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Unambiguous connection between the Fermi surface topology and the pseudogap in BiSrCaCuO
B. Loret, Y. Gallais, M. Cazayous +7
We study the behavior of the pseudogap in overdoped BiSrCaCuO by electronic Raman scattering (ERS) and angle-resolved photoemission spectroscopy (ARPES) on th…
Non-rigid band shift and non-monotonic electronic structure changes upon doping in the normal state of the pnictide high temperature superconductor Ba2(Fe1-xCox)2As2
PPaolo Vilmercati, Sung-Kwan Mo, Alexei Fedorov +8
We report systematic Angle Resolved Photoemission (ARPES) experiments using different photon polarizations and experimental geometries and find that the doping evolution of the nor…
Ytterbium-driven strong enhancement of electron-phonon coupling in graphene
Choongyu Hwang, Duck Young Kim, D. A. Siegel +7
We present high-resolution angle-resolved photoemission spectroscopy study in conjunction with first principles calculations to investigate how the interaction of electrons with ph…
Fully gapped topological surface states in BiSe films induced by a d-wave high-temperature superconductor
Eryin Wang, Hao Ding, Alexei V. Fedorov +17
Topological insulators are a new class of materials, that exhibit robust gapless surface states protected by time-reversal symmetry. The interplay between such symmetry-protected t…
Chemically gated electronic structure of a superconducting doped topological insulator system
L. A. Wray, S. Xu, M. Neupane +4
Angle resolved photoemission spectroscopy is used to observe changes in the electronic structure of bulk-doped topological insulator CuBiSe as additional copper atoms a…
Itinerant electrons, local moments, and magnetic correlations in pnictides high temperature superconductors
P. Vilmercati, A. Fedorov, F. Bondino +11
A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped Ce…
Spin-orbital groundstates of Superconducting doped topological insulators (A Majorana Platform)
L. Andrew Wray, Yuqi Xia, Su-Yang Xu +8
The BiSe class of topological insulators has recently been shown to undergo a superconducting transition upon hole or electron doping (Cu-BiSe with T=3.8$^o…
Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
L. Andrew Wray, Suyang Xu, Yuqi Xia +7
Topological insulators embody a new state of matter characterized entirely by the topological invariants of the bulk electronic structure rather than any form of spontaneously brok…
Evidence for Three-Dimensionality in the Fermi Surface Topology of Layered Electron Doped Ba(Fe1-XCox)2As2 Iron Superconductors
P. Vilmercati, A. Fedorov, I. Vobornik +10
The electronic structure of electron doped iron-arsenide superconductors Ba(Fe1- xCox)2As2 has been measured with Angle Resolved Photoemission Spectroscopy. The data reveal a marke…
Momentum-dependence of Superconducting Gap, strong-coupling dispersion Kink, and tightly bound Cooper pairs in the high-Tc (Sr,Ba)1-x(K,Na)xFe2As2 superconductors
L. Wray, D. Qian, D. Hsieh +13
We present a systematic angle-resolved photoemission spectroscopic study of the high-Tc superconductor class (Sr/Ba){1-x}(K/Na)xFe2As2. By utilizing a photon-energy-modulation cont…
Tightly-bound Cooper pair, quasiparticle kinks and clues on the pairing potential in a high Tc FeAs Superconductor
L. Wray, D. Qian, D. Hsieh +12
We present a systematic photoemission study of the newly discovered high Tc superconductor class (Sr/Ba)1-xKxFe2As2. By utilizing a unique photon energy range and scattering geomet…
Origins of large critical temperature variations in single layer cuprates
A. D. Palczewski, T. Kondo, R. Khasanov +14
We study the electronic structures of two single layer superconducting cuprates, TlBaCuO (Tl2201) and (BiPb)(SrLa)CuO (B…
The Fermi surface of Ba(1-x)K(x)Fe2As2 and its evolution with doping
C. Liu, G. D. Samolyuk, Y. Lee +11
We use angle-resolved photoemission spectroscopy (ARPES) to investigate the electronic properties of the newly discovered iron-arsenic superconductor, Ba(1-x)K(x)Fe2As2 and non-sup…
Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in CaC6
T. Valla, J. Camacho, Z-H. Pan +4
Superconductivity in graphite intercalated compounds has been studied for more than 40 years and it is still not fully understood, despite the recent progress and the discovery of…
The Ground State of the Pseudogap in Cuprate Superconductors
T. Valla, A. V. Fedorov, Jinho Lee +2
We present studies of the electronic structure of La2-xBaxCuO4, a system where the superconductivity is strongly suppressed as static spin and charge orders or "stripes" develop ne…
Universal quasiparticle decoherence in hole- and electron-doped high-Tc cuprates
Z. -H. Pan, P. Richard, A. V. Fedorov +8
We use angle-resolved photoemission to unravel the quasiparticle decoherence process in the high- cuprates. The coherent band is highly renormalized, and the incoherent part m…
High-energy kink in high-temperature superconductors
T. Valla, T. E. Kidd, Z. -H. Pan +4
In conventional metals, electron-phonon coupling, or the phonon-mediated interaction between electrons, has long been known to be the pairing interaction responsible for the superc…
Low-lying quasiparticle states and hidden collective charge instabilities in parent cobaltate superconductors (NaxCoO2)
D. Qian, D. Hsieh, L. Wray +7
We report a state-of-the-art photoemission (ARPES) study of high quality single crystals of the NaxCoO2 series focusing on the fine details of the low-energy states. The Fermi velo…
Unusual photoemission resonances of oxygen-dopant induced states in BiSrCaCuO
P. Richard, Z. -H. Pan, M. Neupane +7
We have performed an angular-resolved photoemission study of underdoped, optimally doped and overdoped BiSrCaCuO samples using a wide photon energy range (15…
Laser ARPES, the sudden approximation, and quasiparticle-like peaks in Bi2Sr2CaCu2O8+delta
J. D. Koralek, J. F. Douglas, N. C. Plumb +9
A new low photon energy regime of angle resolved photoemission spectroscopy is accessed with lasers and used to study the superconductor Bi2Sr2CaCu2O8+delta. The low energy increas…
An intrinsic peak-dip-hump and strong coupling effects in ARPES data near
A. D. Gromko, Y. -D. Chuang, A. V. Fedorov +5
A well-known peak-dip-hump structure exists near in superconducting state ARPES spectra of (Bi2212). Here we report results on optimal and ov…
Quasiparticle Liquid in the Highly Overdoped Bi2212
Z. Yusof, B. O. Wells, T. Valla +6
We present results from the study of a highly overdoped (OD) Bi2212 with a K using high resolution angle-resolved photoemission spectroscopy. The temperature dependent sp…
On the Doping and Temperature Dependence of the Mass Enhancement Observed in the Cuprate Bi2212
P. D. Johnson, T. Valla, A. Fedorov +9
High-resolution photoemission is used to study the electronic structure of the cuprate superconductor, Bi2212, as a function of hole doping and temperature. A kink observed in the…