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Instruments / Technical Area	Publication Details	Published
I05-ARPES	Uniaxial strain-induced phase transition in the 2D topological semimetal IrTe2 Christopher W. Nicholson , Maxime Rumo , Aki Pulkkinen , Geoffroy Kremer , Björn Salzmann , Marie-Laure Mottas , Baptiste Hildebrand , Thomas Jaouen , Timur K. Kim , Saumya Mukherjee , Keyuan Ma , Matthias Muntwiler , Fabian O. Von Rohr , Cephise Cacho , Claude Monney Communications Materials 2 DOI: 10.1038/s43246-021-00130-5 Diamond Proposal Number(s): [24880] Open Access Show Abstract ▼ Abstract: Strain is ubiquitous in solid-state materials, but despite its fundamental importance and technological relevance, leveraging externally applied strain to gain control over material properties is still in its infancy. In particular, strain control over the diverse phase transitions and topological states in two-dimensional transition metal dichalcogenides remains an open challenge. Here, we exploit uniaxial strain to stabilize the long-debated structural ground state of the 2D topological semimetal IrTe2, which is hidden in unstrained samples. Combined angle-resolved photoemission spectroscopy and scanning tunneling microscopy data reveal the strain-stabilized phase has a 6 × 1 periodicity and undergoes a Lifshitz transition, granting unprecedented spectroscopic access to previously inaccessible type-II topological Dirac states that dominate the modified inter-layer hopping. Supported by density functional theory calculations, we show that strain induces an Ir to Te charge transfer resulting in strongly weakened inter-layer Te bonds and a reshaped energetic landscape favoring the 6×1 phase. Our results highlight the potential to exploit strain-engineered properties in layered materials, particularly in the context of tuning inter-layer behavior.	Mar 2021
I05-ARPES	Dimensional crossover in a charge density wave material probed by angle-resolved photoemission spectroscopy C. W. Nicholson , C. Berthod , M. Puppin , H. Berger , M. Wolf , M. Hoesch , C. Monney Physical Review Letters 118 DOI: 10.1103/PhysRevLett.118.206401 Diamond Proposal Number(s): [10322] Show Abstract ▼ Abstract: High-resolution angle-resolved photoemission spectroscopy data reveal evidence of a crossover from one-dimensional (1D) to three-dimensional (3D) behavior in the prototypical charge density wave (CDW) material NbSe3. In the low-temperature 3D regime, gaps in the electronic structure are observed due to two incommensurate CDWs, in agreement with x-ray diffraction and electronic-structure calculations. At higher temperatures we observe a spectral weight depletion that approaches the power-law behavior expected in one dimension. From the warping of the quasi-1D Fermi surface at low temperatures, we extract the energy scale of the dimensional crossover. This is corroborated by a detailed analysis of the density of states, which reveals a change in dimensional behavior dependent on binding energy. Our results offer an important insight into the dimensionality of excitations in quasi-1D materials.	May 2017
I05-ARPES	Multiband one-dimensional electronic structure and spectroscopic signature of tomonaga-luttinger liquid behavior in K2Cr3As3 Matthew D. Watson , Yu Feng , Christopher Nicholson , Claude Monney , Jonathon Riley , Hideaki Iwasawa , Keith Refson , Vincent Sacksteder , Devashibhai Adroja , Jun Zhao , Moritz Hoesch Physical Review Letters 118, 097002 DOI: 10.1103/PhysRevLett.118.097002 Diamond Proposal Number(s): [13797, 14572] Open Access Show Abstract ▼ Abstract: We present angle-resolved photoemission spectroscopy measurements of the quasi-one-dimensional superconductor K2Cr3As3. We find that the Fermi surface contains two Fermi surface sheets, with linearly dispersing bands not displaying any significant band renormalizations. The one-dimensional band dispersions display a suppression of spectral intensity approaching the Fermi level according to a linear power law, over an energy range of ∼200 meV. This is interpreted as a signature of Tomonoga-Luttinger liquid physics, which provides a new perspective on the possibly unconventional superconductivity in this family of compounds.	Mar 2017

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