A5045308076- Physics of Superconductivity and Magnetism
- Topological Materials and Phenomena
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Condensed Matter Physics
- 2D Materials and Applications
- Quantum, superfluid, helium dynamics
- Graphene research and applications
- Industrial Vision Systems and Defect Detection
- Quantum and electron transport phenomena
- Advanced Optical Sensing Technologies
- Thin-Film Transistor Technologies
- Laser-Matter Interactions and Applications
- Magnetic properties of thin films
- Inorganic Fluorides and Related Compounds
- Advanced X-ray Imaging Techniques
- Boron and Carbon Nanomaterials Research
- Advanced Chemical Physics Studies
- Photocathodes and Microchannel Plates
- MXene and MAX Phase Materials
- Optical Coatings and Gratings
- Electronic and Structural Properties of Oxides
- Theoretical and Computational Physics
- High-pressure geophysics and materials
KTH Royal Institute of Technology
2021-2024
2D materials provide a rich platform to study novel physical phenomena arising from quantum confinement of charge carriers. Many these are discovered by surface sensitive techniques, such as photoemission spectroscopy, that work in ultra-high vacuum (UHV). Success experimental studies materials, however, inherently relies on producing adsorbate-free, large-area, high-quality samples. The method yields highest quality is mechanical exfoliation bulk-grown However, this technique traditionally...
Abstract Condensed matter physics has often provided a platform for investigating the interplay between particles and fields in cases that have not been observed high-energy physics. Here, using angle-resolved photoemission spectroscopy, we provide an example of this by visualizing electronic structure noncentrosymmetric magnetic Weyl semimetal candidate NdAlSi both paramagnetic ferrimagnetic states. We observe surface Fermi arcs bulk fermion dispersion as well emergence new fermions state....
Materials with a kagome lattice structure display wealth of intriguing magnetic properties due to their geometric frustration and intrinsically flat band structure. Recently, topological superconducting states have also been observed in systems. The may host ``breathing'' mode that leads charge density wave (CDW) states, if there is strong electron-phonon coupling, electron-electron interaction, or external excitation the material. This can give rise candidate distortions such as star David...
Here we present a high repetition rate, narrow band-width, extreme ultraviolet (XUV) photon source for time- and angle-resolved photoemission spectroscopy (tr-ARPES). The band width pulses $\Delta E=9, 14, 18$ meV energies $h\nu=10.8, 18.1, 25.3$ eV are generated through High Harmonic Generation (HHG) using ultra-violet (UV) drive with relatively long pulse lengths (461 fs). HHG setup employs an annuluar beam in tight focusing geometry at rate of 250 kHz. Photon energy selection is provided...
In the underdoped n-type cuprate Nd
In contrast to hole-doped cuprates, electron-doped cuprates consistently exhibit strong antiferromagnetic correlations with a commensurate ({\pi}, {\pi}) ordering wave vector, leading the prevalent belief that spin fluctuations mediate Cooper pairing in these unconventional superconductors. However, early investigations produced two paradoxical findings: while create largest pseudogap at "hot spots" momentum space, Raman scattering and angle-resolved photoemission spectroscopy measurements...
Ultrafast light sources have become an indispensable tool to access and understand transient phenomenon in material science. However, a simple easy-to-implement method for harmonic selection, with high transmission efficiency pulse duration conservation, is still challenge. Here we showcase compare two approaches selecting the desired from generation source while achieving above goals. The first approach combination of extreme ultraviolet spherical mirrors filters second uses...
The study of interaction between electromagnetism and elementary particles is a long-standing topic in physics. Likewise, the connection particle physics emergent phenomena condensed matter recurring theme has often provided platform for investigating interplay fields cases that have not been observed high-energy physics, so far. Here, using angle-resolved photoemission spectroscopy, we provide new example this by visualizing electronic structure noncentrosymmetric magnetic Weyl semimetal...
Spin- and charge-lattice interactions are potential key factors in the microscopic mechanism of high-temperature superconductivity cuprates. Although both can dramatically shape low-energy electronic structure, their phenomenological roles usually investigated independently. Employing angle-resolved photoemission spectroscopy, we reveal spectroscopic fingerprint short-range antiferromagnetic order conjunction with enhanced electron-phonon interaction electron-doped cuprate superconductor...
Abstract The study of interaction between electromagnetism and elementary particles is a long-standing topic in physics. Likewise, the connection particle physics emergent phenomena condensed matter recurring theme has often provided platform for investigating interplay fields cases that have not been observed high-energy physics, so far. Here, using angle-resolved photoemission spectroscopy, we provide new example this by visualizing electronic structure noncentrosymmetric magnetic Weyl...
In the underdoped n-type cuprate Nd2-xCexCuO4, long-ranged antiferromagnetic order reconstructs Fermi surface, resulting in a putative metal with small pockets. Using angle-resolved photoemission spectroscopy, we observe an anomalous energy gap, of magnitude smaller than wide range regime and smoothly connecting to superconducting gap at optimal doping. After carefully considering all known ordering tendencies tandem phase diagram, hypothesize that normal state cuprates originates from...
The success in studying 2D materials inherently relies on producing samples of large area, and high quality enough for the experimental conditions. Because their nature surface sensitive techniques such as photoemission spectroscopy , tunneling microscopy electron diffraction, that work ultra vacuum (UHV) environment are prime have been employed with great unveiling new properties but it requires to be free adsorbates. technique most easily readily yields 2dmaterials highest is indubitably...
Ultrafast light sources have become an indispensable tool to access and understand transient phenomenon in material science. However, a simple easy-to-implement method for harmonic selection, with high transmission efficiency pulse duration conservation, is still challenge. Here we showcase compare two approaches selecting the desired from generation source while achieving above goals. The first approach combination of extreme ultraviolet spherical mirrors filters second uses...
Abstract The recently discovered AV 3 Sb 5 (A=K, Rb, Cs) family, possessing V kagome nets, has received considerable attention due to the topological electronic structure and intriguing correlated phenomena, including an exotic charge density wave (CDW) superconductivity. Detailed studies are essential unravel characteristics origin of CDW as well its interplay with Here, we present angle-resolved photoemission spectroscopy (ARPES) measurements for CsV at multiple temperatures photon...