Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases

I. Smorchkova, Nitin Samarth, J. Kikkawa, D. Awschalom

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.

Original languageEnglish (US)
Pages (from-to)R4238-R4241
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume58
Issue number8
DOIs
StatePublished - Jan 1 1998

Fingerprint

Giant magnetoresistance
Two dimensional electron gas
electron gas
Phase transitions
Magnetoresistance
Magnetic fields
Geometry
Liquids
retarding
orbitals
liquids
geometry
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

@article{4d084630d8b0419c885ef6456b6577a3,
title = "Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases",
abstract = "The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700{\%}. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.",
author = "I. Smorchkova and Nitin Samarth and J. Kikkawa and D. Awschalom",
year = "1998",
month = "1",
day = "1",
doi = "10.1103/PhysRevB.58.R4238",
language = "English (US)",
volume = "58",
pages = "R4238--R4241",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "8",

}

Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases. / Smorchkova, I.; Samarth, Nitin; Kikkawa, J.; Awschalom, D.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 58, No. 8, 01.01.1998, p. R4238-R4241.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Giant magnetoresistance and quantum phase transitions in strongly localized magnetic two-dimensional electron gases

AU - Smorchkova, I.

AU - Samarth, Nitin

AU - Kikkawa, J.

AU - Awschalom, D.

PY - 1998/1/1

Y1 - 1998/1/1

N2 - The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.

AB - The application of a small magnetic field (Formula presented) either parallel or perpendicular to a low-density (Formula presented) magnetic two-dimensional electron gas (2DEG) creates a striking positive magnetoresistance of up to 700%. This is a spin effect, caused by the suppression of spin-dependent hopping paths between localized states with on-site correlation. At higher fields, a spin-related delocalization is observed. In the perpendicular field geometry, orbital effects combine with this delocalization and lead to quantum phase transitions between the spin-polarized insulating state and the (Formula presented) quantum Hall liquid.

UR - http://www.scopus.com/inward/record.url?scp=0001340735&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001340735&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.58.R4238

DO - 10.1103/PhysRevB.58.R4238

M3 - Article

VL - 58

SP - R4238-R4241

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 8

ER -