scholarly journals Possibility of an excitonic insulator at the semiconductor-semimetal transition

2006 ◽  
Vol 74 (16) ◽  
Author(s):  
Franz X. Bronold ◽  
Holger Fehske
Keyword(s):  
Excitonic Insulator

scholarly journals Flat-Band-Enabled Triplet Excitonic Insulator in a Diatomic Kagome Lattice

2021 ◽  
Vol 126 (19) ◽  
Author(s):  
Gurjyot Sethi ◽  
Yinong Zhou ◽  
Linghan Zhu ◽  
Li Yang ◽  
Feng Liu
Keyword(s):  
Flat Band ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Excitonic Insulator

scholarly journals Direct observation of excitonic instability in Ta2NiSe5

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Kwangrae Kim ◽  
Hoon Kim ◽  
Jonghwan Kim ◽  
Changil Kwon ◽  
Jun Sung Kim ◽  
...  
Keyword(s):  
Phase Transition ◽  
Direct Observation ◽  
Structural Phase ◽  
Temperature Phase ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Weiss Temperature ◽  
Excitonic Insulator ◽  
Electron Phonon Coupling ◽  
Low Temperature Phase

AbstractCoulomb attraction between electrons and holes in a narrow-gap semiconductor or a semimetal is predicted to lead to an elusive phase of matter dubbed excitonic insulator. However, direct observation of such electronic instability remains extremely rare. Here, we report the observation of incipient divergence in the static excitonic susceptibility of the candidate material Ta2NiSe5 using Raman spectroscopy. Critical fluctuations of the excitonic order parameter give rise to quasi-elastic scattering of B2g symmetry, whose intensity grows inversely with temperature toward the Weiss temperature of TW ≈ 237 K, which is arrested by a structural phase transition driven by an acoustic phonon of the same symmetry at TC = 325 K. Concurrently, a B2g optical phonon becomes heavily damped to the extent that its trace is almost invisible around TC, which manifests a strong electron-phonon coupling that has obscured the identification of the low-temperature phase as an excitonic insulator for more than a decade. Our results unambiguously reveal the electronic origin of the phase transition.

scholarly journals Interacting topological mirror excitonic insulator in one dimension

2020 ◽  
Vol 102 (23) ◽  
Author(s):  
Lun-Hui Hu ◽  
Rui-Xing Zhang ◽  
Fu-Chun Zhang ◽  
Congjun Wu
Keyword(s):  
One Dimension ◽  
Excitonic Insulator

scholarly journals Tunneling-tip-induced collapse of the charge gap in the excitonic insulator Ta2NiSe5

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Qingyu He ◽  
Xinglu Que ◽  
Lihui Zhou ◽  
Masahiko Isobe ◽  
Dennis Huang ◽  
...  
Keyword(s):  
Excitonic Insulator

scholarly journals Strong Coupling Nature of the Excitonic Insulator State in Ta2NiSe5

2018 ◽  
Vol 120 (24) ◽  
Author(s):  
Koudai Sugimoto ◽  
Satoshi Nishimoto ◽  
Tatsuya Kaneko ◽  
Yukinori Ohta
Keyword(s):  
Strong Coupling ◽  
Excitonic Insulator

scholarly journals Prediction of a topological p + ip excitonic insulator with parity anomaly

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Rui Wang ◽  
Onur Erten ◽  
Baigeng Wang ◽  
D. Y. Xing
Keyword(s):  
Excitonic Insulator

scholarly journals Strong interband interaction in the excitonic insulator phase of Ta2NiSe5

2019 ◽  
Vol 99 (7) ◽  
Author(s):  
Jinwon Lee ◽  
Chang-Jong Kang ◽  
Man Jin Eom ◽  
Jun Sung Kim ◽  
Byung Il Min ◽  
...  
Keyword(s):  
Interband Interaction ◽  
Excitonic Insulator
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