Comes, Peng Xu, Bharat Jalan, and Scott A. Chambers. “Band alignment of epitaxial SrTiO₃ thin films with (LaAlO₃)_0.3-(Sr₂AlTaO₆)_0.7 (001),” Applied Physics Letters, 107, 131601, Sep 2015. DOI: 10.1063/1.4932063
• Ryan Comes, Kerry Siebein, Jiwei Lu and Stuart A. Wolf. “Microstructural Effects of Chemical Island Templating in Patterned Matrix-Pillar Oxide Nanocomposites,” CrystEngComm, 17, 2041, Mar 2015. DOI: 10.1039/C5CE00025D 
• Ryan B. Comes, Sergey Y. Smolin, Tiffany C. Kaspar, Ran Gao, Brent A. Apgar, Lane W. Martin, Mark E. Bowden, Jason B. Baxter, and Scott A. Chambers. “Visible light carrier generation in co-doped epitaxial titanate films,” Applied Physics Letters, 109, 092901, Mar 2015. DOI: 10.1063/1.4913930
• Yuhan Wang, Ryan B. Comes, Salinporn Kittiwatanakul, Stuart A. Wolf and Jiwei Lu. “Epitaxial niobium dioxide thin films by reactive-biased target ion beam deposition,”  Journal of Vacuum Science and Technology A, 33, 021516, Mar 2015. DOI: 10.1116/1.4906143
• Matthew A. Steiner, Ryan B. Comes, Jerrold A Floro. William A. Soffa and James M. Fitz-Gerald. “L1’ Ordering Evidence of L1₀-L1₂ Hybridization in Strained Fe_38.5-Pd_61.5 Epitaxial Films,” Acta Materialia, 85, 261-269, Feb 2015. DOI: 10.1016/j.actamat.2014.11.036

2014

• Ryan Comes, Peter V. Sushko, Steve M. Heald, Robert J. Colby, Mark E. Bowden, and Scott A. Chambers. “Band-Gap Reduction and Dopant Behavior in La, Cr Co-doped SrTiO₃ Thin Films,” Chemistry of Materials, 26, 7073-7082, Dec 2014. DOI: 10.1021/cm503541u    PNNL Highlight
  

2013

• Matthew A. Steiner, Ryan B. Comes, Vincent S. Smentkowski, Jerrold A. Floro, William A. Soffa, and James M. Fitz-Gerald. “Strain Induced Mircrostructural and Ordering Behaviors of Epitaxial Fe_38.5Pd_61.5 Films Grown by Pulsed Laser Deposition,” Journal of Vacuum Science and Technology A, 31, 050824, Aug 2013. DOI: 10.1116/1.4819376
• Hongxue Liu, Ryan Comes, Yonghang Pei, Jiwei Lu, and Stuart A. Wolf. “Structural, magnetic, and nanoscale switching properties of BiFeO₃ thin films grown by pulsed electron deposition,” Journal of Vacuum Science and Technology B, 31, 032801, May 2013. DOI: 10.1116/1.4802924
• Ryan Comes, Man Gu, Mikhail Khokhlov, Hongxue Liu, Jiwei Lu and Stuart A. Wolf. “Electron Molecular Beam Epitaxy: Layer-by-layer Growth of Complex Oxides via Pulsed Electron-beam Deposition,” Journal of Applied Physics, 113 (2), 023303, Jan 2013. DOI: 10.1063/1.4774238

2012

• Ryan Comes, Hongxue Liu, Mikhail Khokhlov, Richard Kasica, Jiwei Lu and Stuart A. Wolf. “Directed Self-Assembly of Epitaxial CoFe₂O₄-BiFeO₃ Nanocomposites,” Nano Letters, 12 (5), 2367-2373, May 2012. DOI: 10.1021/nl3003396
• Ryan Comes, Mikhail Khokhlov, Hongxue Liu, Jiwei Lu and Stuart A. Wolf. “Magnetic anisotropy in composite CoFe₂O₄-BiFeO₃ ultrathin films grown by pulsed-electron deposition,” Journal of Applied Physics, 111 (7), 07D914, Apr 2012. DOI: 10.1063/1.3676413
• Ryan Comes, Man Gu, Mikhail Khokhlov, Jiwei Lu and Stuart A. Wolf. “Microstructural and domain effects in epitaxial CoFe₂O₄ films on MgO with perpendicular magnetic anisotropy,” Journal of Magnetism and Magnetic Materials, 324 (4), 524-527, Feb 2012. DOI: 10.1016/j.jmmm.2011.08.033

2010

• Elon Terrell, Ryan Comes, and C. Fred Higgs. “Analysis of Feature-Scale Wear in Chemical Mechanical Polishing: Modeling and Experiments.” Tribology Letters, 37 (2), 327-336, Feb 2010. DOI: 10.1007/s11249-009-9524-5
• Ryan Comes, Elon Terrell, and C. Fred Higgs. “Pad Deflection-Based Model of Chemical Mechanical Polishing for Use in CAD IC Layout.” IEEE Transactions on Semiconductor Manufacturing, 23 (1), 121-131, Feb 2010. DOI: 10.1109/TSM.2009.2039182