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List of Publications

Keun Hyuk "Ken" Ahn

Highlights

Total number of citations: 1200 (updated on 10/24/2011)

H-index: 15 (15 papers are cited over 15 times)

2 papers, including one in Nature in 2004, are cited over 200 times.

1 paper is cited between 100-200 times

Publications

Publications 17-27, 11 papers, are published during the appointment at NJIT, 2007-2011.

Publication 14 in Nature was featured in News and Views article in Nature Materials and in Los Alamos News Release.

Published at NJIT

27. Measurements and ab initio molecular dynamics simulations of the high temperature ferroelectric transition in hexagonal RMnO₃

T. A. Tyson, T. Wu, H. Y. Chen, J. Bai, K. H. Ahn, K. I. Pandya, S. B. Kim, and S.- W. Cheong, J. Appl. Phys. 110, 084116 (2011).

26. High-pressure structural stability of multiferroic hexagonal RMnO₃ (R=Y, Ho, Lu)

P. Gao, Z. Chen, T. A. Tyson, T. Wu, K. H. Ahn, Z. Liu, R. Tappero, S. B. Kim, and S.- W. Cheong, Phys. Rev. B 83, 224113 (2011).

25. Adjusted oscillator strength matching for hybrid magnetic and electric excitations in Dy₃Fe₅O₁₂ garnet

P. D. Rogers, Y. J. Choi, E. C. Standard, T. D. Kang, K. H. Ahn, A. Dubroka, P. Marsik, Ch. Wang, C. Bernhard, S. Park, S.-W. Cheong, M. Kotelyanskii, and A. A. Sirenko, Phys. Rev. B 83, 174407 (2011).

[Selected for Editors' Suggestions]

24. Coupling between magnon and ligand-field excitations in magnetoelectric Tb₃Fe₅O₁₂ garnet

T. D. Kang, E. Standard, K. H. Ahn, A. A. Sirenko, G. L. Carr, S. Park, Y. J. Choi, M. Ramazanoglu, V. Kiryukhin, S-W. Cheong, Phys. Rev. B 82, 014414 (2010).

23. Origin of the non-linear pressure effects in perovskite manganites: Buckling of Mn-O-Mn bonds and Jahn-Teller distortion of the MnO₆ octahedra induced by pressure

Z. Chen, T. A. Tyson, K. H. Ahn, Z. Zhong, and J. Hu, J. of Magnetism and Magnetic Materials 322, 3049 (2010). (Cited once)

22. Local spin-coupled distortions in multiferroic hexagonal HoMnO₃

T. A. Tyson, T. Wu, K. H. Ahn, S.-B. Kim, and S.-W. Cheong, Phys. Rev. B 81, 054101 (2010). (Cited 5 times)

21. Dynamics and spectral weights of shake-up valence excitations in transition metal K-edge resonant inelastic x-ray scattering

K. H. Ahn, A. J. Fedro, and M. van Veenendaal, Phys. Rev. B 79, 045103 (2009).

20. Infrared-active excitations related to Ho3+ ligand-field splitting at the commensurate-incommensurate magnetic phase transition in HoMn₂O₅

A. A. Sirenko, S. M. O’Malley, K. H. Ahn, S. Park, G. L. Carr, and S-W. Cheong, Phys. Rev. B 78, 174405 (2008). (Cited once)

19. Epitaxial checkerboard arrangement of nanorods in ZnMnGaO₄ films studied by x-ray diffraction

S. M. O'Malley, P. L. Bonanno, K. H. Ahn, A. A. Sirenko, A. Kazimirov, S. Park, and S-W. Cheong, Phys. Rev. B 78, 165424 (2008). (Cited once)

18. Nematic domains and resistivity in an itinerant metamagnet coupled to phonons

H. Doh, Y. B. Kim, and K. H. Ahn, Phys. Rev. Lett. 98, 126407 (2007). (Cited 10 times)

17. Observation of strain and temperature induced changes in the band structure of thin La_0.8MaO_3-d films

T. A. Tyson, Q. Qing, M. A. DeLeon, C. Dubourdieu, L. Fratila, Y. Q. Cai, and K. H. Ahn, Appl. Phys. Lett. 90, 101915 (2007)

