Theoretical study on quantum dynamics in single-electron quantum-dot pump단일 전자 양자점 펌프에서 양자역학적 동역학에 대한 이론적 연구

Cited 0 time in webofscience Cited 0 time in scopus
  • Hit : 587
  • Download : 0
DC FieldValueLanguage
dc.contributor.advisorSim, Heung-Sun-
dc.contributor.advisor심흥선-
dc.contributor.authorRyu, Sungguen-
dc.contributor.author류성근-
dc.date.accessioned2018-05-23T19:33:28Z-
dc.date.available2018-05-23T19:33:28Z-
dc.date.issued2017-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=675690&flag=dissertationen_US
dc.identifier.urihttp://hdl.handle.net/10203/241771-
dc.description학위논문(박사) - 한국과학기술원 : 물리학과, 2017.2,[v, 50 p. :]-
dc.description.abstractA quantum-dot pump is an on-demand single-electron source which has the unique property of emitting hot electrons of $\sim$100 meV above Fermi energy with very small pumping error of order 0.1 part per million. In order to utilize it for a quantum metrology as well as a fermion version of optics and related quantum processing, it is important to understand the quantum dynamics during the pumping. Due to the unique property of the quantum-dot pump, the dynamics involves complications such as a non-equilibrium electron-capturing process, which determines the pumping accuracy, nonadiabatic electron-wave-packet evolution in the pump and its tunneling through a quantum-dot barrier, which determines the wave-function characteristics, and relaxation of hot electron emitted from the pump, which affects the coherence of the pumped electron. In this thesis, we present a series of our studies concerning aforementioned complications. First, we analyze how the potential shape of the quantum-dot affects the capturing process and the pumping accuracy. We find that the improvement of the pump accuracy observed in a anisotropic quantum-dot potential was mainly due to the thicker potential barrier. Second, we study the relaxation mechanism of the pumped electron by scattering with phonons. We calculate the scattering rate between hot electron and phonons and elucidated the mechanism of the suppression of the scattering which was observed in the pump under a strong magnetic field. Lastly, we propose how to generate and detect an electron in a Gaussian state, using a quantum-dot pump with gigahertz operation and realistic parameters. The proposal is based on our finding on general properties (coherent-state motion and tunneling dynamics) of electron wave packet in a 2D dynamic quantum dot under a strong magnetic field.-
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectQuantum dot-
dc.subjectsingle electron pump-
dc.subjecttunneling time-
dc.subjectquantum metrology-
dc.subjectmesoscopic physics-
dc.subject양자점-
dc.subject단일 전자 펌프-
dc.subject터널링 시간-
dc.subject양자 도량형-
dc.subject중시계 물리-
dc.titleTheoretical study on quantum dynamics in single-electron quantum-dot pump-
dc.title.alternative단일 전자 양자점 펌프에서 양자역학적 동역학에 대한 이론적 연구-
dc.typeThesis(Ph.D)-
dc.identifier.CNRN325007-
dc.description.department한국과학기술원 :물리학과,-
Appears in Collection
PH-Theses_Ph.D.(박사논문)
Files in This Item
There are no files associated with this item.

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0