Gang Cao is an American condensed matter physicist,academic,author,and researcher. He is a professor of physics at the University of Colorado Boulder.[1] and Director of Center for Experiments on Quantum Materials. Gang Cao served as the founding chair of the American Physical Society (APS) Topical Group on Quantum Materials Synthesis in 2023-2025.
Cao has published two books and more than 280 articles. His work has been cited more than 17,500 times,and his h-index is 70,according to Google Scholar.[2] Cao's research interests focus on discovery and synthesis of 4d- and 5d-transition metal materials and study of physical properties of these materials as functions of temperature,magnetic field,pressure and electrical current. His most recent book entitled Physics of Spin-Orbit-Coupled Oxides reviews recent work in the field of 4d- and 5d-transition metal oxides,a field he helped initiate in the late 1990s.[3]
Cao was an elected Fellow of the American Physical Society (DCMP) in 2009.[4]
Education
Cao received his Ph.D. in Physics under direction of Jack E. Crow at Temple University in Philadelphia in 1993.[1]
Career
Upon receiving his Ph.D. degree,Cao joined the National High Magnetic Field Laboratory (NHMFL) as a Postdoc (1993-1995),Assistant Scientist (1995-1998),and then Associate Scientist (1998-2002). He then relocated to the University of Kentucky as an Associate Professor of Physics in 2002. He was promoted to Professor in 2007 and became a Jack and Linda Gill Eminent Professor in 2011. He served as a founding Director of Center for Advanced Materials at Kentucky from 2008 to 2016. In 2015,he was awarded the Albert D. &Elizabeth H. Kirwan Memorial Prize for Outstanding Contributions to Original Research or Creative Scholarship.[5] In 2016,he joined the faculty of University of Colorado at Boulder as a Professor of Physics.[1] He is now Director of Center for Experiments on Quantum Materials at University of Colorado at Boulder.
Research
Cao's research primarily focuses on discovery and synthesis of 4d- and 5d-transition metal materials and study of physical properties of these materials in single-crystal form as functions of temperature,magnetic field,pressure and electrical current,[6][7] often at extreme conditions of high magnetic fields,high pressures and ultralow temperatures. In the early 1990s,he became interested in new materials,particularly those containing no 3d-transition metals,and started exploring ruthenates,[8][9][10] rhodates,[11] and iridates[12][13][14][15] in search of novel materials and phenomena. This research effort has been intensified and extended over the last two decades. Cao is among very few who conducted pioneering studies of 4d- and 5d-transition metal oxides whose physics is dictated by a delicate interplay between the Coulomb and spin-orbit interactions.
Bibliography
Books
Frontiers of 4d- and 5d-transition Metal Oxides (2013),Gang Cao and Lance E. DeLong,ed. ISBN 9789814374866;World Scientific
Physics of Spin-Orbit-Coupled Oxides (2021),Gang Cao and Lance E. DeLong,ISBN 9780199602025;Oxford University Press
Selected articles
Cao,G.,McCall,S.,Crow,J. E.,&Guertin,R. P. (1997). Observation of a metallic antiferromagnetic phase and metal to nonmetal transition in Ca 3 Ru 2 O 7. Physical Review Letters,78(9),1751.
Cao,G.,McCall,S.,Shepard,M.,Crow,J. E.,&Guertin,R. P. (1997). Thermal,magnetic,and transport properties of single-crystal Sr 1−x Ca x RuO 3 (0<~ x<~ 1. 0). Physical Review B,56(1),321.
Cao,G.,McCall,S.,Shepard,M.,Crow,J. E.,&Guertin,R. P. (1997). Magnetic and transport properties of single-crystal Ca 2 RuO 4:Relationship to superconducting Sr 2 RuO 4. Physical Review B,56(6),R2916.
Cao,G.,Bolivar,J.,McCall,S.,Crow,J. E.,&Guertin,R. P. (1998). Weak ferromagnetism,metal-to-nonmetal transition,and negative differential resistivity in single-crystal Sr 2 IrO 4. Physical Review B 57(18),R11039.
Cao,G.,Xin,Y.,Alexander,C. S.,Crow,J. E.,Schlottmann,P.,Crawford,M. K.,... &Marshall,W. (2002). Anomalous magnetic and transport behavior in the magnetic insulator Sr 3 Ir 2 O 7. Physical Review B,66(21),214412.
Lin,X. N.,Zhou,Z. X.,Durairaj,V.,Schlottmann,P.,&Cao,G. (2005). Colossal Magnetoresistance by Avoiding a Ferromagnetic State in the Mott System Ca 3 Ru 2 O 7. Physical Review Letters,95(1),017203.
Kim,B. J.,Jin,H.,Moon,S. J.,Kim,J. Y.,Park,B. G.,Leem,C. S.,... &Rotenberg,E. (2008). Novel J eff= 1/2 Mott state induced by relativistic spin-orbit coupling in Sr2IrO4. Physical Review Letters,101(7),076402.
Qi,T. F.,Korneta,O. B.,Parkin,S.,De Long,L. E.,Schlottmann,P.,&Cao,G. (2010). Negative volume thermal expansion via orbital and magnetic orders in Ca 2 Ru 1−x Cr x O 4 (0<x<0.13). Physical Review Letters,105(17),177203.
Ge,M.,Qi,T. F.,Korneta,O. B.,De Long,D. E.,Schlottmann,P.,Crummett,W. P.,&Cao,G. (2011). Lattice-driven magnetoresistivity and metal-insulator transition in single-layered iridates. Physical Review B,84(10),100402.
Cao,G.,Qi,T. F.,Li,L.,Terzic,J.,Yuan,S. J.,DeLong,L. E.,... &Kaul,R. K. (2014). Novel Magnetism of Ir 5+(5 d 4) Ions in the Double Perovskite Sr 2 YIrO 6. Physical Review Letters,112(5),056402.
Cao,G.,Terzic,J.,Zhao,H. D.,Zheng,H.,De Long,L. E.,&Riseborough,P. S. (2018). Electrical control of structural and physical properties via strong spin-orbit interactions in Sr 2 IrO 4. Physical Review Letters,120(1),017201.
Cao,G.,&Schlottmann,P. (2018). The challenge of spin–orbit-tuned ground states in iridates:a key issues review. Reports on Progress in Physics,81(4),042502.
Zhao,H.,Hu,B.,Ye,F.,Hoffmann,C.,Kimchi,I.,&Cao,G. (2019). Nonequilibrium orbital transitions via applied electrical current in calcium ruthenates. Physical Review B,100(24),241104.
Cao,G.,Zheng,H.,Zhao,H.,Ni,Y.,Pocs,C. A.,Zhang,Y.,... &Kimchi,I. (2020). Quantum liquid from strange frustration in the trimer magnet Ba 4 Ir 3 O 10. npj Quantum Materials,5(1),1–8.
Ni,Y.,Zhao,H.,Zhang,Y.,Hu,B.,Kimchi,I.,&Cao,G. (2021). Colossal magnetoresistance via avoiding fully polarized magnetization in the ferrimagnetic insulator Mn 3 Si 2 Te 6. Physical Review B,103(16),L161105.
Zhang,Y.,Ni,Y.,Zhao,H.,Hakani,S.,Ye,F.,DeLong,L.,Kimchi,I.,and Cao,G.(2022),Control of chiral orbital currents in a colossal magnetoresistance material,Nature 611,467–472,DOI:10.1038/s41586-022-05262-3
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