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Articles on arXiv

Selected Publications

  1. Sina Najmaei, Chinedu E.Ekuma, Adam A.Wilson, Asher C.Leff, and Madan Dubey, "Dynamically reconfigurable electronic and phononic properties in intercalated HfS2", Materials Today 39, 110 (2020)doi: 10.1016/j.mattod.2020.04.030
  2. Kingsley O Egbo, Chinedu E Ekuma, Chao Ping Liu, Kin Man Yu, "Efficient p-type doping of sputter-deposited NiO thin films with Li, Ag and Cu acceptors", Phys. Rev. Materials 4, 104603 (2020). doi: 10.1103/PhysRevMaterials.4.104603
  3. Kingsley O Egbo, Chinedu E Ekuma, Chao Ping Liu, Kin Man Yu, "Vacancy defects induced changes in the electronic and optical properties of NiO studied by spectroscopic ellipsometry and first-principles calculations", Journal of Applied Physis 128, 135705 (2020). doi: 10.1063/5.0021650
  4. C.E. Ekuma and Z.-L Liu, "Mechanical properties and hardness of boron pnicogens BX (X= N, P, As)", Materialia, 14, 100904 (2020). doi: 10.1016/j.mtla.2020.100904 
  5. T.C. Chibueze, C.E. Ekuma, A.T. Raji, F.I. Ezema, C.M.I. Okoye, "Tetragonal and uniaxial strains in pristine and doped half-Heusler AuMnSn alloy", Journal of Alloys and Compounds, 848, 156186 (2020). doi: 10.1016/j.jallcom.2020.156186  
  6. C.E. Ekuma and S. Najmaei, "Graphene/ZnO van der Waals stacks for thermal management",  ACS Appl. Nano Mater. 3(7), 7136 (2020). doi: 10.1021/acsanm.0c01465.
  7. K. Aziz and C.E. Ekuma, "Electronic and vibrational spectrocopy of miscible MgO-ZnO ternary alloys", Journal of Applied Physics, 127, 075706 (2020). doi: 10.1063/1.5141363
  8. T.C. Chibueze, C.E. Ekuma, A.T. Raji, D.P Rai, C.M.I Okoye, "Ferromagnetic half-metallicity in half-Heusler AuMnSn: Te Alloy", Materials Research Express, 7, 076519 (2020). doi: 10.1088/2053-1591/ab88ff

  9. Katherine M Price, Sina Najmaei, Chinedu E Ekuma, Robert A Burke, Madan Dubey, Aaron D Franklin, "Plasma-Enhanced Atomic Layer Deposition of HfO2 on Monolayer, Bilayer, and Trilayer MoS2 for the Integration of High-κ Dielectrics in Two-Dimensional Devices" ACS Applied Nano Materials 2(7), 4085 (2019). doi: 10.1021/acsanm.9b00505
  10. C. E. Ekuma, S. Najmaei, and M. Dubey, "Surface passivated and encapsulated ZnO atomic layer by high-κ ultrathin MgO layer" Nanoscale 11, 12502 (2019). doi: 10.1039/C9NR03288F
  11. C. E. Ekuma, S. Najmaei, and M. Dubey, "Electronic and vibrational properties of van der Waals heterostructures of vertically stacked few-layer atomically thin MoS2 and BP" Materials Today Communications 19, 383 (2019). doi: 10.1016/j.mtcomm.2019.03.005
  12. C. E. Ekuma, "Optical absorption in monolayer SnO2" Phys. Rev. B 99, 075421 (2019). doi: 10.1103/PhysRevB99.075421
  13. C. E. Ekuma, "Fingerprints of native defects in monolayer PbTe" Nanoscale Advances 1, 513 (2019). doi:  10.1039/C8NA00125A
  14. Kalisadhan Mukherjee, Chinedu E Ekuma, Yangyang Zhao, Abhishek Maikap, Sina Najmaei, Mona E Zaghloul, "Discrimination of 1‐ and 2‐Propanol by Using the Transient Current Change of a Semiconducting ZnFe2O4 Chemiresistor" ChemPlusChem Communications 84, 387 (2019). doi: 10.1002/cplu.201900036
