Visualizing Quantum Matter at the Atomic-Scale

Davis Group research concentrates upon the fundamental physics of electronic, magnetic and atomic quantum matter. A specialty is development of innovative instrumentation to allow direct visualization (or perception) of characteristic quantum many-body phenomena at atomic scale. Among the fields of active interest today are:

Cooper-Pair Condensates (Prof. A.P. Mackenzie - MPI CPfS Dresden)
Quantum Spin and Monopole Fluids (Prof. S. Blundell - Oxford)
Magnetic Topological Insulators (Dr. Genda Gu – Brookhaven NL)
Topological Kondo Insulators (Prof. J. E. Hoffman - Harvard University)
Cu/Fe HT Superconductors (Dr. H. Eisaki – AIST; Prof. P. Canfield – AMES)
Topo. & Weyl Superconductors (Prof. Claudia Felser - MPI CpFS Dresden)
Viscous Electron Fluids (Prof. A.P. Mackenzie - MPI CPfS Dresden)
Macroscopic Quantum Interferometers
Quantum Microscope Development

Davis Group plans to operate two suites of ultra-low vibration laboratories, one in Beecroft Building at Oxford University (UK) and the other in the Kane Building at University College Cork (IE). Ours is a single research group conducting scientifically harmonized studies with complementary scientific instruments at Oxford and Cork. The overall objective is to exploit the distinct capabilities and facilities at both laboratories to maximize scientific efficiency.

Mobile : +1 607-220-8685 / +353-83-039-2937
Contact : jcseamusdavis@gmail.com

Magnetic Monopole Noise, Ritika Dusad, Franziska K. K. Kirschner, Jesse C. Hoke, Benjamin Roberts, Anna Eyal, Felix Flicker, Graeme M. Luke, Stephen J. Blundell, J. C. Séamus Davis Nature 571, 234 (2019)

Machine Learning in Electronic Quantum Matter Visualization Experiments Yi Zhang, A. Mesaros, K. Fujita, S.D. Edkins, M.H. Hamidian, K. Ch'ng, J.C. Séamus Davis, E. Khatami and Eun-Ah Kim, Nature 570, 484 (2019).

Magnetic-field Induced Pair Density Wave State in the Cuprate Vortex Halo. S.D. Edkins, A. Kostin, K. Fujita, A. P. Mackenzie, H. Eisaki, S. Uchida, Subir Sachdev, M. J. Lawler, Eun-Ah Kim, J.C. Séamus Davis and M. H. Hamidian, Science 364, 976 (2019).

Discovery of Orbital-Selective Cooper Pairing in FeSe, P.O Sprau, A. Kostin, A. Kreisel, A. E. Böhmer, V. Taufour, P.C. Canfield, S. Mukherjee, P.J. Hirschfeld, B.M. Andersen, J. C. Séamus Davis, Science 357, 75 (2017).

Detection of a Cooper-Pair Density Wave in Bi2Sr2CaCu2O8+x, M. Hamidian S. D. Edkins, S.-H. Joo, A. Kostin, H. Eisaki, S. Uchida, M. J. Lawler, E. -A. Kim, A. P. MacKenzie, K. Fujita, J. Lee, J. C. Séamus Davis, Nature 532, 343 (2016)

Simultaneous Transitions in Cuprate Momentum-Space Topology and Electronic Symmetry Breaking. K. Fujita, C.K. Kim, Inhee Lee, Jinho Lee, M. H. Hamidian, I. Firmo, H. Eisaki, S. Uchida, M.J. Lawler, E.-A. Kim, and J.C. Séamus Davis. Science 344, 612 (2014).

Anisotropic Energy-Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs Milan P. Allan, A. W. Rost, A. P. Mackenzie, Yang Xie, J. C. Séamus Davis, K. Kihou, H. Eisaki, and Tien-Ming Chuang, Science 336, 563, (2012).

Topological Defects Coupling Smectic Modulation to Intra-Unit–Cell Nematicity in Cuprates A. Mesaros, K. Fujita, H. Eisaki, S.I. Uchida, J.C. Séamus Davis, S.Sachdev, J.Zaanen, M.J. Lawler and Eun-Ah Kim, Science 333, 426 (2011).

Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He, E.J. Pratt, B. Hunt, V. Gadagkar, M. Yamashita, M. J. Graf, A. V. Balatsky and J.C. Davis, Science 332 821, (2011).

Intra-unit-cell Electronic Nematicity of the High-Tc Cuprate Pseudogap States, M. J. Lawler, K. Fujita, Jhinhwan Lee, A.R. Schmidt, Y. Kohsaka, Chung Koo Kim, H. Eisaki, S. Uchida, J.C. Séamus Davis, J.P. Sethna, and Eun-Ah Kim, Nature 466, 374 (2010).

Imaging the Fano Lattice to Hidden Order transition in URu2Si2, A.R. Schmidt, M. H. Hamidian, P. Wahl, F. Meier, A. Balatsky, T. Williams, G.M. Luke and J.C. Seamus Davis, Nature 465, 570 (2010).

Nematic Electronic Structure in the ‘Parent’ State of Iron-based Superconductor Ca(Fe1-xCox)2As2, T.-M. Chuang, M.P. Allan, J.Lee, Ni Ni, S. Bud’ko, G. Boebinger, P.C. Canfield & J.C. Séamus Davis, Science 327, 181 (2010).

Spectroscopic Fingerprint of Phase Incoherent d-Wave Superconductivity in the Cuprate Pseudogap State, Jhinhwan Lee, K. Fujita, C.-K. Kim, A. Schmidt, H. Eisaki, S. Uchida, and J.C. Séamus Davis, Science 325, 1099 (2009).

