Quantum phases of electron double layers: Soft collective modes and finite-temperature phase transitions

Vittorio Pellegrini; Aron Pinczuk; Brian S. Dennis; Loren N. Pfeiffer; Ken W. West

doi:10.1016/S1386-9477(99)00112-5

Quantum phases of electron double layers: Soft collective modes and finite-temperature phase transitions

Vittorio Pellegrini, Aron Pinczuk, Brian S. Dennis, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journal › Conference article › peer-review

Abstract

The extreme softening of spin excitations in electron double layers is studied by resonant inelastic light scattering. At even-integer quantum Hall states we find evidence of three distinct configurations of spin. Transformations among these spin states appear as quantum phase transitions tuned by interlayer interactions and Zeeman energies. A broken-symmetry phase emerges when a long-wavelength spin excitation across the tunneling gap goes soft. Spectra measured in this phase offer remarkable evidence of finite-temperature phase transitions. Critical temperatures determined from spectra display significant dependence on magnetic field.

Original language	English (US)
Pages (from-to)	573-576
Number of pages	4
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	6
Issue number	1
DOIs	https://doi.org/10.1016/S1386-9477(99)00112-5
State	Published - Feb 2000
Externally published	Yes
Event	13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-13) - Ottawa, Ont, Can Duration: Aug 1 1999 → Aug 6 1999

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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10.1016/S1386-9477(99)00112-5

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title = "Quantum phases of electron double layers: Soft collective modes and finite-temperature phase transitions",

abstract = "The extreme softening of spin excitations in electron double layers is studied by resonant inelastic light scattering. At even-integer quantum Hall states we find evidence of three distinct configurations of spin. Transformations among these spin states appear as quantum phase transitions tuned by interlayer interactions and Zeeman energies. A broken-symmetry phase emerges when a long-wavelength spin excitation across the tunneling gap goes soft. Spectra measured in this phase offer remarkable evidence of finite-temperature phase transitions. Critical temperatures determined from spectra display significant dependence on magnetic field.",

author = "Vittorio Pellegrini and Aron Pinczuk and Dennis, {Brian S.} and Pfeiffer, {Loren N.} and West, {Ken W.}",

year = "2000",

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doi = "10.1016/S1386-9477(99)00112-5",

language = "English (US)",

volume = "6",

pages = "573--576",

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T1 - Quantum phases of electron double layers

T2 - 13th International Conference on the Electronic Properties of Two-Dimensional Systems (EP2DS-13)

AU - Pellegrini, Vittorio

AU - Pinczuk, Aron

AU - Dennis, Brian S.

AU - Pfeiffer, Loren N.

AU - West, Ken W.

PY - 2000/2

Y1 - 2000/2

N2 - The extreme softening of spin excitations in electron double layers is studied by resonant inelastic light scattering. At even-integer quantum Hall states we find evidence of three distinct configurations of spin. Transformations among these spin states appear as quantum phase transitions tuned by interlayer interactions and Zeeman energies. A broken-symmetry phase emerges when a long-wavelength spin excitation across the tunneling gap goes soft. Spectra measured in this phase offer remarkable evidence of finite-temperature phase transitions. Critical temperatures determined from spectra display significant dependence on magnetic field.

AB - The extreme softening of spin excitations in electron double layers is studied by resonant inelastic light scattering. At even-integer quantum Hall states we find evidence of three distinct configurations of spin. Transformations among these spin states appear as quantum phase transitions tuned by interlayer interactions and Zeeman energies. A broken-symmetry phase emerges when a long-wavelength spin excitation across the tunneling gap goes soft. Spectra measured in this phase offer remarkable evidence of finite-temperature phase transitions. Critical temperatures determined from spectra display significant dependence on magnetic field.

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U2 - 10.1016/S1386-9477(99)00112-5

DO - 10.1016/S1386-9477(99)00112-5

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AN - SCOPUS:0034138947

SN - 1386-9477

VL - 6

SP - 573

EP - 576

JO - Physica E: Low-Dimensional Systems and Nanostructures

JF - Physica E: Low-Dimensional Systems and Nanostructures

IS - 1

Y2 - 1 August 1999 through 6 August 1999

ER -

Quantum phases of electron double layers: Soft collective modes and finite-temperature phase transitions

Abstract

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