  15. C. E. Ekuma, "Observation of Novel Multifunctionalities in Monolayer CdO " Advanced Theory and Simulations 1, 1800107 (2018). doi: 10.1002/adts.201800107
  16. C. E. Ekuma and D. Gunlycke, "Optical absorption in monolayer molybdenum disulfide" Phys. Rev. B 97, 201414(R)  (2018). doi: 10.1103/PhysRevB.97.201414
  17. C. E. Ekuma, "Effects of vacancy defects on the electronic and optical properties of monolayer PbSe", J. Phys. Chem. Lett.  9(13) 3680 (2018). doi: 10.1021/acs.jpclett.8b01585
  18. C. E. Ekuma, "Two-particle excitations under coexisting electron interaction and disorder", Phys. Rev. B. 98, 085129 (2018). doi: 10.1103/PhysRevB.98.085129
  19.  C. E. Ekuma, V. Dobrosavljevic, and D. Gunlycke, "First-principles-based method for electron localization: Application to monolayer hexagonal boron nitride", Phys. Rev. Lett. 118, 106404 (2017). doi: 10.1103/PhysRevLett.118.106404
  20. N.Q. Lee, C. E. Ekuma, B. Dunlap, and D. Gunlycke, "First-principles calculations of sarin adsorption on anatase surface", J. Phys. Chem. C 122, 2832 (2018). doi: 10.1021/acs.jpcc.7b11509
  21. C. E. Ekuma et al.  "Electronic structure and X-ray spectroscopy of Cu2MnAl1-xGax", Journal of Applied Physics 123,  161509 (2018). doi: 10.1063/1.4996650
  22. C.E. Ekuma et al. "Electronic, optical, and thermoelectric properties of Fe2+xV1−xAl", AIP Advances 7, 045118 (2017). doi: 10.1063/1.4982671
  23. C. E. Ekuma, S.-X. Yang, H. Terletska, K.-M. Tam, N. S. Vidhyadhiraja, J. Moreno, and M. Jarrell, "Metal-Insulator-Transition in a Weakly interacting Disordered Electron System", Phys. Rev. B 92, 201114(R) 2015. doi: 10.1103/PhysRevB.92.201114
  24. Y. Zhang, H. Terletska, C. Moore, C. E. Ekuma, K.-M. Tam, T. Berlijn, W. Ku, J. Moreno, M. Jarrell, "Study of multiband disordered systems using the typical medium dynamical cluster approximation", Phys. Rev. B 92, 205111 (2015). doi: 10.1103/PhysRevB.92.205111 
  25. C. E. Ekuma, H. Terletska, C. Moore, K.-M. Tam, N. S. Vidhyadhiraja, J. Moreno, and M. Jarrell, "Finite Cluster Typical Medium Theory for Disordered Electronic Systems", Phys. Rev. B  92, 014209 (2015). doi: 10.1103/PhysRevB.92.014209
  26. J. H. Mendez, C. E. Ekuma, Y. Wu, B. W. Fulfer,  J. C. Prestigiacomo, W. A. Shelton, M. Jarrell, J. Moreno, D. P. Young, P. W. Adams,  A. Karki, R. Jin, Julia Y. Chan, J. F. DiTusa, "Competing magnetic states, disorder, and the magnetic character of Fe3Ga4", Phys. Rev. B 91, 144409 (2015). doi: 10.1103/PhysRevB.91.144409
  27. H Terletska, C. E. Ekuma, C. Moore, K. -M Tam, Z-Y Meng, J Moreno, M Jarrell, "Study of off-diagonal disorder using the typical medium dynamical cluster approximation", Phys. Rev. B 90, 094208 (2014). doi: 10.1103/PhysRevB.90.094208
  28. C. E. Ekuma, H Terletska, K-M Tam, Z-Y Meng, J Moreno, M Jarrell, "Typical medium dynamical cluster approximation for the study of Anderson localization in three dimensions", Phys. Rev. B 89, 081107(R) (2014). doi: 10.1103/PhysRevB.89.081107
