Gang Cao Portrait
(303) 735-4947

Office: DUAN F519

Research Interests

My research program combines a methodical search for novel quantum materials in single-crystal form, and a systematic effort to elucidate the underlying physics of these materials. Research activities in my lab include: (1) advanced techniques and comprehensive facilities to synthesize bulk single crystals of novel transition metal oxides and chalcogenides; and (2) a wide spectrum of skills and tools for experimental studies of structural, transport, magnetic, thermal and dielectric properties as functions of chemical composition, temperature, magnetic field, and pressure. Measurements are often carried out at extreme conditions, i.e. ultralow temperatures, high magnetic fields and high pressures. We have also established broad collaborations with leading scientists in the US and around the world.

Selected Publications

  1. Book: “Frontiers of 4d- and 5d- Transition Metal Oxides, Gang Cao and Lance E. De Long, World Scientific ISBN: 978-981-4374-859 328 pp June 2013
  2. Simultaneous Metal-Insulator and Antiferromagnetic Transitions in Orthorhombic Perovskite Iridate Sr0.94Ir0.78O2.68 Single Crystals”, H. Zheng, J. Terzic, Feng Ye, X.G. Wan, D. Wang, Jinchen Wang, Xiaoping Wang, P. Schlottmann, S. J. Yuan and G. Cao, Phys. Rev. B 93, 235157 (2016)
  3. Hallmarks of the Mott-Metal Crossover in the Hole Doped J=1/2 Mott Insulator Sr2IrO4”, Yue Cao, Qiang Wang, Justin A. Waugh, Theodore Reber, Haoxiang Li, Xiaoqing Zhou, Stephen Parham, Nicholas Plumb, Eli Rotenberg, Aaron Bostwick, Jonathan Denlinger, Tongfei Qi, K. Orenta, Michael Hermele, G. Cao and Daniel S. Dessau, Nature Comm, 2016, doi:10.1038/ncomms11367
  4. Pressure-Induced Confined Metal from the Mott Insulator Sr3Ir2O7”, Yang Ding, Cheng-Chien Chen, Heung-Sik Kim, Myung Joon Han, Zhenxing Feng, Mary Upton, Jungho Kim, Diego Casa,  Ayman Said,  Yufeng Peng, G. Cao, Thomas Gog, Ho-kwang Mao, and Michel van Veenendaal, Phys. Rev. Lett. 116, 216402 (2016)
  5. Evidence of an Odd-Parity Hidden Order in a Strongly Spin-Orbit Coupled Correlated Iridates”, L. Zhao, D. H. Torchinsky, H. Chu, V. Ivanov, R. Lifshitz, R. Flint, T. Qi, G. Cao and D. Hsieh, Nature Physics, 2015 doi:10.1038/nphys3517
  6. Crystal and Magnetic Structures in Square Lattice Iridate Sr2Ir1-xRhxO4”, Feng Ye, Xiaoping Wang, Christina Hoffmann, Songxue Chi, Masaaki Matsuda, Bryan C. Chakoumakos, Jaime A. Fernandez-Baca, Jinchen Wang and G. Cao, Phys. Rev. B, 92 201112(R) (2015)
  7. Decoupling of the Antiferromagnetic and Insulating States in Tb doped Sr2IrO4”, J. C. Wang, S. Aswartham, F. Ye, J. Terzic, H. Zheng, Daniel Haskel, Shalinee Chikara, Yong Choi, P. Schlottmann, S. J. Yuan1 and G. Cao, Phys. Rev. B 92, 214411 (2015)
  8. A Structural Distortion Induced Magneto-Elastic Locking in Sr2IrO4Revealed through Nonlinear Optical Harmonic Generation”, D. H. Torchinsky, H. Chu, L. Zhao, N. B. Perkins, Y. Sizyuk, T. Qi, G. Cao, and D. Hsieh, Phys. Rev. Lett. 114, 096404 (2015)
  9. Coexisting Charge and Magnetic Orders in the Dimer-Chain Iridate Ba5AlIr2O11”, J. Terzic, J. C. Wang, Feng Ye, W. H. Song, S. J. Yuan, S. Aswartham, L. E. DeLong, S.V. Streltsov, D.I. Khomskii and G. Cao, Phys. Rev. B 91, 235147 (2015)
  10. Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na2IrO3”, Zhanybek Alpichshev, Fahad Mahmood, G. Cao, and Nuh Gedik, Phys. Rev. Lett. 114, 017203 (2015)
  11. 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. Lett. 112, 056402 (2014)
  12. 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)
  13. Evolution of Magnetism in Single-Crystal Honeycomb Iridates”, G. Cao, T. F. Qi,  L. Li,  J. Terzic,  V. S. Cao, S. J. Yuan, M. Tovar,  G. Murthy,  and R. K. Kaul, Phys. Rev B 88 220414 (R) (2013)
  14.  “Tuning Jeff = 1/2 Insulating State via Electron Doping and Pressure in Double-Layered Iridate Sr3Ir2O7”, L. Li, P. P. Kong, T. F. Qi, C. Q. Jin, S. J. Yuan, L. E. DeLong, P. Schlottmann and G. Cao, Phys. Rev. B 87, 235127 (2013)
  15. The Magnetic and Crystal Structures of Sr2IrO4: A Neutron Diffraction Study”, Feng Ye, Songxue Chi, Bryan C. Chakoumakos, Jaime A. Fernandez-Baca, Tongfei Qi, and G. Cao, Phys. Rev. B 87, 140406(R) (2013)