Exciton condensation in biased bilayer graphene

Scammell, HD; Sushkov, OP

Exciton condensation in biased bilayer graphene

Scammell, HD Sushkov, OP

Permalink

Publisher:: AMER PHYSICAL SOC
Publication Type:: Journal Article
Citation:: Physical Review Research, 2023, 5, (4)
Issue Date:: 2023-10-01

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download Published versionAdobe PDF (920.9 kB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Scammell, HD
dc.contributor.author	Sushkov, OP
dc.date.accessioned	2024-03-11T04:22:47Z
dc.date.available	2024-03-11T04:22:47Z
dc.date.issued	2023-10-01
dc.identifier.citation	Physical Review Research, 2023, 5, (4)
dc.identifier.issn	2643-1564
dc.identifier.issn	2643-1564
dc.identifier.uri	http://hdl.handle.net/10453/176466
dc.description.abstract	We consider suspended bilayer graphene under applied perpendicular electric bias field that is known to generate a single particle gap 2Δ and a related electric polarization P. We argue that the bias also drives a quantum phase transition from band insulator to superfluid exciton condensate. The transition occurs when the exciton binding energy exceeds the band gap 2Δ. We predict the critical bias (converted to band gap), Δc≈60 meV, below which the excitons condense. The critical temperature, Tc(Δ), is maximum at Δ≈25 meV, Tcmax≈115 K, decreasing significantly at smaller Δ due to thermal screening. Entering the condensate phase, the superfluid transition is accompanied by a cusp in the electric polarization P(Δ) at Δ→Δc, which provides a striking testable signature. Additionally, we find that the condensate prefers to form a pair density wave.
dc.language	English
dc.publisher	AMER PHYSICAL SOC
dc.relation.ispartof	Physical Review Research
dc.relation.isbasedon	10.1103/PhysRevResearch.5.043176
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	51 Physical sciences
dc.title	Exciton condensation in biased bilayer graphene
dc.type	Journal Article
utslib.citation.volume	5
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access	*
dc.date.updated	2024-03-11T04:22:46Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	5
utslib.citation.issue	4

Abstract:

We consider suspended bilayer graphene under applied perpendicular electric bias field that is known to generate a single particle gap 2Δ and a related electric polarization P. We argue that the bias also drives a quantum phase transition from band insulator to superfluid exciton condensate. The transition occurs when the exciton binding energy exceeds the band gap 2Δ. We predict the critical bias (converted to band gap), Δc≈60 meV, below which the excitons condense. The critical temperature, Tc(Δ), is maximum at Δ≈25 meV, Tcmax≈115 K, decreasing significantly at smaller Δ due to thermal screening. Entering the condensate phase, the superfluid transition is accompanied by a cusp in the electric polarization P(Δ) at Δ→Δc, which provides a striking testable signature. Additionally, we find that the condensate prefers to form a pair density wave.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/176466