Lab News

December 2022: Congrats, Xuanyi on winning the 2022 APL Materials 1st Place Excellence in Research Award! Read the Press Release here..




May 10, 2022: Xuanyi and Merve present posters at the American Ceramic Society Carolinas Section Meeting at UNC, Charlotte!

March 2022: New work led by NC-State Physics undergrads Yasemin Ozbek and Cooper Brooks showing how structure relates to superconductivity in thin titanium oxide films on arXiV

February 2022: Xuanyi and Aubrey’s paper on understanding how the structure of thin SrRuO3 films evolve as their thicknesses are reduced to a few atomic layers is now on the arXiv. The electronic and magnetic properties change with thickness and using synchrotron X-ray at the Advanced Photon Source and high-resolution electron microscopy we show how the crystal structure evolves with film thickness.

  • Xuanyi Zhang, Aubrey N. Penn, Lena Wysocki, Zhan Zhang, Paul H. M. van Loosdrecht, Lior Kornblum, James M. LeBeau, Ionela Lindfors-Vrejoiu, and Divine P. Kumah. Thickness and temperature dependence of the atomic-scale structure of SrRuO3 thin films. arXiv:2202.01652 (January 2022)

December 2021: Congratulations! Tongjie’s paper selected as Editor’s Pick in Journal of Vacuum Science and Technology A

  • T. Chen, K. Ahmadi-Majlan, Z. H. Lim, Z Zhang, J. H. Ngai, and D.P. Kumah. Effect of Buffer Termination on Intermixing and Conductivity in LaTiO3/SrTiO3 Heterostructures Integrated on Si(100). J. Vac. Sci. Technol. A 40, 013206 (2022); doi: 10.1116/6.0001464

September 2021: Congratulations to Aubrey Penn on successfully defending her Doctoral thesis!

September 2021: Two new papers posted to the ArXiV:

  • T. Chen, K. Ahmadi-Majlan, Z. H. Lim, Z Zhang, J. H. Ngai, and D.P. Kumah. Effect of Buffer Termination on Intermixing and Conductivity in LaTiO3/SrTiO3 Heterostructures Integrated on Si(100) arXiv:2109.08586 (September 2021)
  •   A. H. Al-Tawhid, J. Kanter, M. Hatefipour, D. L. Irving, D. P. Kumah, J. Shabani, K. Ahadi, Oxygen vacancy-induced anomalous Hall effect in a non-magnetic oxide . arXiv:2109.08073 ( September 2021)

July 2021: Congratulations to Tongjie Chen on successfully defending his Doctoral thesis!

May 2021: Collaborative paper with Ahadi group out in Applied Physics Letters.

  • A.H. Al-Tawhid, D.P. Kumah,  K. Ahadi, Two-dimensional electron systems and interfacial coupling in LaCrO3/KTaO3 heterostructures, Appl. Phys. Lett. 118, 192905 (2021)

November 2020: Kumah presents at the 2020 National Society of Black Physicists Annual Meeting

November 2020: Congratulations! Athby Al-Tawhid successfully defends his doctoral thesis!

October 2020: Our new paper led by Sanaz Koohfar and NC-State undergraduates Yasemin Ozbek and Hayden Bland is available on the arXiv.

S. Koohfar, Y. Ozbek, H. S. Bland, Z. Zhang, D. P. Kumah, Interface-driven magnetic anisotropy in relaxed La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures on MgO. arXiv:2010.07180 (October 2020) J. Applied Physics 129, 055301 (2021);

August 2020: Collaborative work with the Sun Group (NCSU), Wei group (UNC) and the Zhi-Gang group published in Physical Review Materials.

Eric Vetter, Ian VonWald, Shijia Yang, Liang Yan, Sanaz KoohfarDivine Kumah, Zhi-Gang Yu, Wei You, and Dali Sun, Tuning of spin-orbit coupling in metal-free conjugated polymers by structural conformation, Phys. Rev. Materials 4, 085603, August 2020

July 2020: Kumah gives a colloquium at the 2020 Les Houches Summer School of Physics. The presentation is available online at

February 2020: Sanaz’s paper demonstrating that ferromagnetism is robust in ultrathin LaSrMnO3 films under both tensile and compressive strain has been accepted for publication in Physical Review B (Phys. Rev. B 101, 064420 (2020)). A copy of the paper is available on the arxiv.

December 2019: Two papers accepted for publication. Former undergraduate group member Jacob Mauthe’s work on suspended crystalline oxides in collaboration with the Ngai group at University of Texas Arlington has been accepted for publication in the Journal of Vacuum Science and Technology.

  • Z. H. Lim, M. Chrysler, A. Kumar, J. P. Mauthe, D.P. Kumah, C. Richardson, J. Lebeau, J. Ngai. Suspended single-crystalline oxide structures on silicon through wet-etch techniques: effects of oxygen vacancies and dislocations on etch rates. Journal of Vacuum Science & Technology A 38, 013406 (2020) (published online 27 December 2019)

November 11 2019: Sanaz’s recent paper is available on the Arxiv

  • Sanaz Koohfar, Alexandru B. Georgescu, Ingrid Hallsteinsen, Ritesh Sachan, Manuel A. Roldan, Elke Arenholz, Divine P. Kumah, Effect of strain on magnetic and orbital ordering of LaSrCrO3/LaSrMnO3 heterostructures, arXiv:1911.03007. (November, 2019)

November 2019: Congratulations! Sanaz Koohfar successfully defends her doctoral thesis!

July 2019: Dr Kumah visits the University of Sao Paulo and the LNLS – Laboratório Nacional de Luz Síncrotron as part of the University Global Partnership Research Collaboration Fund program. A video of Dr Kumah’s colloquium at USP can be found here.