Dynamics of the far-infrared photoresponse in quantum Hall systems

Kalugin, Nikolai G.; Vasilyev, Yu. B.; Suchalkin, S.; Nachtwei, G.; Sagol, B.E.; Eberl, K.

doi:10.1103/physrevb.66.085308

Cited by 23 publications

(14 citation statements)

References 19 publications

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“…These time scales are comparable to those reported in [7] (estimated by an indirect method), but several orders of magnitude shorter in comparison to data published at meander type detectors [2,4]. We find the relaxation time changing with variation of V SD .…”

Section: Resultssupporting

confidence: 84%

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Short decay times of the THz photoresponse in quantum Hall Corbino detectors with spectral tunability

Hirsch¹,

Stellmach²,

Kalugin³

et al. 2005

AIP Conference Proceedings

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The THz photoconductivity of quantum Hall systems (QHS) around filling factor ν=2 has been investigated. As radiation source a pulsed p-Ge Laser tunable in the frequency range form 1.7 THz to 2.5 THz is used. Via variation of the magnetic field, the carrier concentration (tuned by a gate) and the source drain voltage the spectral resolution of QHS as THz detector is determined. The spectral resolution is found best at voltages close to the breakdown value. In addition we report time resolved measurements with relaxations times from 20 ns to 150 ns.

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Section: Resultssupporting

confidence: 84%

“…The response of QH-samples to FIR radiation is due to two mechanisms: The bolometer effect, which is pinned at the QH minimum and cyclotron-resonance (CR), appearing at E Laser =hω c =heB/m * (with the GaAseffective mass m * = 0.067m e ) [4]. Variation of the magnetic field B enables spectral tunability.…”

Section: Spectral Resolutionmentioning

confidence: 99%

Short decay times of the THz photoresponse in quantum Hall Corbino detectors with spectral tunability

Hirsch¹,

Stellmach²,

Kalugin³

et al. 2005

AIP Conference Proceedings

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“…In general, we find shorter times at lower mobility. The time scales are noticeably shorter in comparison to those found on meander-shaped samples previosly [7]. For the samples #8447 and #8788 the τ (V SD )-dependence shows clear maxima slightly beneath the QHbreakdown voltage V c .…”

Section: Time Resolved Measurementsmentioning

confidence: 79%

“…This is explained by the heating effect of the THz radiation (bolometric response, see e.g. [2,3,7]). At the cyclotron resonance (CR) position, where E p is equal to the cyclotron energyhw c =heB/m * (with the effective mass m * = 0.067 m e ), we see the following behavior: if the QH-plateau position is near to the CR-position the PR is massively enhanced (the case of overlapping of the bolometric and CR effect).…”

Section: Measurements On Gaas/algaas Heterostructuresmentioning

confidence: 99%

Terahertz photoconductivity in GaAs/AlGaAs and HgTe/HgCdTe quantum Hall devices

Stellmach

Bonk

Vasilyev

et al. 2006

Phys. Status Solidi (c)

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We present measurements of the THz photoconductivity on different quantum Hall systems. GaAs/AlGaAs and HgTe/HgCdTe (MCT) heterostructures with Hall-bar and Corbino geometry are investigated. A recipe for the preparation of metallic Corbino contacts on MCT is shown. The system is excited by the radiation of a p-Ge laser (tunable from 1.7 to 2.5 THz) and the photoresponse (PR) is measured versus the magnetic field B. We observe enhanced PR around integer filling factors (bolometric PR) and cyclotron resonance (CR) effects. Because of the lower effective mass in MCT, the CR in this system appears at a relatively low magnetic field (≈ 2 T). This is appropriate for possible applications. Finally we present time resolved measurements of the PR on the GaAs system. We find relaxation times from about 10 to over 200 ns, which depend on the geometry, the applied source-drain voltage and the on mobility of the sample.

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“…6 The sensitivity of QHE in GaAs 2DEG to radiation has been exploited to engineer ultrasensitive, tunable, frequency agile far-IR/THz photodetectors with nanosecond response time. [6][7][8][9] However, the wide use of GaAs QHE photodetectors is limited by the need of cooling detectors down to liquid Helium temperatures, and no "classical" semiconductor-based QHE photodetectors operate above 12 K. 9 Here, we demonstrate the operation of infrared QHE graphene-based detectors at 70 K, a temperature achievable using simple pumped liquid Nitrogen cryostats, in magnetic field of 7.35 T. Due to graphene's unique band structure, the first few Landau levels are well-separated energetically, thus allowing observation and manipulation of QHE at unprecedentedly high temperatures. 10 Our results overcome the obstacle of low operating temperature in traditional semiconductor systems and open the door for wide arrays of applications.…”

mentioning

confidence: 98%

Graphene-based quantum Hall effect infrared photodetector operating at liquid Nitrogen temperatures

Kalugin

Jing

Bao

et al. 2011

Applied Physics Letters

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We demonstrate a quantum Hall effect (QHE) graphene-based infrared photodetector that functions at 70K—a temperature achievable using liquid Nitrogen in vapor evacuation regime. This result opens up the possibility of wider use of QHE photodetectors if graphene is utilized instead of “classical” materials with two-dimensional electron gas. The potential advantages to this approach are increased operating temperature, reduced magnetic field, and wider range of operating frequency compared to previous implementations of QHE detectors.

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Dynamics of the far-infrared photoresponse in quantum Hall systems

Cited by 23 publications

References 19 publications

Short decay times of the THz photoresponse in quantum Hall Corbino detectors with spectral tunability

Short decay times of the THz photoresponse in quantum Hall Corbino detectors with spectral tunability

Terahertz photoconductivity in GaAs/AlGaAs and HgTe/HgCdTe quantum Hall devices

Graphene-based quantum Hall effect infrared photodetector operating at liquid Nitrogen temperatures

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