  29. C. E. Ekuma, V. I. Anisimov, J. Moreno, and M. Jarrell, "Electronic Structure and Spectra of CuO", The European Physical Journal B 87, 23 (2014). doi: 10.1140/epjb/e2013-40949-5
  30. C. E. Ekuma, J. Moreno, and M. Jarrell, "Electronic, transport, optical, and structural properties of rocksalt CdO", J. Appl. Phys. 114, 153705 (2013). doi: 10.1063/1.4825312
  31. C. E. Ekuma, H. Terletska, Z.-Y. Meng, J. Moreno, M. Jarrell, S. Mahmoudian, and V. Dobrosavljevic, "Effective Cluster Typical Medium Theory for Diagonal Anderson Disorder Model in One-and Two-Dimensions", J. Phys.: Condens. Matter 26, 274209 (2014). doi: 10.1088/0953-8984/26/27/274209
  32. C. E. Ekuma, Chia-Hui Lin, J. Moreno, W. Ku, and M. Jarrell, "First-principles Wannier function analysis of the electronic structure of PdTe: weaker magnetism and superconductivity", J. Phys.: Condens. Matter 25, 405601 (2013). doi: 10.1088/0953-8984/25/40/405601
  33. C. E. Ekuma, D. Bagayoko., Moreno, and M. Jarrell, "Re-examining the Electronic Structure of Ge: A First-Principle Study", Phys. Lett. A 317 (34-37), 2172-2176 (2013). doi:10.1016/j.physleta.2013.05.043
  34. L. Franklin, C. E. Ekuma, G. L. Zhao, and D. Bagayoko, "Density functional theory description of electronic properties of wurtzite zinc oxide", Journal of Physics and Chemistry of Solids 74 (5), 729-736 (2013). doi: 10.1016/j.jpcs.2013.01.013
  35. J. Li, C. E. Ekuma, I. Vekhter, M. Jarrell, J. Moreno, S. Stadler, A. Karki, and R. Jin, "Physical Properties of Ba2Mn2Sb2O Single Crystals", Phys. Rev. B 86, 195142 (2012). doi: 10.1103/PhysRevB.86.195142
  36. C. E. Ekuma, J. Moreno, M. Jarrell, and D. Bagayoko, "Electronic, Structural, and Elastic Properties of Metal Nitrides XN (X = Sc, YN): A First-Principle Study", AIP Advances 2, 032163 (2012). doi: 10.1063/1.4751260
  37. C. E. Ekuma, M. Jarrell, J. Moreno, and D. Bagayoko, "First Principle Electronic, Structural, Elastic, and Optical Properties of Strontium Titanate", AIP Advances 2, 012189 (2012). doi: 10.1063/1.3700433
  38. C. E. Ekuma, David J. Singh, J. Moreno, and M. Jarrell, "Optical Properties of PbTe and PbSe", Phys. Rev. B 85, 085205 (2012). doi: 10.1103/PhysRevB.85.085205
  39. C. E. Ekuma and D. Bagayoko, "Ab-initio Electronic and Structural Properties of Rutile Titanium Dioxide", Jpn. J. Appl. Phys. 50, 101103 (2011). doi: 10.1143/JJAP.50.101103
  40. Y. Zhen, S. Hall, T. Brown, C. E. Ekuma, Z. Bell, Z. W. Sun, and J. T. Wang, "Synthesis and Characterization of (1-x)(Na_0.5Bi_0.5)TiO_3-xAl_6Bi_2O_12 Solid Solution", Ferroelectrics 413 (1), 192-205 (2011). doi: 10.1063/1.2967335
  41. C. E. Ekuma, L. Franklin, J. T. Wang, G. L. Zhao, and D. Bagayoko, "Local density approximation description of electronic properties of wurtzite cadmium sulfide (w-CdS)", Can. J. Phys. 89 (3), 319-324 (2011). doi: 10.1139/P11-023
  42. C. E. Ekuma, L. Franklin, J. T. Wang, G. L. Zhao, and D. Bagayoko, "Ab-initio local density approximation description of the electronic properties of zinc blende cadmium sulde (zb-CdS)", Physica B 406 (8), 1477 (2011). doi: 10.1016/j.physb.2011.01.051