Emergent electronic and magnetic properties in quantum materials including high-temperature superconductivity, unconventional magnetism, and metal-insulator transitions. In particular, we are interested in how properties can be controlled in artificially engineered quantum materials grown by molecular beam epitaxy using parameters such as interfacial engineering, heterostructuring, epitaxial strain, and dimensional confinement.
Our research focuses on investigating many-body interactions in quantum materials, with the aim of controlling potentially exotic properties such as superconductivity, magnetism, metal-insulator transitions, and topological properties. We employ a combination of techniques including angle-resolved photoemission spectroscopy (ARPES), molecular beam epitaxy (MBE), and synchrotron-based x-ray probes including x-ray absorption spectroscopy and resonant x-ray scattering. A major research thrust is the synthesis and investigation of artificially engineered heterostructures of quantum materials synthesized by molecular beam epitaxy (MBE) with strong electron correlations which allow new emergent states to be created at the interface.
Shuolong Yang (Kavli Fellow), Pramita Mishra, Ludi Miao
Haofei Wei, Ed Lochocki, Jacob Ruf, Brendan Faeth, Jocienne Nelson, Chris Parzyck
Sophie Crisp, Alex Hirst, Yifan Su, Matthew Fu
K.M. Shen. Putting the squeeze on superconductivity. Science 355, 133 (2017).
C. Gutiérrez, C.-J. Kim, L. Brown, E.B. Lochocki, K.M. Shen, J. Park, and A.N. Pasupathy. Imaging chiral symmetry breaking from Kekulé bond order in graphene. Nature Physics 12, 950 (2016).
H.I. Wei, C. Adamo, E.A. Nowadnick, E.B. Lochocki, S. Chatterjee, J.P. Ruf, M.R. Beasley, D.G. Schlom, and K.M. Shen. Electron Doping of the Parent Cuprate La2CuO4 without Cation Substitution. Physical Review Letters 117 (2016).
B. Burganov, C. Adamo, A. Mulder, M. Uchida, P.D.C. King, J.W. Harter, D.E. Shai, A.S. Gibbs, A.P. Mackenzie, R. Uecker, M. Bruetzam, M.R. Beasley, C.J. Fennie, D.G. Schlom, and K.M. Shen. Strain Control of Fermiology and Many-Body Interactions in Two-Dimensional Ruthenates. Physical Review Letters 116, 197003 (2016).
Y.F. Nie, D. Di Sante, S. Chatterjee, P.D.C. King, M. Uchida, S. Ciuchi, D.G. Schlom, and K.M. Shen. Formation and observation of a quasi-two-dimensional dxy electron liquid in epitaxially stabilized Sr2-xLaxTiO4 thin films. Physical Review Letters 115, 096405 (2015)
P.D.C. King, H.I. Wei, Y.F. Nie, M. Uchida, C. Adamo, S. Zhu, X. He, I. Bozovic, D.G. Schlom, and K.M. Shen. Atomic-scale control of competing electronic phases in ultrathin LaNiO3. Nature Nanotechnology 9, 443 (2014)
Y.F. Nie, P.D.C. King, C.H. Kim, M. Uchida, H.I. Wei, C.J. Fennie, D.G. Schlom, and K.M. Shen. Interplay of spin-orbit interactions, dimensionality, and octahedral rotations in semimetallic SrIrO3. Physical Review Letters 114, 016401 (2015)
E.J. Monkman, C. Adamo, J.A. Mundy, D.E. Shai, J.W. Harter, D.W. Shen, B. Burganov, D.A. Muller, D.G. Schlom, and K.M. Shen. Quantum Many-Body Interactions in Digital Oxide Superlattices. Nature Materials 11, 855 (2012)
Y.F. Nie, Y. Zhu, C.-H. Lee, L.F Kourkoutis, J.A. Mundy, J. Junquera, Ph. Ghosez, D.J. Baek, S. Sung, X.X. Xi, K.M. Shen, D.A. Muller, and D.G. Schlom. Atomically precise interfaces from non-stoichiometric deposition. Nature Communications 5:4530 (2014)
K.E. Arpino, D.C. Wallace, Y.F. Nie, T. Birol, P.D.C. King, S. Chatterjee, M. Uchida, S.M. Koohpayeh, J.-J. Wen, K. Page, C.J. Fennie, K.M. Shen, and T.M. McQueen. Evidence for Topologically Protected Surface States and a Superconducting Phase in [Tl4](Tl1−xSnx)Te3 Using Photoemission, Specific Heat, and Magnetization Measurements, and Density Functional Theory. Physical Review Letters 112, 017002 (2014)
S. Chatterjee, J. Trinckauf, T. Hanke, D.E. Shai, J.W. Harter, T.J. Williams, G.M. Luke, K.M. Shen, and J. Geck. Formation of the Coherent Heavy Fermion Liquid at the Hidden Order Transition in URu2Si2. Physical Review Letters 110, 186401 (2013)
D.E. Shai, C. Adamo, D.W. Shen, C.M. Brooks, J.W. Harter, E.J. Monkman, B. Burganov, D.G. Schlom, and K.M. Shen. Quasiparticle Mass Enhancement and Temperature Dependence of the Electronic Structure of Ferromagnetic SrRuO3 Thin Films. Physical Review Letters 110, 087004 (2013)