publications

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List of Publications

Keun Hyuk "Ken" Ahn

Highlights

Total number of citations: 2075 (updated in June 2021)

H-index: 20 (20 papers are cited 20 times or more)

1 paper, published in Nature in 2004, has been cited over 500 times.

1 paper has been cited between 300-400 times.

1 paper has been cited between 200-300 times.

2 papers have been cited between 100-200 times

Publications (Ahn and his students' names are underlined.)

Papers Submitted or Accepted

To be posted.

Published at NJIT

39. Observation of Majorana-like bound states in metamaterial-based Kitaev chain analogs

K. Qian, D. J. Apigo, K. Padavić, K. H. Ahn, S. Vishveshwara, and C. Prodan, Phys. Rev. Res. 5 - Letter, L012012 (2023).

(Supplemental material: Fig1g_video, Fig1i_video, Fig2a_video, Fig2b_video, Fig2c_video)

38. Observation of flat frequency bands at open edges and antiphase boundary seams in topological mechanical metamaterials

K. Qian, L. Zhu, K. H. Ahn, and C. Prodan, Phys. Rev. Lett. 125, 225501 (2020).

(Supplemental material: Text, Fig4a_video, Fig4b_video, Fig4c_video, Fig4d_video, Fig5b_video)

37. Flat energy bands within antiphase and twin boundaries and at open edges in topological materials

L. Zhu, E. Prodan, and K. H. Ahn, Phys. Rev. B 99 – Rapid Commun., 041117(R) (2019).

(Supplemental material)

36. Photoinduced nonequilibrium dynamics in charge ordered materials

L. Zhu, T. F. Seman, M. van Veenendaal, and K. H. Ahn, J. Appl. Phys. 123, 115112 (2018).

(Supplemental material: Video 1, Video 2)

35. Pressure dependent structural changes and predicted electrical polarization in perovskite RMnO₃

T. Wu, H. Chen, P. Gao, T. Yu, Z. Chen, Z. Liu, K. H. Ahn, X. Wang, S.-W. Cheong, T. A. Tyson, J. Phys. Condens. Matter 28, 056005 (2016).

34. Absence of significant structural changes near the magnetic ordering temperature in small-ion rare earth perovskite RMnO₃

T. Yu, T. A. Tyson, H. Y. Chen, A. M. M. Abeykoon, Y.-S. Chen, K. H. Ahn, J. Phys. Condens. Matter 26, 495402 (2014).

33. Momentum dependence in K-edge resonant inelastic x-ray scattering and its application to screening dynamics in CE-phase La₀_.₅Sr₁_.₅MnO₄

T. F. Seman, X. Liu, J. P. Hill, M. van Veenendaal, K. H. Ahn, Phys. Rev. B 90, 45111 (2014).

32. Role of complex energy landscapes and strains in multiscale inhomogeneities in perovskite manganites

K. H. Ahn, T. F. Seman, T. Lookman, and A. R. Bishop, Phys. Rev. B 88, 144415 (2013). (Cited 15 times)

31. Strongly momentum-dependent screening dynamics in La₀_.₅Sr₁_.₅MnO₄ observed with resonant inelastic x-ray scattering

X. Liu, T. F. Seman, K. H. Ahn, M. van Veenendaal, D. Casa, D. Prabhakaran, A. T. Boothroyd, H. Ding, and J. P. Hill, Phys. Rev. B 87 - Rapid Commun., 201103(R) (2013).

30. Symmetry-mode-based atomic scale formalism of lattice dynamics

T. F. Seman, J. Moon, and K. H. Ahn, Emerging Materials Research 2, 5-16 (2013).

29. Effects of rare earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites

T. F. Seman, K. H. Ahn, T. Lookman, A. Saxena, A. R. Bishop, and P. B. Littlewood, Phys. Rev. B 86, 184106 (2012).

28. Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy₃Fe₅O₁₂ garnet

T. D. Kang, E. C. Standard, P. D. Rogers, K. H. Ahn, A. A. Sirenko, A. Dubroka and C. Bernhard, S. Park, Y. J. Choi, and S.-W. Cheong, Phys. Rev. B 86 , 144112 (2012). (Cited 13 times)

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). (Cited 25 times)

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). (Cited 16 times)

[Selected for Editors' Suggestion]

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). (Cited 23 times)

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).

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 25 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 13 times)

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).

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 20 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 22 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 37 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 506 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, 2005 Magnetism and Magentic Materials Conference, and 2015 TMS Annual Meeting.]

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 36 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 55 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 29 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 26 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 59 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 20 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 84 times)

6. Effects of the uniaxial strain in LaMnO₃

K. H. Ahn and A. J. Millis, Phys. Rev. B 64, 115103 (2001).(Cited 54 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 81 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 215 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 54 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 324 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 132 times)

Conference Proceedings, Magazine Articles and Book Chapters

Published at NJIT

11. Role of Complex Energy Landscapes and Strains in Multiscale Inhomogeneities in Perovskite Manganites

K. H. Ahn, T. F. Seman, T. Lookman, and A. R. Bishop, TMS 2015 Annual Meeting Supplemental Proceedings, 545 (2015).

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).

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).

Published before NJIT

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).

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).

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).

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).

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).

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 107 times)