Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer

Buchholz, Sven S.; Fischer, Saskia F.; Kunze, U.; Bell, Matthew; Reuter, D.; Wieck, A. D.

doi:10.1103/physrevb.82.045432

Cited by 24 publications

(32 citation statements)

References 45 publications

(102 reference statements)

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“…() and a full characterization of the phase‐coherent quantum transport in such four‐terminal asymmetric quantum rings is given in Ref. . As shown in Section , a heating current raises

T_{e}

in the “heater” with respect to the bath temperature, which was set either to

T_{bath} = 1.4

K or to

T_{bath} = 4.2

K.…”

Section: Resultsmentioning

confidence: 99%

“…This leads to the conclusion that in this system the electron–phonon coupling does not yield significant contribution to the heat flow. In previous works , the electron dephasing in quasi‐1D quantum interferometers was investigated with respect to the increase of the lattice temperature. The relation

ν false(T_{lat} false) = ν_{0} e^{- α T_{lat}}

was shown to hold, with the visibility

ν

and the fitting parameter

α

.…”

Section: Discussionmentioning

confidence: 99%

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Heat flow, transport and fluctuations in etched semiconductor quantum wire structures

Riha

Chiatti

Buchholz

et al. 2016

Physica Status Solidi (a)

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Low‐dimensional transport in semiconductor meso‐ and nanostructures is a topical field of fundamental research with potential applications in future quantum devices. However, thermal non‐equilibrium may destroy phase‐coherence and remains to be explored experimentally. Here, we present effects of thermal non‐equilibrium in various implementations of low‐dimensional (non‐interacting) electron systems, fabricated by etching AlGaAs/GaAs heterostructures. These include narrow quasi‐two‐dimensional (2D) channels, quasi‐one‐dimensional (1D) waveguide networks, quantum rings (QRs), and single 1D constrictions, such as quantum point contacts (QPCs). Thermal non‐equilibrium is realized by current heating. The charge carrier temperature is determined by noise thermometry. The electrical conductance and the voltage–noise are measured with respect to bath temperatures, heating currents, thermal gradients, and electric fields. We determine and discuss heat transport processes, electron‐energy loss rates, and electron–phonon interaction, and our results are consistent with the Wiedemann–Franz relation. Additionally, we show how non‐thermal current fluctuations can be used to identify electric conductance anomalies due to charge states.

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“…() and a full characterization of the phase‐coherent quantum transport in such four‐terminal asymmetric quantum rings is given in Ref. . As shown in Section , a heating current raises

T_{e}

in the “heater” with respect to the bath temperature, which was set either to

T_{bath} = 1.4

K or to

T_{bath} = 4.2

K.…”

Section: Resultsmentioning

confidence: 99%

ν false(T_{lat} false) = ν_{0} e^{- α T_{lat}}

was shown to hold, with the visibility

ν

and the fitting parameter

α

.…”

Section: Discussionmentioning

confidence: 99%

Heat flow, transport and fluctuations in etched semiconductor quantum wire structures

Riha

Chiatti

Buchholz

et al. 2016

Physica Status Solidi (a)

Self Cite

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“…Reflections at the cross‐junctions of the leads can also result in the loss of the two‐path interference phase (). Therefore, in order to break the phase rigidity, it is necessary to use multiterminal and asymmetric QRs .…”

Section: Resultsmentioning

confidence: 99%

“…d). This non‐local resistance is sensitive to the transmission phase, due to the multiterminal and asymmetric geometry of the QR . Figure b shows the oscillatory component of the non‐local magnetoresistance

R_{21, 34}

as a function of B and

V_{g}

T = 23

mK.…”

Section: Resultsmentioning

confidence: 99%

Electron waveguide interferometers for spin‐dependent transport experiments

Chiatti

Buchholz

Kunze

et al. 2014

Physica Status Solidi (b)

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This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.Semiconductor nanostructures are of interest in the field of spintronics, because they allow us to employ special features of low-dimensional transport for spin polarization, manipulation, and detection. Proposals for spintronic devices are based on coherent transport and interference effects in extended electron waveguide (EWG) structures. We present the state-ofthe-art of low-dimensional EWGs and Aharonov-Bohm (AB) interferometers, fabricated in GaAs/AlGaAs heterostructures. Low-temperature measurements in etched quantum point contacts (QPCs) show large subband spacing and, in the presence of a source-drain DC bias, the differential conductance is resonantly enhanced due to a many-body modification of the barrier potential because of spin fluctuations. Multiterminal asymmetric quantum wire rings (QRs) have been fabricated and AB conductance oscillations are used to detect electrostatically induced continuous phase shifts and π-phase jumps, due to resonances and reflections at cross-junctions. The effects of measurement configuration and non-equilibrium in QR structures are also studied. By embedding a QPC into the leads of a QR, coherent mode-filtered injection of electrons into a few-mode AB interferometer is demonstrated. Single-and few-mode spin transport in EWG interferometers is discussed and the opportunities offered by embedding quantum dots for studying interaction and spin effects are presented. The results encourage the investigation of spin-dependent quantum transport in extended EWG interferometers.

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“…is determined from the frequency-independent part of the power spectral density of the thermal noise. 10,15 The phase coherence of interfering electrons in a similar device has been characterized before in theory and experiment 16,17 and thermal transport data measured in the same device have been reported. 10,15 The presence of junctions and crossings in a multi-terminal device requires to calculate the electric and thermal transport for the specific sample geometry across a range of Fermi energies.…”

Section: Introductionmentioning

confidence: 99%

Thermal energy and charge currents in multi-terminal nanorings

et al. 2016

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We study in experiment and theory thermal energy and charge transfer close to the quantum limit in a ballistic nanodevice, consisting of multiply connected one-dimensional electron waveguides. The fabricated device is based on an AlGaAs/GaAs heterostructure and is covered by a global top-gate to steer the thermal energy and charge transfer in the presence of a temperature gradient, which is established by a heating current. The estimate of the heat transfer by means of thermal noise measurements shows the device acting as a switch for charge and thermal energy transfer. The wave-packet simulations are based on the multi-terminal Landauer-Büttiker approach and confirm the experimental finding of a mode-dependent redistribution of the thermal energy current, if a scatterer breaks the device symmetry.

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Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer

Cited by 24 publications

References 45 publications

Heat flow, transport and fluctuations in etched semiconductor quantum wire structures

Heat flow, transport and fluctuations in etched semiconductor quantum wire structures

Electron waveguide interferometers for spin‐dependent transport experiments

Thermal energy and charge currents in multi-terminal nanorings

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