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Most Recent Publications/Submissions

Chiral orbital currents in a colossal resistance material

Application of a magnetic field aligns chiral orbital currents, which drastically enhances electric conductivuty. 

  • Emergence of spinons in layered trimer iridate Ba4Ir3O10,Y. Shen, J. Sears, G. Fabbris, A. Weichselbaum, W. Yin, H. Zhao, D. G. Mazzone, H. Miao, M. H. Upton, D. Casa, R. S. Acevedo-Esteves, C. Nelson, A. M. Barbour, C. Mazzoli, G. Cao, and M. P. M. Dean, Phys. Rev. Lett.129, 207201 (2022)

          

RIXS

(b) During the RIXS process, one Ir spin is flipped (cyan arrow), changing the trimer state at low energies and creating two spinons (domain walls).

(c) The spinons can propagate in the zigzag chain along the c direction by flipping the neighboring spins.

                                                                                                                                                                            

Monographs:

Physics of Spin-Orbit-Coupled Oxides Gang Cao and Lance E. DeLong, Oxford University Press, ISBN 978-0-19-960202-5; 2021

  Book cover for Physics of Spin-Orbit-Coupled Oxides                                                                                        

Frontiers of 4d- and 5d-Transition Metal Oxides, Gang Cao and Lance E. De Long, World Scientific, London, 2013; ISBN: 978-981-4374-859

                                                                                              Book cover for Frontiers of 4d and 4d transition metal oxides

Selected Publications (out of 260)

  1. Evidence for bootstrap percolation dynamics in a photoinduced phase transition, Tyler Carbin, Xinshu Zhang, Adrian B. Culver, Hengdi Zhao, Alfred Zong, Rishi Acharya, Cecilia J. Abbamonte, Rahul Roy, Gang Cao, and Anshul Kogar, Phys. Rev. Lett130, 186902 (2023)

  2. Control of chiral orbital currents in a colossal magnetoresistance material, Yu Zhang, Yifei Ni, Hengdi Zhao, Sami Hakani, Feng Ye, Lance DeLong, Itamar Kimchi and Gang Cao, Nature 611, 467–472 (2022)

  3. Stabilization of collinear ferromagnetic order in Ir-doped triple-layer ruthenate Sr4Ru3O10, Feng Ye,  Zachary Morgan, Yu Zhang,  Yifei Ni, and G. Cao, Phys. Rev. B 108, L241109 (2023); Editors’ Suggestion
  4. Emergence of spinons in layered trimer iridate Ba4Ir3O10,Y. Shen, J. Sears, G. Fabbris, A. Weichselbaum, W. Yin, H. Zhao, D. G. Mazzone, H. Miao, M. H. Upton, D. Casa, R. S. Acevedo-Esteves, C. Nelson, A. M. Barbour, C. Mazzoli, G. Cao, and M. P. M. Dean, Phys. Rev. Lett.129, 207201 (2022)

  5. Keldysh space control of charge dynamics in a strongly driven Mott insulator, Xinwei Li, Honglie Ning, Omar Mehio, Hengdi Zhao, Min-Cheol Lee, Kyungwan Kim, Fumihiko Nakamura, Yoshiteru Maeno, Gang Cao, and David Hsieh, Phys. Rev. Lett. 128, 187402 (2022) 

  6. Mechanical control of physical properties in the van der Waals ferromagnet Cr2Ge2Te6 via application of electric current, Hengdi Zhao, Yifei Ni, Bing Hu, Sabastian Selter, Saicharan Aswartham, Yu Zhang, Bernd Buchner, Pedro Schlottmann, and Gang Cao, Phys. Rev. B 106, L041103 (2022)

  7. Magnetic structure and spin fluctuations in the colossal magnetoresistance ferrimagnet Mn3Si2Te6, Feng Ye, Masaaki Matsuda, Zachary Morgan, Todd Sherline,Yifei Ni, Hengdi Zhao ,and G. Cao, Letter of Phys. Rev. B 106, L180402 (2022); Editors' Suggestion

