Works (61)

2023 journal article

The Role of Carbon Content: A Comparison of the Nickel Particle Size and Magnetic Property of Nickel/Polysiloxane‐Derived Silicon Oxycarbide

Advanced Engineering Materials.

By: N. Yang, X. Zhang, L. Reynolds, D. Kumah & C. Xu

Source: ORCID
Added: January 25, 2023

2022 journal article

Effect of buffer termination on intermixing and conductivity in LaTiO3/SrTiO3 heterostructures integrated on Si(100)

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A, 40(1).

By: T. Chen, K. Ahmadi-Majlan, Z. Lim, Z. Zhang, J. Ngai & D. Kumah

Sources: ORCID, Web Of Science
Added: December 4, 2021

2022 article

Oxygen Vacancy-Induced Anomalous Hall Effect in a Nominally Non-magnetic Oxide

Al-Tawhid, A. H., Kanter, J., Hatefipour, M., Irving, D. L., Kumah, D. P., Shabani, J., & Ahadi, K. (2022, September 24). JOURNAL OF ELECTRONIC MATERIALS, Vol. 9.

By: A. Al-Tawhid, J. Kanter, M. Hatefipour, D. Irving, D. Kumah, J. Shabani, K. Ahadi

Sources: Web Of Science, ORCID
Added: September 25, 2022

2022 journal article

Superconducting phase of TixOy thin films grown by molecular beam epitaxy

PHYSICAL REVIEW MATERIALS, 6(6).

By: Y. Ozbek n, C. Brooks, X. Zhang, A. Al-Tawhid, V. Stoica, Z. Zhang, D. Kumah

Sources: ORCID, Web Of Science
Added: June 28, 2022

2022 article

Superconductivity and Weak Anti-localization at KTaO3 (111) Interfaces

Al-Tawhid, A. H., Kanter, J., Hatefipour, M., Kumah, D. P., Shabani, J., & Ahadi, K. (2022, August 19). JOURNAL OF ELECTRONIC MATERIALS, Vol. 8.

By: A. Al-Tawhid, J. Kanter, M. Hatefipour, D. Kumah, J. Shabani & K. Ahadi

Sources: Web Of Science, ORCID
Added: August 24, 2022

2022 journal article

Thickness and temperature dependence of the atomic-scale structure of SrRuO3 thin films

APL MATERIALS, 10(5).

By: X. Zhang, A. Penn, L. Wysocki, Z. Zhang, P. Loosdrecht, L. Kornblum, J. LeBeau, I. Lindfors-Vrejoiu, D. Kumah

Sources: ORCID, Web Of Science
Added: May 12, 2022

2021 journal article

Interface-driven magnetic anisotropy in relaxed La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures on MgO

JOURNAL OF APPLIED PHYSICS, 129(5).

By: S. Koohfar, Y. Ozbek, H. Bland, Z. Zhang & D. Kumah

Sources: ORCID, Web Of Science
Added: February 2, 2021

2021 journal article

Two-dimensional electron systems and interfacial coupling in LaCrO3/KTaO3 heterostructures

APPLIED PHYSICS LETTERS, 118(19).

By: A. Al-Tawhid, D. Kumah & K. Ahadi

Sources: ORCID, Web Of Science
Added: May 13, 2021

2020 journal article

Correlating polar distortions and interfacial charge at the polar/non-polar LaCrO3/SrTiO3 (001) interface

AIP Advances.

By: A. Al-Tawhid n & D. Kumah

Source: ORCID
Added: May 3, 2020

2020 journal article

Effect of strain on magnetic and orbital ordering of LaSrCrO3/LaSrMnO3 heterostructures

Physical Review B, 101(6).

By: S. Koohfar n, A. Georgescu*, I. Hallsteinsen*, R. Sachan*, M. Roldan*, E. Arenholz*, D. Kumah

Source: ORCID
Added: February 22, 2020

2020 journal article

Exchange bias in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3/La0.7Sr0.3CrO3 heterostructures

AIP Advances, 10(1), 015001.

