ARPES on FeSe /SrTiO 3 Films and Silicene Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China 5th Swiss-China Workshop 2015/05/04-05, Brugg, Switzerland . Laser ARPES Group at the Institute of Physics, CAS, Beijing

ARPES on FeSe /SrTiO 3 Films and Silicene Xingjiang ZHOU (周兴江) National Lab for Superconductivity Institute of Physics, Chinese Academy of Sciences, Beijing, China 5th Swiss-China Workshop 2015/05/04-05, Brugg, Switzerland

toemission (ARPES) measurements on the single-layer FeSe/ SrTiO 3 films at various carrier concentrations. At a very low carrier concentration, the spectral weight near the Fermi level is suppressed, accompanied with the opening of an insulating energy gap. 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.

Arpes fese

FeSe PLD growth protocols were ﬁne-tuned by optimizing target-to-substrate distance d and ablation frequency, atomically ﬂat terraces with unit-cell step heights are obtained, overcoming the spiral morphology often observed by others. 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 … 2017-03-01 2017-05-05 2019-10-02 2017-06-09 Enabled by an angle-resolved photoemission spectroscopy beamline with a highly focused beam spot (nano-ARPES), we identify clear stripelike orthorhombic domains in FeSe with a length scale of 2012-07-03 We have revealed the existence of a novel electronic state in an highly unconventional multiband superconductor, FeSe, from the evolution of its electronic structure from the high-temperature tetragonal phase into the electronic nematic phase using angle resolved photoemission spectroscopy (ARPES). Bulk FeSe is an iron-based superconductor that has a maximum Tc of 8K. Surprisingly, the Tc of a single layer of FeSe film grown epitaxially on the SrTiO 3 substrate is enhanced to over 55K. We perform in-situ synchrotron-based MBE/ARPES experiment to understand how the transition temperature can be enhanced from the bulk superconducting transition temperature (Tc) of 8K at this 1UC FeSe/STO … 2017-02-10 Combining Angle resolved photoelectron spectroscopy (ARPES) and a μ-focused Laser, we have performed scanning ARPES microscopy measurements of the domain population within the nematic phase of FeSe single crystals.We are able to demonstrate a variation of the domain population density on a scale of a few 10 μm while constraining the upper limit of the single domain size to less than 5 μm. 2014-12-30 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.

In fact, high resolution measurements of the electronic structure of FeSe by ARPES at beamline I05 at Diamond have previously made several important experimental contributions to the understanding

While the full structure of the electron pockets consisting of two crossed ellipses may be observed in the tetragonal phase at temperatures above 90 2020-03-03 2018-06-05 2015-07-15 In this Nature paper, T. Shimojima (RIKEN CEMS) et al. use time-resolved ARPES to visualize the ultrafast dynamics of electronic nematicity in FeSe.

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.

4.2.1 Penetration depth. 4.2.2 ARPES. 4.2.3 Quasiparticle interference (QPI). 4.2.4 Quantum-limit vortex Here we show that the electron-phonon coupling strength in FeSe can be angle resolved photoemission spectroscopy (ARPES) results which reveal an The first ARPES study on single-layer FeSe/STO films has provided key insights into the electronic origin of superconductivity in this system.

use time-resolved ARPES to visualize Experimental setup----OMBE+MBE+ARPES. 1. Heterostructure Design and in- situ ARPES study. 2. Summary.
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The advantage of the nano-ARPES technique for the study of ReS 2 is that (b) ARPES spectra taken along the Γ−M direction on a twinned FeSe. (c),(d) ARPES spectra taken on detwinned FeSe along the Γ−M X and Γ−M Y directions, respectively.

While the full structure of the electron pockets consisting of two crossed ellipses may be observed in the tetragonal phase at temperatures above 90 Direct-ARPES and STM Investigation of FeSe Thin Film Growth by Nd:YAG Laser Sandeep Kumar Chaluvadi 1, Debashis Mondal 1,2, Chiara Bigi 1,3, Jun Fujii 1, Rajdeep Adhikari 4, Regina Ciancio 1, Alberta Bonanni 4, Giancarlo Panaccione 1, Giorgio Rossi 1,3, Ivana Vobornik 1,* and Pasquale Orgiani 1,5,* Citation: Chaluvadi , S.K.; Mondal, As it is commonly observed from ARPES on the Fe-based superconductors that the gap closes at the superconducting temperature 17,14, Fig. 3c suggests that the single-layer FeSe sample, we measured ARPES has provided suggestions that the N phase of the single-layer FeSe/SrTiO 3 film may be magnetic and the low-temperature form of the multi-layer FeSe/SrTiO 3 films may be in the spin-density-wave state .
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(c),(d) ARPES spectra taken on detwinned FeSe along the Γ−M X and Γ−M Y directions, respectively. (e),(f) EDCs taken at the momentum pointed to by arrows in (b)–(d). All measurements are taken with 70 eV photons under odd polarization with respect to the cut direction.