Published before NJIT

16. Electronic properties of structural twin and antiphase boundaries in materials with strong electron-lattice couplings

K. H. Ahn, T. Lookman, A. Saxena and A. R. Bishop, Phys. Rev. B 71, 212102 (2005). (Cited 10 times)

15. Coherent optical and acoustic phonon generation correlated to charge ordering phase transition in La_1-xCa_xMnO₃

D. Lim, V. K. Thorsmølle, R. D. Averitt, Q. X. Jia, K. H. Ahn, M. J. Graf , S. A. Trugman and A. J. Taylor, Phys. Rev. B 71, 134403 (2005). (Cited 13 times)

14. Strain-induced metal-insulator phase coexistence in perovskite manganites

K. H. Ahn, T. Lookman and A. R. Bishop, Nature 428, 401 (2004). (Cited 239 times)

[Featured in “News & Views” article, "The third way, N. Mathur and P. Littlewood, Nature Materials 3, 207 (2004)", and in the Los Alamos News Bulletin. Invited for 2005 APS March Meeting and 2005 Magnetism and Magentic Materials Conference.]

13. Ultrafast quasiparticle relaxation dynamics in normal metals and heavy fermion materials

K. H. Ahn, M. J. Graf, S. A. Trugman, J. Demsar, R. D. Averitt, J. L. Sarrao and A. J. Taylor, Phys. Rev. B 69, 045114 (2004). (Cited 14 times)

[Included in Virtual Journal of Ultrafast Science 3, Issue 2 (2004)]

12. Strain selection of charge and orbital ordering patterns in half-doped manganites

M. J. Calderón, A. J. Millis and K. H. Ahn, Phys. Rev. B 68 - Rapid Comm., 100401 (2003).(Cited 40 times)

11. Atomic scale lattice distortions and domain wall profiles

K. H. Ahn, T. Lookman, A. Saxena and A. R. Bishop, Phys. Rev. B 68, 092101 (2003). (Cited 11 times)

10. Elasticity-driven nanoscale electronic structure in superconductors

J.-X. Zhu, K. H. Ahn, Z. Nussinov, T. Lookman, A. V. Balatsky and A. R. Bishop, Phys. Rev. Lett. 91, 057004 (2003).(Cited 18 times)

9. Quasiparticle relaxation dynamics in heavy fermion compounds

J. Demsar, R. D. Averitt, K. H. Ahn, M. J. Graf, S. A. Trugman, V. V. Kabanov, J. L. Sarrao and A. J. Taylor, Phys. Rev. Lett. 91, 027401 (2003).(Cited 24 times)

[Included in Virtual Journal of Ultrafast Science 2, Issue 8 (2003)]

8. Superconductivity in magnetically ordered CeTe_1.82

M. H. Jung, A. Alsmadi, H. C. Kim, Y. Bang, K. H. Ahn, K. Umeo, A. H. Lacerda, H. Nakotte, H. C. Ri and T. Takabatake, Phys. Rev. B 67, 212504 (2003). (Cited 13 times)

7. Ground state properties of ferromagnetic metal/conjugated polymer interfaces

S. J. Xie, K. H. Ahn, D. L. Smith, A. R. Bishop and A. Saxena, Phys. Rev. B 67, 125202 (2003). (Cited 51 times)

6. Effects of the uniaxial strain in LaMnO₃

K. H. Ahn and A. J. Millis, Phys. Rev. B 64, 115103 (2001).(Cited 37 times)

5. Effects of magnetic ordering on the anisotropy and temperature dependence of the optical conductivity in LaMnO₃: a tight binding approach