  8. Monograph: Physics of Spin-Orbit-Coupled Oxides Gang Cao and Lance E. DeLong, Oxford University Press, ISBN 978-0-19-960202-5; 2021

  9. Colossal magnetoresistance via avoiding fully polarized magnetization in ferrimagnetic insulator Mn3Si2Te6, Yifei Ni, Hengdi Zhao, Yu Zhang, Bing Hu, Itamar Kimchi and Gang Cao, Phys. Rev. B 103, L161105 (2021);Editors' Suggestion
  10. Flexible lattice in Ca3Ru2O7: Control of the electrical transport via anisotropic magnetostriction, Hengdi Zhao, Hao Zheng, Jasminka Terzic, Wenhai Song, Yifei Ni, Yu Zhang, Pedro Schlottmann and Gang Cao, Phys. Rev. B 104, L121119 (2021)

  11. The ground state in a proximity to a possible Kitaev spin liquid: An undistorted honeycomb iridate NaxIrO3 (0.60 < x < 0.80), Hengdi Zhao, Bing Hu, Feng Ye, Minhyea Lee, Pedro Schlottmann and Gang Cao, Letter of Phys. Rev. B 104L041108 (2021); Editors' Suggestion

  12. Quest for quantum states via field-editing technology, Gang Cao, Hengdi Zhao, Bing Hu, Nicholas Pellatz, Dmitry Reznik, Pedro Schlottmann and Itamar Kimchinpj Quantum Mater. 5, 83 (2020)

  13. Quantum liquid from strange frustration in the trimer magnet Ba4Ir3O10, G. Cao, H. D. Zhao, H. Zheng, Y. F. Ni, Christopher. A. Pocs, Y. Zhang, Feng, Ye, Christina Hoffmann, Xiaoping Wang, Minhyea Lee, Michael Hermele and Itamar Kimchi, npj Quantum Mater. 5, 26 (2020)

  14. Topical Review: Towards electrical-current control of quantum states in spin-orbit-coupled matter, Gang Cao, Journal of Physics: Condensed Matter 32, 423001 (2020)  

  15. Possible quantum paramagnetism in compressed Sr2IrO4, D. Haskel, G. Fabbris, J. H. Kim, L. S. I. Veiga, J. R. L. Mardegan, C. A. Escanhoela, Jr., S. Chikara, V. Struzhkin, T. Senthil, B. J. Kim, G. Cao, and J.W. Kim, Phys. Rev. Lett. 124, 067201 (2020)

  16. Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4, Feng Ye, Christina Hoffmann, Wei Tian, Hao Zheng, Hengdi Zhao, and G. Cao, Phys. Rev. B 102, 115120 (2020)

  17. Persistent insulating state at megabar pressures in strongly spin-orbit-coupled Sr2IrO4, Chunhua Chen, Yonghui Zhou, Xuliang Chen, Tao Han, Chao An, Ying Zhou, Yifang Yuan, Bowen Zhang, Shuyang Wang, Ranran Zhang, Lili Zhang, Changjing Zhang, Zhaorong Yang, Lance E. DeLong and Gang Cao, Phys. Rev. B 101, 144102 (2020)

  18. Direct detection of dimer orbitals in Ba5AlIr2O11, Y. Wang, Ruitang Wang, Jungho Kim, M. H. Upton, D. Casa, T. Gog, G. Cao, J. P. Hill, G. Kotliar,M. P. M. Dean,and X. Liu, Phys. Rev. Lett.,122, 106401 (2019)

  19. Nonequilibrium orbital transitions via applied electrical current in calcium ruthenate, Hengdi Zhao, Bing Hu, Feng Ye, Christina Hoffmann, Itamar Kimchi and Gang Cao; Phys. Rev. B 100, 241104(R) (2019)

