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

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 m...

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Autores principales:	Z. Zhu, R. D. McDonald, A. Shekhter, B. J. Ramshaw, K. A. Modic, F. F. Balakirev, N. Harrison
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/90bde4c22cf34d78a530c62735ec8ca6
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spelling	oai:doaj.org-article:90bde4c22cf34d78a530c62735ec8ca62021-12-02T15:05:44ZMagnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite10.1038/s41598-017-01693-52045-2322https://doaj.org/article/90bde4c22cf34d78a530c62735ec8ca62017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01693-5https://doaj.org/toc/2045-2322Abstract 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.Z. ZhuR. D. McDonaldA. ShekhterB. J. RamshawK. A. ModicF. F. BalakirevN. HarrisonNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-6 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Z. Zhu R. D. McDonald A. Shekhter B. J. Ramshaw K. A. Modic F. F. Balakirev N. Harrison Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
description	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.
format	article
author	Z. Zhu R. D. McDonald A. Shekhter B. J. Ramshaw K. A. Modic F. F. Balakirev N. Harrison
author_facet	Z. Zhu R. D. McDonald A. Shekhter B. J. Ramshaw K. A. Modic F. F. Balakirev N. Harrison
author_sort	Z. Zhu
title	Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
title_short	Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
title_full	Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
title_fullStr	Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
title_full_unstemmed	Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
title_sort	magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/90bde4c22cf34d78a530c62735ec8ca6
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Magnetic field tuning of an excitonic insulator between the weak and strong coupling regimes in quantum limit graphite

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