Detection of spin polarization with a side-coupled quantum dot

Otsuka, Takeshi; Abe, Eiichi; Iye, Yasuhiro; Katsumoto, Shingo

doi:10.1103/physrevb.79.195313

Cited by 16 publications

(15 citation statements)

References 22 publications

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“…In case of quantum Hall (QH) edge transport, the electron spins are polarized in the edge state for odd filling factors, while they are unpolarized with even filling factors. This parity effect leads to polarizing nuclear spins 7 8 and reading spin state in quantum dot 9 10 . In this way, the parity effects have played important roles on developing the research area.…”

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confidence: 99%

Parity effect of bipolar quantum Hall edge transport around graphene antidots

Matsuo

Nakaharai

Komatsu

et al. 2015

Sci Rep

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Parity effect, which means that even-odd property of an integer physical parameter results in an essential difference, ubiquitously appears and enables us to grasp its physical essence as the microscopic mechanism is less significant in coarse graining. Here we report a new parity effect of quantum Hall edge transport in graphene antidot devices with pn junctions (PNJs). We found and experimentally verified that the bipolar quantum Hall edge transport is drastically affected by the parity of the number of PNJs. This parity effect is universal in bipolar quantum Hall edge transport of not only graphene but also massless Dirac electron systems. These results offer a promising way to design electron interferometers in graphene.

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confidence: 99%

Parity effect of bipolar quantum Hall edge transport around graphene antidots

Matsuo

Nakaharai

Komatsu

et al. 2015

Sci Rep

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“…One possible way is by using the so-called spin blockade effect. One introduces a QD with a strong Coulomb interaction on or near the outgoing lead [43,44]. Starting with no occupation on this dot, and then increasing the gate voltage on it to capture one electron from the polarized flow, will block the current due to Pauli's exclusion principle.…”

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confidence: 99%

Spin filtering in a Rashba–Dresselhaus–Aharonov–Bohm double-dot interferometer

et al. 2013

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We study the spin-dependent transport of spin-1/2 electrons through an interferometer made of two elongated quantum dots or quantum nanowires, which are subject to both an Aharonov-Bohm flux and (Rashba and Dresselhaus) spin-orbit interactions. Similar to the diamond interferometer proposed in our previous papers (Aharony et al 2011 Phys. Rev. B 84 035323; Matityahu et al 2013 Phys . Rev. B 87 205438), we show that the double-dot interferometer can serve as a perfect spin filter due to a spin interference effect. By appropriately tuning the external electric and magnetic fields which determine the Aharonov-Casher and Aharonov-Bohm phases, and with some relations between the various hopping amplitudes and site energies, the interferometer blocks electrons with a specific spin polarization, independent of their energy. The blocked polarization and the polarization of the outgoing electrons is 6

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“…The main difficulty is again the impedance match problem between the ferromagnetic junction and the semiconductor at the output. Several proposed filters use quantum dots, in which the filtering is based on either the Coulomb blockade and the Pauli principle [17][18][19] or on the Zeeman energy splitting. 20,21 All the above filters usually generate only a partial spin polarization.…”

Section: Introductionmentioning

confidence: 99%

Filtering and analyzing mobile qubit information via Rashba–Dresselhaus–Aharonov–Bohm interferometers

et al. 2011

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Spin-1/2 electrons are scattered through one or two diamond-like loops, made of quantum dots connected by one-dimensional wires, and subject to both an Aharonov-Bohm flux and (Rashba and Dresselhaus) spin-orbit interactions. With some symmetry between the two branches of each diamond, and with appropriate tuning of the electric and magnetic fields (or of the diamond shapes) this device completely blocks electrons with one polarization, and allows only electrons with the opposite polarization to be transmitted. The directions of these polarizations are tunable by these fields, and do not depend on the energy of the scattered electrons. For each range of fields one can tune the site and bond energies of the device so that the transmission of the fully polarized electrons is close to unity. Thus, these devices perform as ideal spin filters, and these electrons can be viewed as mobile qubits; the device writes definite quantum information on the spinors of the outgoing electrons. The device can also read the information written on incoming polarized electrons: the charge transmission through the device contains full information on this polarization. The double-diamond device can also act as a realization of the Datta-Das spin field-effect transistor.

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Detection of spin polarization with a side-coupled quantum dot

Cited by 16 publications

References 22 publications

Parity effect of bipolar quantum Hall edge transport around graphene antidots

Parity effect of bipolar quantum Hall edge transport around graphene antidots

Spin filtering in a Rashba–Dresselhaus–Aharonov–Bohm double-dot interferometer

Filtering and analyzing mobile qubit information via Rashba–Dresselhaus–Aharonov–Bohm interferometers

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