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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Observation of inverted band structure in the topological Dirac semimetal candidate CaAuAs Kosuke Nakayama , Zhiwei Wang , Daichi Takane , Seigo Souma , Yuya Kubota , Yuki Nakata , Cephise Cacho , Timur Kim , Sandy Adhitia Ekahana , Ming Shi , Miho Kitamura , Koji Horiba , Hiroshi Kumigashira , Takashi Takahashi , Yoichi Ando , Takafumi Sato Physical Review B 102 DOI: 10.1103/PhysRevB.102.041104 Diamond Proposal Number(s): [23799] Show Abstract ▼ Abstract: We have performed high-resolution angle-resolved photoemission spectroscopy of the ternary pnictide CaAuAs, which is predicted to be a three-dimensional topological Dirac semimetal (TDS). By accurately determining the bulk-band structure, we have revealed the coexistence of three-dimensional and quasi-two-dimensional Fermi surfaces with dominant hole carriers. The band structure around the Brillouin-zone center is characterized by an energy overlap between the hole and electron pockets, in excellent agreement with first-principles band-structure calculations. This indicates the occurrence of bulk-band inversion, supporting the TDS state in CaAuAs. Because of the high tunability in the chemical composition besides the TDS nature, CaAuAs provides a precious opportunity for investigating the quantum phase transition from TDS to other exotic topological phases.	Jul 2020
I16-Materials and Magnetism	Structural involvement in the melting of the charge density wave in 1T - TiSe2 Max Burian , Michael Porer , Jose R. L. Mardegan , Vincent Esposito , Sergii Parchenko , Bulat Burganov , Namrata Gurung , Mahesh Ramakrishnan , Valerio Scagnoli , Hiroki Ueda , Sonia Francoual , Federica Fabrizi , Yoshikazu Tanaka , Tadashi Togashi , Yuya Kubota , Makina Yabashi , Kai Rossnagel , Steven L. Johnson , Urs Staub Physical Review Research 3 DOI: 10.1103/PhysRevResearch.3.013128 Diamond Proposal Number(s): [15742] Open Access Show Abstract ▼ Abstract: In this work, we use ultrafast pump-probe nonresonant and resonant x-ray diffraction to track the periodic lattice distortion and the electronic charge density wave in 1 T − TiSe 2 upon optical excitation. We observe a fluence regime in which the periodic lattice deformation is strongly suppressed but the charge density wave related Se 4 p orbital order remains mostly intact. Complete melting of both structural and electronic order occurs four to five times faster than expected from a purely electronic charge-screening process, strongly suggesting a structurally assisted weakening of excitonic correlations. Our experimental data provide insight on the intricate coupling between structural and electronic order in stabilizing the periodic-lattice-distortion/charge-density-wave state in 1 T − TiSe 2 . The results further show that electron-phonon coupling can lead to different, energy dependent phase-transition pathways in condensed matter systems, opening different possibilities in the conception of nonequilibrium phenomena at the ultrafast scale.	Feb 2021

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