By: R. Olmos*, H. Iturriaga*, D. Blazer*, S. Koohfar n, K. Gandha*, I. Nlebedim*, D. Kumah, S. Singamaneni*

Source: ORCID
Added: January 3, 2020

2020 journal article

On the redistribution of charge in La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 multilayer thin films

AIP Advances.

By: A. Penn n, S. Koohfar n, D. Kumah & J. LeBeau*

Source: ORCID
Added: April 10, 2020

2020 journal article

Suspended single-crystalline oxide structures on silicon through wet-etch techniques: Effects of oxygen vacancies and dislocations on etch rates

Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, 38(1).

By: Z. Lim*, M. Chrysler*, A. Kumar*, J. Mauthe n, D. Kumah, C. Richardson*, J. Lebeau*, J. Ngai*

Source: ORCID
Added: April 22, 2020

2020 journal article

Tuning of spin-orbit coupling in metal-free conjugated polymers by structural conformation

Physical Review Materials.

By: E. Vetter n, I. VonWald*, S. Yang n, L. Yan*, S. Koohfar n, D. Kumah, Z. Yu*, W. You n, D. Sun

Source: ORCID
Added: August 29, 2020

2019 journal article

Confinement of magnetism in atomically thin La0.7Sr0.3CrO3/La0.7Sr0.3MnO3 heterostructures

Npj Quantum Materials, 4(1).

By: S. Koohfar, A. Georgescu*, A. Penn, J. LeBeau, E. Arenholz* & D. Kumah

Sources: Web Of Science, ORCID, Crossref
Added: June 17, 2019

2019 journal article

Epitaxial Oxides on Semiconductors: From Fundamentals to New Devices

Advanced Functional Materials, 7, 1901597.

By: D. Kumah, J. Ngai* & L. Kornblum*

Sources: Crossref, ORCID
Added: August 17, 2019

2019 journal article

Growth-temperature dependence of conductivity at the LaCrO3/SrTiO3 (001) interface

Journal of Vacuum Science & Technology A, 37(2), 021102.

By: A. Al-Tawhid n, J. Frick n, D. Dougherty & D. Kumah

Sources: Web Of Science, ORCID, Crossref
Added: March 25, 2019

2018 journal article

Interfacial structure of SrZrxTi1−xO3 films on Ge

Applied Physics Letters, 113(20), 201601.

By: T. Chen, K. Ahmadi-Majlan*, Z. Lim*, Z. Zhang*, J. Ngai*, A. Kemper n, D. Kumah

Sources: NC State University Libraries, ORCID, Crossref
Added: December 3, 2018

2018 journal article

Tuning metal-insulator behavior in LaTiO3/SrTiO3 heterostructures integrated directly on Si(100) through control of atomic layer thickness

Applied Physics Letters, 112(19), 193104.

By: K. Ahmadi-Majlan*, T. Chen n, Z. Lim*, P. Conlin*, R. Hensley*, M. Chrysler*, D. Su*, H. Chen* ...

Sources: ORCID, Crossref
Added: August 12, 2019

2017 journal article

Control of hidden ground-state order in NdNiO3 superlattices

Physical Review Materials, 1(2).

By: A. Disa*, A. Georgescu*, J. Hart*, D. Kumah, P. Shafer*, E. Arenholz*, D. Arena*, S. Ismail-Beigi* ...

Sources: Crossref, ORCID
Added: August 17, 2019

2017 journal article

Electrically coupling complex oxides to semiconductors: A route to novel material functionalities

Journal of Materials Research, 32(2), 249–259.

By: J. Ngai*, K. Ahmadi-Majlan*, J. Moghadam*, M. Chrysler*, D. Kumah, F. Walker*, C. Ahn*, T. Droubay* ...

Source: ORCID
Added: April 22, 2020

2017 journal article

Single Atomic Layer Ferroelectric on Silicon

Nano Letters, 18(1), 241–246.

By: M. Dogan, S. Fernandez-Peña*, L. Kornblum, Y. Jia, D. Kumah, J. Reiner, Z. Krivokapic*, A. Kolpak* ...

