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Magnetophonon oscillations in graphene with a large applied DC bias voltage

Research output: Thesis › Master's Thesis

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Magnetophonon oscillations in graphene with a large applied DC bias voltage. / Wengraf, Joshua.
Lancaster University, 2020. 61 p.

Research output: Thesis › Master's Thesis

Harvard

Wengraf, J 2020, 'Magnetophonon oscillations in graphene with a large applied DC bias voltage', Masters by Research, Lancaster University. https://doi.org/10.17635/lancaster/thesis/836

APA

Wengraf, J. (2020). Magnetophonon oscillations in graphene with a large applied DC bias voltage. [Master's Thesis, Lancaster University]. Lancaster University. https://doi.org/10.17635/lancaster/thesis/836

Vancouver

Wengraf J. Magnetophonon oscillations in graphene with a large applied DC bias voltage. Lancaster University, 2020. 61 p. doi: 10.17635/lancaster/thesis/836

Author

Wengraf, Joshua. / Magnetophonon oscillations in graphene with a large applied DC bias voltage. Lancaster University, 2020. 61 p.

Bibtex

@mastersthesis{9b5566d2887f4fe2a231406aa5e386cf,
title = "Magnetophonon oscillations in graphene with a large applied DC bias voltage",
abstract = "Magnetophonon resonance (MPR) oscillations are a valuable spectroscopic toolfor studying electron interactions in solids. This type of spectroscopy is performed by applying a magnetic field to the solid, to quantise the energy of the charge carriers, and inter-Landau level scattering transitions are observed as oscillations in magnetoresistance. Since the transition energy is known, these oscillations can be used to identify phonons responsible for the inter-Landau level scattering. These oscillations, which arise due to scattering of Dirac fermions by transverse and longitudinal acoustic phonons, appear onlyin large graphene Hall bars with dimensions in excess of 10 um (greater than the phonon scattering mean free path). Here we apply large current-induced bias voltages (up to 1 mA) through a large graphene Hall bar and study the effect on the MPR oscillations. We observe a splitting of these oscillations due to a spatial tilting of the Landau levels induced by a strong Hall electric field. At sufficiently large Hall fields we also observe `phonon-less' inter-Landau level scattering transitions which arise when the Landau level states become parallel in energy. Finally, we observe an additional scattering process when the drift velocity approaches the speed of the transverse acoustic phonon.",
author = "Joshua Wengraf",
year = "2020",
month = jan,
day = "22",
doi = "10.17635/lancaster/thesis/836",
language = "English",
publisher = "Lancaster University",
school = "Lancaster University",

}

RIS

TY - GEN

T1 - Magnetophonon oscillations in graphene with a large applied DC bias voltage

AU - Wengraf, Joshua

PY - 2020/1/22

Y1 - 2020/1/22

N2 - Magnetophonon resonance (MPR) oscillations are a valuable spectroscopic toolfor studying electron interactions in solids. This type of spectroscopy is performed by applying a magnetic field to the solid, to quantise the energy of the charge carriers, and inter-Landau level scattering transitions are observed as oscillations in magnetoresistance. Since the transition energy is known, these oscillations can be used to identify phonons responsible for the inter-Landau level scattering. These oscillations, which arise due to scattering of Dirac fermions by transverse and longitudinal acoustic phonons, appear onlyin large graphene Hall bars with dimensions in excess of 10 um (greater than the phonon scattering mean free path). Here we apply large current-induced bias voltages (up to 1 mA) through a large graphene Hall bar and study the effect on the MPR oscillations. We observe a splitting of these oscillations due to a spatial tilting of the Landau levels induced by a strong Hall electric field. At sufficiently large Hall fields we also observe `phonon-less' inter-Landau level scattering transitions which arise when the Landau level states become parallel in energy. Finally, we observe an additional scattering process when the drift velocity approaches the speed of the transverse acoustic phonon.

AB - Magnetophonon resonance (MPR) oscillations are a valuable spectroscopic toolfor studying electron interactions in solids. This type of spectroscopy is performed by applying a magnetic field to the solid, to quantise the energy of the charge carriers, and inter-Landau level scattering transitions are observed as oscillations in magnetoresistance. Since the transition energy is known, these oscillations can be used to identify phonons responsible for the inter-Landau level scattering. These oscillations, which arise due to scattering of Dirac fermions by transverse and longitudinal acoustic phonons, appear onlyin large graphene Hall bars with dimensions in excess of 10 um (greater than the phonon scattering mean free path). Here we apply large current-induced bias voltages (up to 1 mA) through a large graphene Hall bar and study the effect on the MPR oscillations. We observe a splitting of these oscillations due to a spatial tilting of the Landau levels induced by a strong Hall electric field. At sufficiently large Hall fields we also observe `phonon-less' inter-Landau level scattering transitions which arise when the Landau level states become parallel in energy. Finally, we observe an additional scattering process when the drift velocity approaches the speed of the transverse acoustic phonon.

U2 - 10.17635/lancaster/thesis/836

DO - 10.17635/lancaster/thesis/836

M3 - Master's Thesis

PB - Lancaster University

ER -