People

Martin Greven

Martin Greven

Director; Principal Investigator
Email: 
greven@umn.edu
Phone: 
(612) 624-7542
Research interests: 
Martin Greven’s research focus is on the structural, electronic and magnetic properties of select quantum materials, especially complex oxides. This materials class embodies many of the most profound contemporary questions pertaining to the collective quantum behavior of interacting electrons. His research involves bulk single crystal growth, neutron and X-ray scattering, as well as transport and magnetometry experiments. Greven’s current projects in the CQM include rare-earth titanates (with Chubukov, Fernandes, Jalan, Leighton), both in their Mott-insulating state and across the insulator- metal transition, perovskite cobaltites (with Leighton), and the cuprate superconductors. Neutron and X-ray scattering are powerful probes that provide essential structural and magnetic information about new phases of matter and the transitions between them. Greven pursues such experiments at leading facilities in the US (especially Oak Ridge National Lab and Argonne National Lab) and abroad. He furthermore collaborates with experts in the use of complementary experimental techniques (e.g, Brookhaven National Lab, Caltech, Iowa State University/Ames Lab, Kyoto University, Peking University, UC Berkeley/Lawrence Berkeley National Lab, UC Davis, University of Geneva, University of Leipzig and Zagreb University).
Andrey Chubukov

Andrey Chubukov

Principal Investigator
Email: 
achubuko@umn.edu
Phone: 
(612) 626-0726
Research interests: 
My research interests are in the areas of high-temperature superconductivity, quantum magnetism, the origin of nematic order, non-Fermi liquid physics (fermionic incoherence) near various quantum phase transitions and how fermionic incoherence affects the interplay between superconductivity and competing orders. I recently started working on superconductivity at small carrier density -- the issue relevant to CQM research on SrTiO3. I am also working on the understanding of Greven's data on magnetic response in the cuprates. In my research, I mostly use analytical methods, but also use numerical methods to get results for realistic system parameters. Over the years, I collaborated with many theory colleagues and was also involved in the interpretation of neutron scattering, Raman, optical conductivity, photoemission, and thermodynamic (specific heat and static susceptibility) data.
Rafael Fernandes

Rafael Fernandes

Principal Investigator
Email: 
rfernand@umn.edu
Phone: 
(612) 625-9283
Research interests: 
My main research activities are in strongly correlated electronic many-body systems. I am interested in clean and disordered systems in which the collective behavior of the electrons gives rise to ordered states that break different symmetries of the system, such as superconductivity, magnetism, nematic ordering, and orbital ordering. My aim is to understand not only the impact of these individual phases on the electronic structure and macroscopic properties of the system, but also how they interact with each other. To achieve this goal, I rely not only on the theoretical methods from quantum statistical mechanics and many-body theory, but also on the invaluable empirical information obtained from a variety of experimental techniques, such as x-ray diffraction, neutron scattering, optical spectroscopy, thermodynamic measurements, and angle-resolved photo-emission spectroscopy. Within the CQM, I have been working specifically on the unusual normal state and superconducting properties of SrTiO3 and other diluted superconductors, as well as on the puzzling magnetic properties of Mott insulators such as rare-earth titanates.
Bharat Jalan

Bharat Jalan

Principal Investigator
Email: 
bjalan@umn.edu
Phone: 
(612) 625-4088
Research interests: 
The Jalan's group focuses on the growth of thin films and heterostructures of complex oxides using molecular beam epitaxy. In the context of CQM, the focus is on the investigation of role of disorder and doping on superconductivity in SrTiO3 thin films and related heterostructures including the study of unusual magnetic ground states, and strongly-correlated Mott-Hubbard-type insulator characteristics in rare-earth titanates. With the particular emphasis on synthesis with excellent control over stoichiometry, dimensionality and strain, the major goal in this project is to understand, and control the interplay between lattice, charge and spin degree of freedom and their coupling to the functionality such as exotic magnetism, and superconductivity. The work in Jalan’s group utilizes a range of structural and electrical characterization techniques available both at the University of Minnesota and in the national laboratory network in addition to through collaboration with experts around the world.
Chris Leighton

Chris Leighton

Principal Investigator
Email: 
leighton@umn.edu
Phone: 
(612) 625-4018
Research interests: 
Chris Leighton's research generally focuses on electronic and magnetic properties of materials, spanning from bulk single crystals to thin films and heterostructures. In the context of the CQM his work is focused on complex oxide materials, mostly cobaltites, titanates, and stannates, including synthesis, structural/chemical characterization, and a wide range of physical property measurements. The latter include neutron scattering (particularly small-angle neutron scattering, neutron reflectometry, and powder diffraction), as well as transport, magnetometry, heat capacity, etc. His current projects in the CQMfeature SrTiO3 (working with Fernandes), various perovskite cobaltites (again with Fernandes), rare-earth titanates (with Greven, Jalan, Fernandes), stannate semiconductors, and some complex metal alloy systems. Collaborations are ongoing with Oak Ridge National Lab, Argonne National Lab, University of California Santa Barbara, McGill University, Iowa State University/Ames Lab, Universidad Complutense de Madrid, and the National Institute for Standards and Technology. Recurring research themes include the understanding of competing forms of magnetic and electronic ordering in complex systems, and the interaction with defects and their control.

 

 

Senior Research Associates and Postdoctoral Fellows

Joe Batley
Maria Navarro Gastiasoro
Damjan Pelc
Laxman Raju Thoutam
Guichuan Yu

Graduate Students

Zachary Anderson
Vipul Chaturvedi
John Dewey
Sajna Hameed
Will Postiglione
Yang Tang
Jeff Walter
Helin Wang
Biqiong Yu
Jin Yue

Undergraduate Students

Nina Bielinski
Sylvia Griffitt
Nikhil Gupta
Yuka Nakato
Karl Olson
Liam Thompson
Madison Wieczorek