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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Bonding states underpinning structural transitions in IrTe2 observed with micro-ARPES C. W. Nicholson , M. D. Watson , A. Pulkkinen , M. Rumo , G. Kremer , K. Y. Ma , F. O. Von Rohr , C. Cacho , C. Monney Physical Review B 110 DOI: 10.1103/PhysRevB.110.205123 Diamond Proposal Number(s): [25906] Open Access Show Abstract ▼ Abstract: Competing interactions in low-dimensional materials can produce nearly degenerate electronic and structural phases. We investigate structural phase transitions in layered IrTe2 for which a number of potential transition mechanisms have been postulated. The spatial coexistence of multiple phases on the micron scale has prevented a detailed analysis of the electronic structure. By exploiting micro-angle-resolved photoemission spectroscopy obtained with synchrotron radiation we extract the electronic structure of the multiple structural phases in IrTe2 in order to address the mechanism underlying the phase transitions. We find direct evidence of lowered energy states that appear in the low-temperature phases, states previously predicted by ab initio calculations and extended here. Our results validate a proposed scenario of bonding and antibonding states as the driver of the phase transitions.	Nov 2024
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

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