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Title: Spin magnetometry as a probe of stripe superconductivity in twisted bilayer graphene

Abstract

The discovery of alternating superconducting and insulating ground states in magic angle graphene has suggested an intriguing analogy with cuprate high-T c materials. In this paper we argue that the network states of small angle twisted bilayer graphene (TBG) afford a further perspective on the cuprates by emulating their stripe-ordered phases, as in La 1.875Ba 0.125CuO 4. We show that the spin and valley quantum numbers of stripes in TBG graphene fractionalize, developing characteristic signatures in the tunneling density of states and the magnetic noise spectrum of impurity spins. By examining the coupling between the charge rivers we determine the superconducting transition temperature. Our study suggests that twisted bilayer graphene can be used for a controlled emulation of stripe superconductivity and quantum sensing experiments of emergent anyonic excitations.

Authors:
ORCiD logo [1];  [2]; ORCiD logo [3]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Rutgers Univ., Piscataway, NJ (United States); Royal Holloway, Univ. of London (RHUL), Egham (United Kingdom)
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1659695
Report Number(s):
BNL-216359-2020-JAAM
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
SC0012704; FG02-99ER45790
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 102; Journal Issue: 10; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

König, E. J., Coleman, Piers, and Tsvelik, Alexei M. Spin magnetometry as a probe of stripe superconductivity in twisted bilayer graphene. United States: N. p., 2020. Web. doi:10.1103/physrevb.102.104514.
König, E. J., Coleman, Piers, & Tsvelik, Alexei M. Spin magnetometry as a probe of stripe superconductivity in twisted bilayer graphene. United States. doi:10.1103/physrevb.102.104514.
König, E. J., Coleman, Piers, and Tsvelik, Alexei M. Tue . "Spin magnetometry as a probe of stripe superconductivity in twisted bilayer graphene". United States. doi:10.1103/physrevb.102.104514.
@article{osti_1659695,
title = {Spin magnetometry as a probe of stripe superconductivity in twisted bilayer graphene},
author = {König, E. J. and Coleman, Piers and Tsvelik, Alexei M.},
abstractNote = {The discovery of alternating superconducting and insulating ground states in magic angle graphene has suggested an intriguing analogy with cuprate high-Tc materials. In this paper we argue that the network states of small angle twisted bilayer graphene (TBG) afford a further perspective on the cuprates by emulating their stripe-ordered phases, as in La1.875Ba0.125CuO4. We show that the spin and valley quantum numbers of stripes in TBG graphene fractionalize, developing characteristic signatures in the tunneling density of states and the magnetic noise spectrum of impurity spins. By examining the coupling between the charge rivers we determine the superconducting transition temperature. Our study suggests that twisted bilayer graphene can be used for a controlled emulation of stripe superconductivity and quantum sensing experiments of emergent anyonic excitations.},
doi = {10.1103/physrevb.102.104514},
journal = {Physical Review B},
issn = {2469-9950},
number = 10,
volume = 102,
place = {United States},
year = {2020},
month = {9}
}

Journal Article:
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