The new high-temperature cuprate superconductors offer a rich field for Professor
Markiewicz's research. Presently, Professor Markiewicz is modelling the spectral
responses of a variety of experimental probes, including angle-resolved photoemission
spectroscopy (ARPES), optical spectra, resonant inelastic X-ray scattering (RIXS), and
scanning tunneling spectroscopy (STM) -- the very probes that are providing continual new
insights into the physics of the cuprates. He has developed an intermediate-coupling
model of the cuprates, which can provide a detailed explanation of all these
spectroscopies over a wide doping and energy range. He has shown that the relevant
magnetic fluctuations are strong enough to provide the pairing in these materials, and
lead to the dominant competing phase for electron-doped cuprates. Quite recently he has
developed a general technique for exploring competing magnetic and charge-ordered phases
in these materials, and has found a promissing candidate for the phase seen in STM
studies. These results provide an extension of his earlier work studying nanoscale phase
separation and other instabilities associated with peaks in the density of states, due to
the proximity of a saddle point van Hove singularity to the Fermi level in these
cuprates. Professor Markiewicz's pre-cuprate research involved anomalous electronic
states in predominantly two-dimensional systems. This work included studies of
electron-hole droplets in germanium; localization, interaction, and quenching of
superconductivity in ultrathin metal films; and the crossover to two-dimensional electron
gases in intercalated graphites as a function of magnetic field. 

# Articles

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##### Bulk Fermi surface and momentum density in heavily doped La₂₋ₓSrₓCuO₄ using high-resolution Compton scattering and positron annihilation spectroscopies (with W. Al-Sawai, B. Barbiellini, Y. Sakurai, M. Itou, P. E. Mijnarends, S. Kaprzyk, S. Wakimoto, M. Fujita, S. Basak, H. Lin, Yung Jui Wang, S. W. H. Eijt, H. Schut, K. Yamada, and A. Bansil), Physics Faculty Publications (2012)

We have observed the bulk Fermi surface (FS) in an overdoped (x=0.3) single crystal of...

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##### Fermi-surface topology and low-lying electronic structure of the iron-based superconductor Ca₁₀(Pt₃As₈)(Fe₂As₂)₅ (with Madhab Neupane, Chang Liu, Su-Yang Xu, Yung-Jui Wang, Ni Ni, J. M. Allred, N. Alidoust, Hsin Lin, A. Bansil, R. J. Cava, and M. Z. Hasan), Physics Faculty Publications (2012)

We report a study of low-energy electronic structure and Fermi surface topology for the recently...

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##### Reconstructing the bulk Fermi surface and superconducting gap properties from neutron scattering experiments (with Tanmoy Das and A. Bansil), Physics Faculty Publications (2012)

We develop an analytical tool to extract bulk electronic properties of unconventional superconductors from inelastic...

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##### Coexisting pseudogap, charge-transfer-gap, and Mott-gap energy scales in the resonant inelastic x-ray scattering spectra of electron-doped cuprate superconductors (with Susmita Basak, Tanmoy Das, Hsin Lin, M. z. Hasan, and A. Bansil), Physics Faculty Publications (2012)

We present a computation of Cu K-edge resonant inelastic x-ray scattering (RIXS) spectra for electron-doped...

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##### effect of orbital symmetry of the tip on scanning tunneling spectra of Bi₂Sr₂CaCu₂O₈+δ (with Ilpo Suominen, Jouko Nieminen, and A. Bansil), Physics Faculty Publications (2011)

We discuss how variations in the scanning tunneling microscope (STM) tip, whether unintentional or intentional,...

# Preprints

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##### Emergence of non-Fermi-liquid behavior due to Fermi surface reconstruction in the underdoped cuprate superconductors (with Tanmoy Das and A. Bansil), Physics Faculty Publications (2010)

We present an intermediate coupling scenario together with a model analytic solution where the non-Fermi-liquid...

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##### Competing order scenario of two-gap behavior in hole-doped cuprates (with Tanmoy Das and A. Bansil), Physics Faculty Publications (2008)

Angle-dependent studies of the gap function provide evidence for the coexistence of two distinct gaps...

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##### Dispersion anomalies induced by the low-energy plasmon in the cuprates (with A. Bansil), Physics Faculty Publications (2007)

We discuss the characteristic effects of the electron plasmon interaction resulting from the ~ 1...

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##### Effect of hole doping on the electronic structure of Tl2201 (with S. Sahrakorpi, Hsin Lin, and A. Bansil), Physics Faculty Publications (2007)

We discuss doping dependencies of the electronic structure and Fermi surface of the monolayer Tl$_{2-x}$Cu$_x$Ba$_2$CuO$_{6+\delta}$...

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