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Transport properties of quantum dot ...

Chen, Chih-Chieh.

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Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits./
作者:	Chen, Chih-Chieh.
面頁冊數:	112 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
Contained By:	Dissertation Abstracts International77-12B(E).
標題:	Condensed matter physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10151774
ISBN:	9781369064780

Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits.
Chen, Chih-Chieh.

Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits. - 112 p.

Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2015.

Coupled Quantum dots systems, or quantum dot molecules (QDMs), have been suggested as good candidates for nanoelectronics, spintronics, thermoelectrics, and quantum computing applications. The knowledge in the transport and electronic properties of QDMs is important in making progress toward practical devices. We use many-body equation of motion method for Hubbard-Anderson model to study non-equilibrium charge and thermal transport properties of QDMs connected to metallic electrodes in the Coulomb blockade regime. An exterior algebra method is developed to construct the equation of motion computationally, taking into account all correlation functions. The quantum interference (QI) effect of triangular quantum dot molecule (TQDM) resulting from electron coherent tunneling between quantum dots is revealed. The spectra of electrical conductance of TQDM with charge filling from one to six electrons clearly depict the many-body and topological effects. The calculated charge stability diagram for conductance and total occupation numbers match well with the recent experimental measurements. We also demonstrate that the destructive QI effect on the tunneling current of TQDM is robust with respect to temperature variation, making the single electron QI transistor feasible at higher temperatures. The thermoelectric properties of QDMs with high figure of merit are also illustrated.

ISBN: 9781369064780Subjects--Topical Terms:

3173567
Condensed matter physics.

Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits.
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245 1 0 $a Transport properties of quantum dot molecules and electronic structure of graphene quantum dot qubits.
300 $a 112 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
500 $a Adviser: Michael Stone.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2015.
520 $a Coupled Quantum dots systems, or quantum dot molecules (QDMs), have been suggested as good candidates for nanoelectronics, spintronics, thermoelectrics, and quantum computing applications. The knowledge in the transport and electronic properties of QDMs is important in making progress toward practical devices. We use many-body equation of motion method for Hubbard-Anderson model to study non-equilibrium charge and thermal transport properties of QDMs connected to metallic electrodes in the Coulomb blockade regime. An exterior algebra method is developed to construct the equation of motion computationally, taking into account all correlation functions. The quantum interference (QI) effect of triangular quantum dot molecule (TQDM) resulting from electron coherent tunneling between quantum dots is revealed. The spectra of electrical conductance of TQDM with charge filling from one to six electrons clearly depict the many-body and topological effects. The calculated charge stability diagram for conductance and total occupation numbers match well with the recent experimental measurements. We also demonstrate that the destructive QI effect on the tunneling current of TQDM is robust with respect to temperature variation, making the single electron QI transistor feasible at higher temperatures. The thermoelectric properties of QDMs with high figure of merit are also illustrated.
520 $a Graphene nanoribbon quantum dot qubits have been proposed as promising candidates for quantum computing applications to overcome the spin-decoherence problems associated with GaAs quantum dot qubits. We perform theoretical studies of the electronic structures of graphene nanoribbon quantum dots by solving the Dirac equation with appropriate boundary conditions. We then evaluate the exchange splitting based on an unrestricted Hartree-Fock method for the Dirac particles. The electronic wave function and long-range exchange coupling due to the Klein tunneling and the Coulomb interaction are calculated for various gate configurations. It is found that the exchange coupling between qubits can be significantly enhanced by the Klein tunneling effect. The implications of our results for practical qubit construction and operation are discussed.
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