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Showing 1 to 20 of 27 for “"ARPES"”.
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Angle-Resolved Photoelectron Spectroscopy Studies of the Many-Body Effects in the Electronic Structure of High-Tc Cuprates
… glue. Among the meth-ods that are to be unified, ARPES plays a central role. The reason for this is that it gives access to the single-particle excitation spectrum of the material as a function of both momentum and energy with very high resolution. Other experimental techniques, such as inelastic …
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Die Fermifläche des Kupratsupraleiters Bi2Sr2CaCu2O8+[delta] : Ergebnisse der winkelaufgelösten Photoemissionsspektroskopie
… winkelaufgelöster Photoemissionsspektroskopie (ARPES) durchgeführt, wobei die hohe Auflösung in Energie und Impuls recht genaue Rückschlüsse auf die Spektralfunktion und die Übergangs-Matrixelemente erlaubt. Die wichtigsten experimentellen Ergebnisse sind: 1) Hochaufgelöste …
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Angle-resolved photoemission studies of thin-film topological materials
… of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations. We have studied the electronic structure of Bi2Te3 films using ARPES with circularly-polarized lights. Our ARPES results show a thickness-dependent electronic structure of Bi2Te3 films. In addition, we have …
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Nonlinear optical and photoemission spectroscopies of quantum materials
… angle-resolved photoemission spectroscopy (tr-ARPES) based on high harmonic generation can offer a unique pathway toward studying quantum materials in the context of broken symmetries and nonequilibrium electronic structure, respectively. In particular, we measured the hidden magnetism buried …
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Angle-resolved photoemission and first-principles studies of topological semimetals and heterostructures
… angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations are used to study the electronic properties of topological semimetals and topological heterostructures. The topological heterostructures are prepared using molecular beam epitaxy (MBE) and characterized by …
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Spectral properties of strongly correlated electron systems
… of angular resolved photoemission spectroscopy (ARPES) allows us to fix a consistent parameter set for the one-band Hubbard model with an additional hopping parameter t' along the lattice diagonal. The doping dependence of the single-particle excitations is studied within the t-t-U Hubbard model …
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Angle-resolved photoemission studies of topological thin films and superconducting heterostructures
… Angle-resolved photoemission spectroscopy (ARPES) is employed to quantify the electronic band structure of all topological films and associated heterostructures. Systems fabricated during this dissertation research include the topological insulators (TIs) Bi2Te3 and Bi2Se3, the …
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Angle-Resolved Photoemission Studies on the Many-Body Effects of High-Temperature Superconductor: Bi-2212
… a stable photon-energy helium lamp–based ARPES (angle-resolved photoemission spectroscopy) system with high energy resolution to extract detailed single-particle spectral functions in Bi-2212. Using these spectral functions, we reconstructed both the non-interacting and interacting spin …
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Femtosecond spectroscopy of coherent phenomena in quantum materials : a dissertation
… and time and angle resolved photoemission (Tr-ARPES). One approach is to perturb the system gently (low pump intensity) to preserve the underlying order. Transient reflectivity experiments are done in this weak perturbation regime to study the following phenomena: (1) Collective excitations …
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Funkcionalizace grafenu pomocí interkalace a molekulárního dopování
… úhlově rozlišená fotoelektronová spektroskopie (ARPES) a rastrovací tunelová mikroskopie (STM). Tyto metody umožnily podrobnou analýzu jak samouspořádání molekul, tak výsledného efektu dopování.
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The role of inter-plane interaction in the electronic structure of high Tc cuprates
… the angle-resolved photoemission spectroscopy (ARPES), which is a leading technique in the experimental investigation of the single particle excitations in solids. The results presented in this work indicate a very different origin for the observed complex spectra lineshape. Specifically, the …
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Investigation of renormalization effects in high temperature cuprate superconductors
… Cu-O plane changes renormalization features in ARPES spectra both in nodal and antinodal parts of the Brillouin zone. The smearing of the dip in the in the spectral line shape measured at (pi; 0) point can be well explained by coupling of electrons to the magnetic resonance mode. The effect of …
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Struktur und elektronische Eigenschaften geordneter binärer Dünnschichtverbindungen Seltener Erden mit Übergangsmetallen
… mittels winkelaufgelöster Photoemission (ARPES), teilweise unter Nutzung von Synchrotronstrahlung von BESSY. Schwerpunkt bildete dabei das Verhalten der Valenzbänder als Funktion von Struktur und Zusammensetzung der Dünnschichten unter besonderer Berücksichtigung von Oberflächenphänomenen. …
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Investigation of Iron-Based and Topological Superconductors via Point-Contact Spectroscopy
… angle-resolved photoemission spectroscopy (ARPES), and Raman spectroscopy, which confirm a lack of nodes in the order parameter and the presence of a gap of magnitude 3 meV. Conductivity spectra were also measured for the half-Heusler materials YPtBi and LuPdBi using the soft point contact …
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Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
… on angle-resolved photoemission spectroscopy (ARPES), infrared conductivity, diamagnetism, and lattice symmetry breaking. The material presented here is based on Ref. [38, 41, 40]. Ref. [39] is not discussed in this thesis but was completed during my time at MIT.
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Angle-resolved photoemission and first-principles studies of topological thin films
… of angle-resolved photoemission spectroscopy (ARPES) and first principles calculation is used to examine the electronic properties of topological thin films and 2D electronic systems with large spin-orbit splitting. The topological thin films are prepared in situ by molecular beam epitaxy (MBE) …
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New features in the phase diagrams of the cuprate high-Tc superconductors mapped using strong magnetic fields
… boundary from electronic specific heat and ARPES.
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High Pressure Quantum Oscillation Study of BiTeI and Bi2Te3
… comparison against band structure from published ARPES results, it is deduced that the higher frequency oscillation corresponds to the surface state of $\text{Bi}_2\text{Te}_3$. Non-linear behaviour in the Hall measurement also suggests the presence of multiple bands, and a two-band model with …
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Coherent light-matter interactions in monolayer transition-metal dichalcogenides
… angle-resolved photoemission spectroscopy (TR-ARPES) on WSe2 and WTe 2 Hybridizing the electronic valleys with light allows us to optically tune their energy levels in a controllable valley-selective manner. In particular, by using off-resonance circularly polarized light at small detuning, we …
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Experimental consequences of mottness in high-temperature copper-oxide superconductors
… observed in the electron dispersion measured by ARPES (Angle Resolved Photoemission Spectroscopy). In Chapter 5, the origin of the mid-IR band seen in optics experiments is studied. In Chapter 6, we study the universal sign change of the thermopower in the vicinity of optimal doping in the …
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