TY - JOUR
T1 - Dimensionality reduction and band quantization induced by potassium intercalation in 1T-HfTe2
AU - Nakata, Y.
AU - Sugawara, K.
AU - Chainani, A.
AU - Yamauchi, K.
AU - Nakayama, K.
AU - Souma, S.
AU - Chuang, P. Y.
AU - Cheng, C. M.
AU - Oguchi, T.
AU - Ueno, K.
AU - Takahashi, T.
AU - Sato, T.
N1 - Funding Information:
We thank T. Kato, K. Hori, K. Owada, T. Nakamura, H. Oinuma, K. Shigekawa, and D. Takane for their assistance in the ARPES measurements. We also thank KEK-PF for access to beamline BL28 (Proposal number: 2018S2-001) and NSRRC-TLS for beamline BL21A2. This work was supported by JST-CREST (No.: JPMJCR18T1), MEXT of Japan (Innovative Area “Topological Materials Science” JP15H05853), JSPS (JSPS KAKENHI Nos.: JP17H01139, JP26287071, JP18H01160, JP18H01821, 18K18986, JP25107003, JP25107004, and 18J10038), Grant for Basic Science Research Projects from the Sumitomo Foundation, and Murata Science Foundation. Y.N. acknowledges support from GP-Spin at Tohoku University.
Publisher Copyright:
© 2019 American Physical Society.
PY - 2019/7/10
Y1 - 2019/7/10
N2 - We have performed angle-resolved photoemission spectroscopy on transition-metal dichalcogenide 1T-HfTe2 to elucidate the evolution of electronic states upon potassium (K) deposition. In pristine HfTe2, an in-plane hole pocket and electron pockets are observed at the Brillouin-zone center and corner, respectively, indicating the semimetallic nature of bulk HfTe2, with dispersion perpendicular to the plane. In contrast, the band structure of heavily K-dosed HfTe2 is obviously different from that of bulk and resembles the band structure calculated for monolayer HfTe2. It was also observed that lightly K-dosed HfTe2 is characterized by quantized bands originating from bilayer and trilayer HfTe2, indicative of staging. The results suggest that the dimensionality crossover from 3D (dimensional) to 2D electronic states due to systematic K intercalation takes place via staging in a single sample. The study provides a strategy for controlling the dimensionality and functionality of novel quantum materials.
AB - We have performed angle-resolved photoemission spectroscopy on transition-metal dichalcogenide 1T-HfTe2 to elucidate the evolution of electronic states upon potassium (K) deposition. In pristine HfTe2, an in-plane hole pocket and electron pockets are observed at the Brillouin-zone center and corner, respectively, indicating the semimetallic nature of bulk HfTe2, with dispersion perpendicular to the plane. In contrast, the band structure of heavily K-dosed HfTe2 is obviously different from that of bulk and resembles the band structure calculated for monolayer HfTe2. It was also observed that lightly K-dosed HfTe2 is characterized by quantized bands originating from bilayer and trilayer HfTe2, indicative of staging. The results suggest that the dimensionality crossover from 3D (dimensional) to 2D electronic states due to systematic K intercalation takes place via staging in a single sample. The study provides a strategy for controlling the dimensionality and functionality of novel quantum materials.
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U2 - 10.1103/PhysRevMaterials.3.071001
DO - 10.1103/PhysRevMaterials.3.071001
M3 - Article
AN - SCOPUS:85073653930
SN - 2475-9953
VL - 3
JO - Physical Review Materials
JF - Physical Review Materials
IS - 7
M1 - 071001
ER -