  20. Electrical control of structural and physical properties via spin-orbit interactions in Sr2IrO4, G. Cao, J. Terzic, H. D. Zhao, H. Zheng, Peter Riseborough, L. E. DeLong, Phys. Rev. Lett. 120017201 (2018); Editors' Suggestion

  21. Observation of a pressure-induced transition from interlayer ferromagnetism to intralayer antiferromagnetism in Sr4Ru3O10, H . Zheng, W.H. Song, J. Terzic, H. D. Zhao, Y. Zhang, Y. F. Ni, L. E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. B 98064418 (2018); Editors' Suggestion

  22. The Challenge of spin-orbit-tuned ground states in iridates: A Key Issues Review, Gang Cao and Pedro Schlottmann, Reports on Progress in Physics 81 042502 (2018) 

  23. Novel magnetism of Ir5+ (5d4) ions in the double perovskite Sr2YIrO6, G. Cao, T. F. Qi, L. Li, J. Terzic, S. J. Yuan, L. E. DeLong, G. Murthy and R. K. Kaul, Phys. Rev. Lett112, 056402 (2014)

  24. Lattice-tuned magnetism of Ru4+(4d4) ions in single-crystals of the layered honeycomb ruthenates: Li2RuO3 and Na2RuO3, J. C. Wang, J. Terzic, T. F. Qi, Feng Ye, S. J. Yuan, S. Aswartham, S. V. Streltsov, D. I. Khomskii, R. K. Kaul and G. Cao, Phys. Rev. B 90 161110 (R) (2014)

  25. MonographFrontiers of 4d- and 5d-Transition Metal Oxides, Gang Cao and Lance E. De Long, World Scientific, London, 2013; ISBN: 978-981-4374-859

  26. Negative volume thermal expansion via orbital and magnetic orders in single-crystal Ca2Ru1-xCrxO4, T.F. Qi, O.B. Korneta, S. Parkin, L.E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. Lett. 105, 177203 (2010)

  27. Observation of strong spin valve effect in bulk Ca3(Ru1-xCrx)2O7, G. Cao, V. Durairaj S. Chikara L. E. DeLong and P. Schlottmann, Phys. Rev. Lett100, 159902 (2008)

  28. Colossal magnetoresistance by avoiding a ferromagnetic state in Mott system Ca3Ru2O7, X. N. Lin, Z.X. Zhou, V. Durairaj, P. Schlottmenn and G. Cao, Phys. Rev. Lett95, 017203 (2005)

  29. Anomalous magnetic and transport properties in magnetic insulator Sr3Ir2O7, G. Cao, Y. Xin, C. S. Alexander, J.E. Crow and P. Schlottmann, Phys. Rev. B 66, 214412 (2002)

  30. Charge density wave formation accompanying ferromagnetic ordering in quasi-one-dimensional BaIrO3, G. Cao, J.E. Crow, R.P. Guertin, P. Henning, C.C. Homes, M. Strongin, D.N. Basov, and E. Lochner, Solid State Comm. 113, 657 (2000)

  31. Weak ferromagnetism, metal-to-nonmetal transition and negative differential resistivity in single crystal Sr2IrO4, G. Cao, J. Bolivar, S. McCall, J.E. Crow, and R.P. Guertin, Phys. Rev. B 57, R11039 (1998)

  32. Observation of a metallic antiferroamgnetic phase and metal-nonmetal transition in Ca3Ru2O7, G. Cao, S. McCall, J.E. Crow and R.P. Guertin, Phys. Rev. Lett78, 1751 (1997)

  33. Thermal, magnetic and transport properties of single crystal Sr1-xCaxRuO3 (0 < x < 1.0), G. Cao, S. McCall, M. Shepard, J. E. Crow, and R. P. Guertin, Phys. Rev. B 56, 321 (1997)

  34. Magnetic and transport properties of single crystal Ca2RuO4: Relationship to superconducting Sr2RuO4, G. Cao, S. McCall, M. Shepard, J.E. Crow and R.P. Guertin, Phys. Rev. B 56, R2916 (1997)