Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite

Z. Zhu, R.D. McDonald, A. Shekhter, B.J. Ramshaw, K.A. Modic, F.F. Balakirev, N. Harrison, Scientific Reports 7 (2017).

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Journal Article | Published | English
Author
Zhu, Z.; McDonald, R. D.; Shekhter, A.; Ramshaw, B. J.; Modic, Kimberly AIST Austria ; Balakirev, F. F.; Harrison, N.
Abstract
The excitonic insulator phase has long been predicted to form in proximity to a band gap opening in the underlying band structure. The character of the pairing is conjectured to crossover from weak (BCS-like) to strong coupling (BEC-like) as the underlying band structure is tuned from the metallic to the insulating side of the gap opening. Here we report the high-magnetic field phase diagram of graphite to exhibit just such a crossover. By way of comprehensive angle-resolved magnetoresistance measurements, we demonstrate that the underlying band gap opening occurs inside the magnetic field-induced phase, paving the way for a systematic study of the BCS-BEC-like crossover by means of conventional condensed matter probes.
Publishing Year
Date Published
2017-05-04
Journal Title
Scientific Reports
Volume
7
Article Number
1733
ISSN
IST-REx-ID

Cite this

Zhu Z, McDonald RD, Shekhter A, et al. Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite. Scientific Reports. 2017;7. doi:10.1038/s41598-017-01693-5
Zhu, Z., McDonald, R. D., Shekhter, A., Ramshaw, B. J., Modic, K. A., Balakirev, F. F., & Harrison, N. (2017). Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite. Scientific Reports. Springer Nature. https://doi.org/10.1038/s41598-017-01693-5
Zhu, Z., R. D. McDonald, A. Shekhter, B. J. Ramshaw, Kimberly A Modic, F. F. Balakirev, and N. Harrison. “Magnetic Field Tuning of an Excitonic Insulator between the Weak and Strong Coupling Regimes in Quantum Limit Graphite.” Scientific Reports. Springer Nature, 2017. https://doi.org/10.1038/s41598-017-01693-5.
Z. Zhu et al., “Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite,” Scientific Reports, vol. 7. Springer Nature, 2017.
Zhu Z, McDonald RD, Shekhter A, Ramshaw BJ, Modic KA, Balakirev FF, Harrison N. 2017. Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite. Scientific Reports. 7, 1733.
Zhu, Z., et al. “Magnetic Field Tuning of an Excitonic Insulator between the Weak and Strong Coupling Regimes in Quantum Limit Graphite.” Scientific Reports, vol. 7, 1733, Springer Nature, 2017, doi:10.1038/s41598-017-01693-5.
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