A. W. Rost
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
A. W. Rost has a total of 7 co-authors. Here are the top co-authors by number of shared publications:
A. V. Boris
Max Planck Institute for Solid State Research, Heisenbergstrsse 1, 70569 Stuttgart, Germany
1 shared publicationB. Keimer
Max Planck Institute for Solid State Research, Heisenbergstrsse 1, 70569 Stuttgart, Germany
1 shared publicationH. Kono
Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
1 shared publication- Hidenori Takagi
Max Planck Institute for Solid State Research, Stuttgart, Germany
1 shared publication T. I. Larkin
Max Planck Institute for Solid State Research, Heisenbergstrsse 1, 70569 Stuttgart, Germany
1 shared publicationT. Takayama
Max Planck Institute for Solid State Research, Heisenbergstrsse 1, 70569 Stuttgart, Germany
1 shared publication
Latest Publications
- Top Cited PapersOpen Access
- 16 February 2017
- Published by Springer Nature in Nature Communications
- Vol. 8 (1) , 14408
Zero-gap semiconductor to excitonic insulator transition in Ta2NiSe5
The excitonic insulator is a long conjectured correlated electron phase of narrow-gap semiconductors and semimetals, driven by weakly screened electron–hole interactions. Having been proposed more than 50 years ago, conclusive experimental evidence for its existence remains elusive. Ta2NiSe5 is a narrow-gap semiconductor with a small one-electron bandgap EG of TC=326 K, a putative excitonic insulator is stabilized. Here we report an optical excitation gap Eop ∼0.16 eV below TC comparable to the estimated exciton binding energy EB. Specific heat measurements show the entropy associated with the transition being consistent with a primarily electronic origin. To further explore this physics, we map the TC–EG phase diagram tuning EG via chemical and physical pressure. The dome-like behaviour around EG∼0 combined with our transport, thermodynamic and optical results are fully consistent with an excitonic insulator phase in Ta2NiSe5.
- 16 February 2017
- Published by Springer Nature in Nature Communications
- Vol. 8 (1) , 14408
Top Cited PapersOpen AccessZero-gap semiconductor to excitonic insulator transition in Ta2NiSe5
The excitonic insulator is a long conjectured correlated electron phase of narrow-gap semiconductors and semimetals, driven by weakly screened electron–hole interactions. Having been proposed more than 50 years ago, conclusive experimental evidence for its existence remains elusive. Ta2NiSe5 is a narrow-gap semiconductor with a small one-electron bandgap EG of TC=326 K, a putative excitonic insulator is stabilized. Here we report an optical excitation gap Eop ∼0.16 eV below TC comparable to the estimated exciton binding energy EB. Specific heat measurements show the entropy associated with the transition being consistent with a primarily electronic origin. To further explore this physics, we map the TC–EG phase diagram tuning EG via chemical and physical pressure. The dome-like behaviour around EG∼0 combined with our transport, thermodynamic and optical results are fully consistent with an excitonic insulator phase in Ta2NiSe5.