Sources: ORCID, Crossref
Added: August 17, 2019

2017 journal article

Structural distortions at polar manganite interfaces

Physical Review B, 96(2).

Sources: NC State University Libraries, ORCID
Added: August 6, 2018

2016 journal article

Electrically Coupling Multifunctional Oxides to Semiconductors: A Route to Novel Material Functionalities

MRS Advances, 1(4), 255–263.

By: J. Ngai*, K. Ahmadi-Majlan*, J. Moghadam*, M. Chrysler*, D. Kumah, C. Ahn*, F. Walker*, T. Droubay* ...

Sources: Crossref, ORCID
Added: August 17, 2019

2016 journal article

Engineered Unique Elastic Modes at a BaTiO3/(2×1)−Ge(001) Interface

Physical Review Letters, 116(10).

Sources: Crossref, ORCID
Added: August 17, 2019

2016 journal article

Role of double TiO2 layers at the interface of FeSe/SrTiO3 superconductors

Physical Review B, 93(18).

Sources: Crossref, ORCID
Added: August 17, 2019

2015 journal article

Orbital Engineering in Symmetry-Breaking Polar Heterostructures

Physical Review Letters, 114(2).

Sources: Crossref, ORCID
Added: August 17, 2019

2015 journal article

Oxide 2D electron gases as a route for high carrier densities on (001) Si

Applied Physics Letters, 106(20), 201602.

Source: ORCID
Added: August 12, 2019

2014 journal article

A high density two-dimensional electron gas in an oxide heterostructure on Si (001)

APL Materials, 2(11), 116109.

Source: ORCID
Added: August 12, 2019

2014 conference paper

A silicon integrated BaTiO3 electro-optic modulator

Conference on Lasers and Electro-Optics Europe - Technical Digest, 2014-January. http://www.scopus.com/inward/record.url?eid=2-s2.0-84944698664&partnerID=MN8TOARS

By: C. Xiong, W. Pernice, J. Ngai, J. Reiner, D. Kumah, F. Walker, C. Ahn, H. Tang

Source: ORCID
Added: April 22, 2020

2014 journal article

Active Silicon Integrated Nanophotonics: Ferroelectric BaTiO3 Devices

Nano Letters, 14(3), 1419–1425.

By: C. Xiong*, W. Pernice*, J. Ngai*, J. Reiner*, D. Kumah, F. Walker*, C. Ahn*, H. Tang*

Sources: Crossref, ORCID
Added: August 17, 2019

2014 journal article

Effect of Surface Termination on the Electronic Properties of LaNiO3 Films

Physical Review Applied, 2(5), 054004.

By: D. Kumah, A. Malashevich*, A. Disa*, D. Arena*, F. Walker*, S. Ismail-Beigi*, C. Ahn*

Sources: Crossref, ORCID
Added: August 17, 2019

2014 journal article

Hysteretic electrical transport in BaTiO3/Ba1−xSrxTiO3/Ge heterostructures

Applied Physics Letters, 104(6), 062905.

By: J. Ngai*, D. Kumah, C. Ahn* & F. Walker*

Sources: Crossref, ORCID
Added: August 17, 2019

2014 journal article

Tuning the Structure of Nickelates to Achieve Two-Dimensional Electron Conduction

Advanced Materials, 26(12), 1935–1940.

By: D. Kumah, A. Disa*, J. Ngai*, H. Chen*, A. Malashevich*, J. Reiner*, S. Ismail-Beigi*, F. Walker*, C. Ahn*

Sources: Crossref, ORCID
Added: August 17, 2019

2013 journal article

La-doped BaTiO3 heterostructures: Compensating the polarization discontinuity

APL Materials, 1(6), 062107.

By: D. Kumah, Y. Yacoby*, S. Pauli*, P. Willmott* & R. Clarke*

Sources: Crossref, ORCID
Added: August 17, 2019

2013 journal article

Modifying the Electronic Orbitals of Nickelate Heterostructures via Structural Distortions

Physical Review Letters, 110(18).

Source: ORCID
Added: August 12, 2019

2013 journal article

Phase diagram of compressively strained nickelate thin films

APL Materials, 1(3), 032110.

