<div class="csl-bib-body">
<div class="csl-entry">Pimenov, A. (2022, November 22). <i>2D quantum wells: band structures and quantum effects from terahertz spectroscopy</i> [Presentation]. Physikalisches Kolloquium des Max-Planck-Instituts für Metallforschung und der Universität Stuttgart, Stuttgart, Germany. http://hdl.handle.net/20.500.12708/139235</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/139235
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dc.description.abstract
Terahertz magneto-spectroscopy of 2D quantum wells allows to observe several classical and quantum phenomena. For example, HgTe-based heterostructures reveal fascinating thickness-dependent properties that arise due to inverted bands of the bulk material. Besides two-dimensional semimetals with coexisting electrons and holes, HgTe systems have been shown to take form of 3D topological insulators, Dirac semimetals, etc. Surprisingly, the band structure of these materials can be accessed experimentally via the analysis of the quasi-classical cyclotron resonance. Standard techniques like angle-resolved photoemission spectroscopy cannot be applied here due to multiple layers in the growth process.
In quantum regime, several physical effects can be observed in the terahertz range:
- Quantized Faraday rotation equal to the fine-structure constant in quantum anomalous Hall regime.
- Universal value of absorption equal to half of that in graphene.
- Unusual sensitivity/immunity of the photoresistance to the helicity of the terahertz radiation.
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dc.language.iso
en
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dc.subject
quantum wells
en
dc.subject
topology
en
dc.subject
Terahertz
en
dc.title
2D quantum wells: band structures and quantum effects from terahertz spectroscopy
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.type.category
Presentation
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tuw.publication.invited
invited
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
M1
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tuw.researchTopic.id
Q4
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Surfaces and Interfaces
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tuw.researchTopic.name
Nanoelectronics
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tuw.researchTopic.value
40
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tuw.researchTopic.value
30
-
tuw.researchTopic.value
30
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tuw.publication.orgunit
E138-05 - Forschungsbereich Solid State Spectroscopy
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tuw.author.orcid
0000-0001-6911-7117
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tuw.event.name
Physikalisches Kolloquium des Max-Planck-Instituts für Metallforschung und der Universität Stuttgart
de
tuw.event.startdate
22-11-2022
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tuw.event.enddate
22-11-2022
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tuw.event.online
Hybrid
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tuw.event.type
Event for scientific audience
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tuw.event.place
Stuttgart
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tuw.event.country
DE
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tuw.event.presenter
Pimenov, Andrei
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
100
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item.languageiso639-1
en
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item.grantfulltext
none
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item.openairecristype
http://purl.org/coar/resource_type/R60J-J5BD
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item.fulltext
no Fulltext
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item.openairetype
conference presentation
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item.cerifentitytype
Publications
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crisitem.author.dept
E138-05 - Forschungsbereich Solid State Spectroscopy