Evidence for a ‘Superglass’ State in Solid 4He, B. Hunt, E. Pratt, V. Gadagkar, M. Yamashita, A. V. Balatsky & J.C. Séamus Davis, Science 324, 632 (2009).

How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+ Y. Kohsaka, C. Taylor, P. Wahl, A. Schmidt, Jhinhwan Lee, K. Fujita, J. Alldredge, Jinho Lee, K. McElroy, H. Eisaki, S. Uchida, D.-H. Lee, & J.C. Séamus Davis, Nature 454, 1072 (2008).

An intrinsic bond-centered electronic glass with disperse unidirectional domains in underdoped cuprates, Yuhki Kohsaka, C. Taylor, A. Schmidt, K. Fujita, C. Lupien, T. Hanguri, H. Eisaki, S. Uchida, H. Takagi and J. C. Séamus Davis, Science 315, 1380 (2007).

The Ground State of Pseudogap in Cuprates: La1.875Ba0.125CuO4, T. Valla, A. V. Fedorov, J. C. Davis , Jinho Lee, and G. D. Gu, Science 314, 1914 (2006).

Interplay of electron-lattice interactions and superconductivity in Bi2Sr2CaCu2O8+d Jinho Lee, K. Fujita, K. McElroy, J.A. Slezak, M. Wang, Y. Aiura, H. Bando, M. Ishikado, T. Masui, J. -X. Zhu, A. V. Balatsky, H. Eisaki, S. Uchida, and J. C. Davis, Nature 442, 546 (2006).

Atomic-scale Sources and Mechanism of Nanoscale Electronic Disorder in Bi2Sr2CaCu2O8+d Kyle McElroy, Jinho Lee, James Slezak, D.-H. Lee, H. Eisaki, S. Uchida, J.C. Seamus Davis. Science 309, 1048 (2005).

A ‘checkerboard’ electronic crystal state in Lightly Hole-Doped Ca2-xNaxCuO2Cl2 Tetsuo Hanaguri, C. Lupien, Y. Kohsaka, D.-H. Lee, M. Takano, H. Takagi, & J. C. Seamus Davis. Nature 430, 1001 (2004)

Relating atomic scale electronic phenomena to wave-like quasiparticle states in superconducting Bi2Sr2CaCu2O8+d K. McElroy, R. W. Simmonds, J. E. Hoffman, D.-H. Lee, J. Orenstein, H. Eisaki, S. Uchida & J.C. Seamus Davis., Nature 422, 520 (2003).

Imaging Quasiparticle Interference in Bi2Sr2CaCu2O8+d” J. Hoffman, K. McElroy, D-H Lee, K.M. Lang, H Eisaki, S. Uchida, and J. C. Seamus Davis, Science 297, 1148 (2002).

A four unit cell periodic pattern of quasiparticle states surrounding vortex cores in Bi2Sr2CaCu2O8+d J. E. Hoffman, E.W. Hudson, K. Lang, V. Madhavan, H. Eisaki, S. Uchida, and J.C. Davis, Science 266,455 (2002

Imaging the granular structure of high-Tc superconductivity in underdoped Bi2Sr2CaCu2O8+d, K. M. Lang, V. Madhavan, J. Hoffman, E.W. Hudson, H. Eisaki, S. Uchida, and J.C. Davis, Nature 415, 412 (2002).

Microscopic electronic inhomogeneity in the high-temperature superconductor Bi2Sr2CaCu2O8+d S. H. Pan, J. O’Neil, R.L. Badzey, H. Ding, Z. Wang, H. Esiaki, S. Uchida, A. Gupta. K-W Ng, E. W. Hudson K.M. Lang and J. C. Davis, Nature 413 282 (2001).

Imaging the Effects of Individual Zinc Impurity Atoms in Bi2Sr2CaCu2O8+d, S.H. Pan, E.W. Hudson, K.M. Lang, H. Eisaki, S. Uchida, and J.C. Davis, Nature 403, 746 (2000)

Quantum Interference of Superfluid 3He, R. W. Simmonds, A. Marchenkov, J. C. Davis and R.E. Packard, Nature 412 55 (2001).

Josephson effect and a -state in superfluid 3He, S. Backhaus, R. W. Simmonds, A. Loshak, J. C. Davis & R. E. Packard, Nature 397, 485 (1999)

Atonic-scale Quasi-Particle Scattering Resonances in Bi2Sr2CaCu2O8+d, E. Hudson, S. Pan, A. K. Gupta, K-W Ng, and J.C. Davis, Science 285, 88 (1999)

Interplay of magnetism and high-Tc superconductivity at individual magnetic impurity atoms in Bi2Sr2CaCu2O8+ Hudson, E.W., Lang. K, Madhavan, V., Pan, S.H., Eisaki, H., Uchida, S. & Davis, J.C. Nature 411 920 (2001).

Direct measurement of the current-phase relationship of a superfluid 3He weak link, Backhaus S., Pereverzev S.V., Davis J.C. Seamus, and Packard R.E., Science 278, 1435-1438 (1997).

Discovery of a metastable -state in superfluid 3He weak link, S. Backhaus, R. Simmonds, S. Pereverzev, A. Loshak, J.C. Seamus Davis, Richard E.. Packard, Nature 392, 687-690 (1998).

Observation of Third Sound in Superfluid 3He A.M. R Schechter, R.W. Simmonds, R.E. Packard, and J.C. Davis, Nature 396, 554-557 (1998).

Quantum oscillations between two weakly coupled reservoirs of superfluid 3He S.V. Pereverzev, A. Loshak, S. Backhaus, J.C. Seamus Davis and R.E. Packard, Nature 388, 449 (1997).

Research plans