Nematic order and the superconducting gap in FeSe. Matt Watson The nematic phase of FeSe. Bogoliubov ARPES: schematic Fermi surfaces of FeSe – 3D.

can be used to simulate several experimental quantities like e.g. ARPES and MgB2 and H-MgB2 monolayers, heterostructures like FeSe/SrTiO3, high-Tc

Direct evidence is needed to pin down their magnetic nature. Domain structure of FeSe. (a) Schematic of the experiment. Red and blue stripes represent domains with 90 • -rotated orthorhombic axes.

Arpes fese

When the carrier concentration increases, the spectral We report results on epitaxial FeSe thin films grown by pulsed laser deposition (PLD) on CaF2 (001) substrates as obtained by exploiting the advantages of an all-in-situ ultra-high vacuum (UHV) laboratory allowing for direct high-resolution surface analysis by scanning tunnelling microscopy (STM), synchrotron radiation X-ray photoelectron spectroscopy (XPS) and angle-resolved photoemission spectroscopy (ARPES) on fresh surfaces. (a) ARPES intensity map at E F as a function of the two-dimensional wave vector measured in the nematic phase (T = 30 K) for strain-free bulk FeSe (T c ∼ 8 K). The intensity was obtained by integrating the spectral intensity within ± 10 meV with respect to E F . Here we present the influence of different STO surface terminations and photon energy dependent ARPES results which help to clarify the role of the substrate in the monolayer FeSe system. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. 2017-10-23 · We report high resolution angle-resolved photo-emission spectroscopy (ARPES) measurements of detwinned FeSe single crystals. The application of a mechanical strain is used to promote the volume fraction of one of the orthorhombic domains in the sample, which we estimate to be detwinned. The observation of replica bands in single-unit-cell FeSe on SrTiO3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) has led to the conjecture that the coupling between FeSe ARPES: schematic Fermi surfaces of FeSe –3D Tetragonal phase: smaller pockets and band renormalisations.

For example, ARPES measurements of FeSe give an exclusive opportunity to investigate the electronic structure in nematic phase without magnetic order.

(a) ARPES intensity map at E F as a function of the two-dimensional wave vector measured in the nematic phase (T = 30 K) for strain-free bulk FeSe (T c ∼ 8 K). The intensity was obtained by integrating the spectral intensity within ± 10 meV with respect to E F . Here we present the influence of different STO surface terminations and photon energy dependent ARPES results which help to clarify the role of the substrate in the monolayer FeSe system. This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division under contract DE-AC02-76SF00515. 2017-10-23 · We report high resolution angle-resolved photo-emission spectroscopy (ARPES) measurements of detwinned FeSe single crystals.

Abstract: We report high resolution ARPES measurements of detwinned FeSe single crystals. The application of a mechanical strain is used to promote the volume fraction of one of the orthorhombic domains in the sample, which we estimate to be 80$\%$ detwinned.

Bogoliubov ARPES: schematic Fermi surfaces of FeSe – 3D. For example, ARPES measurements of FeSe give an exclusive opportunity to investigate the electronic structure in nematic phase without magnetic order. 1 Dec 2020 1 Angle-resolved photoemission spectroscopy (ARPES) measurements on twinned and detwinned FeSe. a Schematic representation of the piezo Bulk FeSe Fermi Surface: Density-Functional Theory vs ARPES. Density Functional Theory in the nonmagnetic phase. ARPES.

The application of a mechanical strain is used to promote the volume fraction of one of the orthorhombic domains in the sample, which we estimate to be 80$\%$ detwinned.
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Although ARPES measurements indicated a the distinct pseudogap-like reduction in DOS in the hole pocket above $T_{\text{c}}$, 116) no discernible reduction in DOS was observed in STS measurements. 142) The evolutions of the BCS–BEC crossover behavior in FeSe $_{1-x}$ S x again suggest that a multiband system exhibits a unique feature that is absent in a single-band system.

This indicates remarkable complexity and new physics in the “overdoped” region. FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics.
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Den elektroniska strukturen av FeSe-filmer med enstaka lager på SrTiO 3 Detaljerad jämförelse av experimentella ARPES-data 10 för enkelskikt FeSe / STO

FeSe is a fascinating superconducting material at the frontier of research in condensed matter physics. Here, we provide an overview of the current understanding of the electronic structure of FeSe, focusing in particular on its low-energy electronic structure as determined from angle-resolved photoemission spectroscopy, quantum oscillations, and magnetotransport measurements of single-crystal in bulk FeSe samples [6]. In this wide temperature range, the system shows a marked electron nematicity in transport [7].

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the low temperature Fermi surface of FeSe as experimentally determined by ARPES consists of one ellipti-cal hole pocket and one orthogonally-oriented peanut-shaped electron pocket. Our measurements clarify the long-standing controversies over the interpretation of ARPES measurements of FeSe. INTRODUCTION

ARPES. The difference suggests that the. We present the results of detailed first principle electronic band structure calculations for these systems together with comparison with some experimental ARPES FULL TEXT Abstract: The observation of replica bands in single-unit-cell FeSe on SrTiO 3 (STO)(001) by angle-resolved photoemission spectroscopy (ARPES) Angle-resolved photoemission spectroscopy (ARPES) is frequently used to to simulate ARPES measurements of various materials — such as FeSe, CoSe, Abstract—Electronic spectra of typical single FeSe layer superconductor—FeSe monolayer film on SrTiO3 substrate (FeSe/STO) obtained from ARPES data The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system.