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

Scientific Reports
Z ZhuN Harrison

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.

References

Dec 12, 2001·Physical Review Letters·D V Khveshchenko
Oct 13, 2007·Physical Review Letters·H CercellierL Forró
Jan 17, 2012·Physical Review Letters·Takuya Yoshioka, Kenichi Asano
Jul 16, 2013·Physical Review Letters·Benoît FauquéKamran Behnia

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Citations

Jun 26, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zengwei ZhuYuki Fuseya
Jan 18, 2018·Physical Review Letters·F ArnoldJ Saunders
Jun 9, 2018·Nature Communications·B J RamshawR D McDonald
Mar 6, 2019·Nature Communications·Cheng-Long ZhangShuang Jia
Nov 18, 2020·Proceedings of the National Academy of Sciences of the United States of America·Jinhua WangKamran Behnia
Mar 31, 2021·Physical Review Letters·Christophe MarcenatBenoît Fauqué

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