K. H. Ahn and A. J. Millis, Phys. Rev. B 61, 13545 (2000). (Cited 48 times)

4. Optical conductivity of manganites: Crossover from Jahn-Teller small polaron to coherent transport in the ferromagnetic state

M. Quijada, J. Černe, J. R. Simpson, H. D. Drew, K. H. Ahn, A. J. Millis, R. Shreekala, R. Ramesh, M. Rajeswari and T. Venkatesan, Phys. Rev. B 58, 16093 (1998). (Cited 135 times)

3. Interplay of charge and orbital ordering in manganese perovskites

K. H. Ahn and A. J. Millis, Phys. Rev. B 58, 3697 (1998). (Cited 48 times)

2. Magnetic properties and colossal magnetoresistance of La(Ca)MnO₃ materials doped with Fe

K. H. Ahn, X. W. Wu, K. Liu and C. L. Chien, Phys. Rev. B 54, 15299 (1996). (Cited 222 times)

1. Charge ordering and magnetoresistance in Nd_1-xCa_xMnO₃ due to reduced double exchange

K. Liu, X. W. Wu, K. H. Ahn, T. Sulchek, C. L. Chien and J. Q. Xiao, Phys. Rev. B 54, 3007 (1996). (Cited 88 times)

Papers Submitted

1. Symmetry-based atomic scale description of lattice dynamics and its applications for phonon mode analysis

Jichan Moon, Tsezar F. Seman, and K. H. Ahn (arXiv:0707.1921)

Conference Proceedings, Magazine Articles and Book Chapters

Published at NJIT

10. Reverse resistance switching in polycrystalline Nb₂O₅ films

Y. Jo, H. Sim, H. Hwang, K. Ahn, M.-H. Jung, Thin Solid Films 518, 5676 (2010).(Cited once)

Published before NJIT

9. Self-Assembled nano-checkerboard thin films studied by reciprocal space mapping at CHESS

S. M. O'Malley, P. L. Bonanno, K. H. Ahn, A. A. Sirenko, A. Kazimirov, M. Tanimura, T. Asada, S. Park, Y. Horibe, and S.-W. Cheong, CHESS News Magazine 2009, 48 (2009).

8. Model for strain-induced metal-insulator phase coexistence in colossal magnetoresistive perovskite manganites (Invited)

K. H. Ahn, T. Lookman, and A. R. Bishop, J. Appl. Phys. 99, 08A703 (2006). (Cited 4 times)

7. Basic properties of spin injection and transport in ferromagnetic/polymer systems

S. J. Xie, J. F. Ren, J. Y. Fu, K. H. Ahn, D. L. Smith, A. R. Bishop and A. Saxena, a book chapter in Progress in Ferromagnetism Research, Nova Science Publisher (2005).

6. Atomic scale elastic textures coupled to electrons in superconductors

K. H. Ahn, J.-X. Zhu, Z. Nussinov, T. Lookman, A. Saxena, A. V. Balatsky and A. R. Bishop, J. Superconductivity 17, 7 (2004).(Cited twice)

5. Effects of in-plane strain on magnetism in LaMnO₃ thin films

K. H. Ahn and A. J. Millis, Int. J. of Modern Physics 16, 3281 (2002). (Cited twice)

4. Effects of in-plane strain on orbital ordering and magnetism in LaMnO₃ thin film

K. H. Ahn and A. J. Millis, Physica B 312-313, 766 (2002). (Cited 3 times)

3. Effects of in-plane strain on magnetism in LaMnO₃ thin films

K. H. Ahn and A. J. Millis, Proceedings of Physical Phenomena at High Magnetic Fields – IV, 389 (2001).

2. Optical and magnetic property of LaMnO₃

K. H. Ahn and A. J. Millis, J. Appl. Phys. 87, 5013 (2000). (Cited 3 times)

1. Effects of Fe doping in the colossal magnetoresistive La_1-xCa_xMnO₃

K. H. Ahn, X. W. Wu, K. Liu and C. L. Chien, J. Appl. Phys. 81, 5505 (1997). (Cited 58 times)