TY - JOUR KW - spectroscopy KW - Condensed Matter Physics KW - Instrumentation KW - Radiation AU - Yingchao Zhang AU - Xun Shi AU - Mengxue Guan AU - Wenjing You AU - Yigui Zhong AU - Tika Kafle AU - Yaobo Huang AU - Hong Ding AU - Michael Bauer AU - Kai Rossnagel AU - Sheng Meng AU - Henry Kapteyn AU - Margaret Murnane AB -

Charge density wave (CDW) order is an emergent quantum phase that is characterized by periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here, we uncover a novel inverted CDW state by using a femtosecond laser to coherently reverse the star-of-David lattice distortion in 1T-TaSe2. We track the signature of this novel CDW state using time- and angle-resolved photoemission spectroscopy and the time-dependent density functional theory to validate that it is associated with a unique lattice and charge arrangement never before realized. The dynamic electronic structure further reveals its novel properties that are characterized by an increased density of states near the Fermi level, high metallicity, and altered electron–phonon couplings. Our results demonstrate how ultrafast lasers can be used to create unique states in materials by manipulating charge-lattice orders and couplings.

BT - Structural Dynamics DA - 2022-01 DO - 10.1063/4.0000132 IS - 1 N2 -

Charge density wave (CDW) order is an emergent quantum phase that is characterized by periodic lattice distortion and charge density modulation, often present near superconducting transitions. Here, we uncover a novel inverted CDW state by using a femtosecond laser to coherently reverse the star-of-David lattice distortion in 1T-TaSe2. We track the signature of this novel CDW state using time- and angle-resolved photoemission spectroscopy and the time-dependent density functional theory to validate that it is associated with a unique lattice and charge arrangement never before realized. The dynamic electronic structure further reveals its novel properties that are characterized by an increased density of states near the Fermi level, high metallicity, and altered electron–phonon couplings. Our results demonstrate how ultrafast lasers can be used to create unique states in materials by manipulating charge-lattice orders and couplings.

PB - AIP Publishing PY - 2022 EP - 014501 T2 - Structural Dynamics TI - Creation of a novel inverted charge density wave state VL - 9 SN - 2329-7778 ER -