Sources: Crossref, ORCID
Added: August 17, 2019

2013 journal article

Role of epitaxial strain on the magnetic structure of Fe-doped CoFe2O4

Journal of Magnetism and Magnetic Materials, 345, 180–189.

By: J. Moyer*, D. Kumah, C. Vaz*, D. Arena* & V. Henrich*

Source: ORCID
Added: August 12, 2019

2012 journal article

Enhanced magnetic moment in ultrathin Fe-doped CoFe2O4 films

Physical Review B, 86(17).

By: J. Moyer*, C. Vaz*, D. Kumah, D. Arena* & V. Henrich*

Source: ORCID
Added: August 12, 2019

2012 journal article

Epitaxial strain-induced changes in the cation distribution and resistivity of Fe-doped CoFe2O4

Applied Physics Letters, 101(2).

By: J. Moyer, D. Kumah, C. Vaz, D. Arena & V. Henrich

Source: ORCID
Added: August 12, 2019

2012 journal article

Piezoelectric force microscopy of crystalline oxide-semiconductor heterostructures

Applied Physics Letters, 101(10).

By: M. Marshall, D. Kumah, J. Reiner, A. Baddorf*, C. Ahn* & F. Walker*

Source: ORCID
Added: August 12, 2019

2011 journal article

Correlating structure, strain, and morphology of self-assembled InAs quantum dots on GaAs

Applied Physics Letters, 98(2).

By: D. Kumah, J. Wu*, N. Husseini*, V. Dasika*, R. Goldman, Y. Yacoby*, R. Clarke

Source: ORCID
Added: August 12, 2019

2011 journal article

Magnetic structure of Fe-doped CoFe(2)O(4) probed by x-ray magnetic spectroscopies

Physical Review B, 84(5).

By: J. Moyer*, C. Vaz*, D. Arena*, D. Kumah, E. Negusse* & V. Henrich*

Source: ORCID
Added: August 12, 2019

2011 journal article

Structure of droplet-epitaxy-grown InAs/GaAs quantum dots

Applied Physics Letters, 98(24).

By: E. Cohen*, S. Yochelis*, O. Westreich*, S. Shusterman*, D. Kumah, R. Clarke, Y. Yacoby*, Y. Paltiel*

Source: ORCID
Added: August 12, 2019

2011 journal article

Surface X-Ray Diffraction Results on the III-V Droplet Heteroepitaxy Growth Process for Quantum Dots: Recent Understanding and Open Questions

Sensors, 11(11), 10624–10637.

By: E. Cohen*, N. Elfassy*, G. Koplovitz*, S. Yochelis*, S. Shusterman*, D. Kumah, Y. Yacoby*, R. Clarke*, Y. Paltiel*

Source: ORCID
Added: August 12, 2019

2010 journal article

The atomic structure and polarization of strained SrTiO(3)/Si

Applied Physics Letters, 97(25).

By: D. Kumah, J. Reiner, Y. Segal, A. Kolpak, Z. Zhang, D. Su, Y. Zhu, M. Sawicki ...

Source: ORCID
Added: August 12, 2019

2009 journal article

Atomic-scale mapping of quantum dots formed by droplet epitaxy

Nature Nanotechnology, 4(12), 835–838.

By: D. Kumah, S. Shusterman*, Y. Paltiel*, Y. Yacoby* & R. Clarke*

Source: ORCID
Added: August 12, 2019

2009 book

Surface x-ray diffraction of complex metal oxide surfaces and interfaces - a new era

In Synchrotron Radiation in Materials Science (Vol. 1092, pp. 9–12).

By: ResearcherID

Source: ORCID
Added: August 12, 2019

2009 conference paper

Surface x-ray diffraction of complex metal oxide surfaces and interfaces - a new era

AIP Conference Proceedings, 1092, 9–12.

