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Title: Graphite in 90 T: Evidence for Strong-Coupling Excitonic Pairing

Abstract

Strong magnetic field induces at least two phase transitions in graphite beyond the quantum limit where many-body effects are expected. We report on a study using a state-of-the-art nondestructive magnet allowing us to attain 90.5 T at 1.4 K, which reveals a new field-induced phase and evidence that the insulating state destroyed at 75 T is an excitonic condensate of electron-hole pairs. By monitoring the angle dependence of in-plane and out-of-plane magnetoresistance, we distinguish between the role of cyclotron and Zeeman energies in driving various phase transitions. We find that, with the notable exception of the transition field separating the two insulating states, the threshold magnetic field for all other transitions displays an exact cosine angular dependence. Remarkably, the threshold field for the destruction of the second insulator (phase B) is temperature independent with no detectable Landau-level crossing nearby. We conclude that the field-induced insulator starts as a weak-coupling density wave but ends as a strong-coupling excitonic insulator of spin-polarized electron-hole pairs.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1503935
Alternate Identifier(s):
OSTI ID: 1557746
Report Number(s):
LA-UR-18-28433
Journal ID: ISSN 2160-3308; PRXHAE; 011058
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Name: Physical Review. X Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; High Magnetic Field Science

Citation Formats

Zhu, Zengwei, Nie, Pan, Fauqué, Benoît, Vignolle, Baptiste, Proust, Cyril, McDonald, Ross D., Harrison, Neil, and Behnia, Kamran. Graphite in 90 T: Evidence for Strong-Coupling Excitonic Pairing. United States: N. p., 2019. Web. doi:10.1103/PhysRevX.9.011058.
Zhu, Zengwei, Nie, Pan, Fauqué, Benoît, Vignolle, Baptiste, Proust, Cyril, McDonald, Ross D., Harrison, Neil, & Behnia, Kamran. Graphite in 90 T: Evidence for Strong-Coupling Excitonic Pairing. United States. doi:10.1103/PhysRevX.9.011058.
Zhu, Zengwei, Nie, Pan, Fauqué, Benoît, Vignolle, Baptiste, Proust, Cyril, McDonald, Ross D., Harrison, Neil, and Behnia, Kamran. Fri . "Graphite in 90 T: Evidence for Strong-Coupling Excitonic Pairing". United States. doi:10.1103/PhysRevX.9.011058.
@article{osti_1503935,
title = {Graphite in 90 T: Evidence for Strong-Coupling Excitonic Pairing},
author = {Zhu, Zengwei and Nie, Pan and Fauqué, Benoît and Vignolle, Baptiste and Proust, Cyril and McDonald, Ross D. and Harrison, Neil and Behnia, Kamran},
abstractNote = {Strong magnetic field induces at least two phase transitions in graphite beyond the quantum limit where many-body effects are expected. We report on a study using a state-of-the-art nondestructive magnet allowing us to attain 90.5 T at 1.4 K, which reveals a new field-induced phase and evidence that the insulating state destroyed at 75 T is an excitonic condensate of electron-hole pairs. By monitoring the angle dependence of in-plane and out-of-plane magnetoresistance, we distinguish between the role of cyclotron and Zeeman energies in driving various phase transitions. We find that, with the notable exception of the transition field separating the two insulating states, the threshold magnetic field for all other transitions displays an exact cosine angular dependence. Remarkably, the threshold field for the destruction of the second insulator (phase B) is temperature independent with no detectable Landau-level crossing nearby. We conclude that the field-induced insulator starts as a weak-coupling density wave but ends as a strong-coupling excitonic insulator of spin-polarized electron-hole pairs.},
doi = {10.1103/PhysRevX.9.011058},
journal = {Physical Review. X},
number = 1,
volume = 9,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevX.9.011058

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Cited by: 1 work
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Figures / Tables:

FIG. 1 FIG. 1: (a) Field dependence of in-plane magnetoresistance ρxx and out-of-plane magnetoresistance ρzz up to 90.5 T at 1.4 K. The sketches illustrate configurations. (b) The field dependence of ratio ρzzxx. The quantum limit (QL) and the three phases (A, B, and C) are designated. The zero-field anisotropy is asmore » large as 500. However, it cannot be resolved in our pulsed field data, which is not accurate at low fields.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.