By: C. Schlepütz*, P. Willmott*, S. Pauli*, R. Herger*, D. Martoccia*, M. Björck*, D. Kumah, R. Clarke*, Y. Yacoby*

Source: ORCID
Added: April 22, 2020

2008 journal article

In situ imaging of high cycle fatigue crack growth in single crystal nickel-base superalloys by synchrotron X-radiation

Journal of Engineering Materials and Technology-Transactions of the Asme, 130(2), 0210081–0210086.

By: L. Liu*, N. Husseini*, C. Torbet*, D. Kumah, R. Clarke*, T. Pollock*, J. Jones*

Source: ORCID
Added: August 12, 2019

2008 journal article

Mapping single-crystal dendritic microstructure and defects in nickel-base superalloys with synchrotron radiation

Acta Materialia, 56(17), 4715–4723.

By: N. Husseini*, D. Kumah, J. Yi*, C. Torbet*, D. Arms*, E. Dufresne*, T. Pollock*, J. Jones*, R. Clarke*

Source: ORCID
Added: August 12, 2019

2008 journal article

Resonant coherent Bragg rod analysis of strained epitaxial heterostructures

Applied Physics Letters, 93(8).

By: ResearcherID

Source: ORCID
Added: August 12, 2019

2008 journal article

Strain and composition mapping of epitaxial nanostructures

Applied Physics Letters, 92(15).

By: C. Cionca*, A. Riposan*, D. Kumah, N. Husseini*, D. Walko*, Y. Yacoby*, J. Millunchick*, R. Clarke

Source: ORCID
Added: August 12, 2019

2008 journal article

Structure determination of monolayer-by-monolayer grown La1-xSrxMnO3 thin films and the onset of magnetoresistance

Physical Review B, 77(8).

By: ResearcherID

Source: ORCID
Added: August 12, 2019

2007 journal article

Optimizing the planar structure of (111) Au/Co/Au trilayers

Journal of Physics D-Applied Physics, 40(9), 2699–2704.

Source: ORCID
Added: August 12, 2019

2007 journal article

Spatial coherence properties of a compact and ultrafast laser-produced plasma keV x-ray source

Applied Physics Letters, 90(1).

By: D. Boschetto*, G. Mourou*, A. Rousse*, A. Mordovanakis*, B. Hou*, J. Nees*, D. Kumah, R. Clarke*

Source: ORCID
Added: August 12, 2019

2007 journal article

Structural basis for the conducting interface between LaAlO3 and SrTiO3

Physical Review Letters, 99(15).

By: P. Willmott*, S. Pauli*, R. Herger*, C. Schlepütz*, D. Martoccia*, B. Patterson*, B. Delley*, R. Clarke* ...

Source: ORCID
Added: August 12, 2019

2007 conference paper

Surface plasmon resonance effects in the Magneto Optical activity of noble metal-ferro magnet ultrathin films

Conference on Lasers and Electro-Optics Europe - Technical Digest.

Source: ORCID
Added: April 22, 2020

2007 conference paper

Surface plasmon resonance effects in the Magneto Optical activity of noble metal-ferromagnet ultrathin films

Optics InfoBase Conference Papers. http://www.scopus.com/inward/record.url?eid=2-s2.0-84899093598&partnerID=MN8TOARS

By: J. Gonzalez-Diaz, A. Garcia-Martin, G. Armelles, J. Garcia-Martin, C. Clavero, A. Cebollada, R. Clarke, D. Kumah, R. Lukaszew, J. Skuza

Source: ORCID
Added: April 22, 2020

2007 journal article

Surface-magnetoplasmon nonreciprocity effects in noble-metal/ferromagnetic heterostructures

Physical Review B, 76(15).

Source: ORCID
Added: August 12, 2019

2006 conference paper

Demonstration of spatial coherence with a compact and ultrafast x-ray source

Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006.

By: D. Boschetto*, A. Mordovanakis*, J. Nees*, B. Hou*, D. Kumah, R. Clarke*, G. Mourou*, A. Rousse*

Source: ORCID
Added: April 22, 2020

Employment

2021 - present

North Carolina State University Raleigh, NC, US
Associate Professor Physics

2015 - 2021

North Carolina State University Raleigh, NC, US
Assistant Professor Physics