Quantum theory of an electron waiting time clock
Autor: | David Dasenbrook, Christian Flindt |
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Přispěvatelé: | University of Geneva, Department of Applied Physics, Aalto-yliopisto, Aalto University |
Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Physics
Mesoscopic physics ta114 Condensed Matter - Mesoscale and Nanoscale Physics Quantum point contact Detector FOS: Physical sciences Charge (physics) 02 engineering and technology Electron 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Conductor Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics 0210 nano-technology Quantum Voltage |
Zdroj: | Physical Review B |
Popis: | The electron waiting time is the time that passes between two subsequent charge transfers in an electronic conductor. Recently, theories of electron waiting times have been devised for quantum transport in Coulomb-blockade structures and for mesoscopic conductors, however, so far a proper description of a detector has been missing. Here we develop a quantum theory of a waiting time clock capable of measuring the distribution of waiting times between electrons above the Fermi sea in a mesoscopic conductor. The detector consists of a mesoscopic capacitor coupled to a quantum two-level system whose coherent precession we monitor. Under ideal operating conditions our waiting time clock recovers the results of earlier theories without a detector. We investigate possible deviations due to an imperfect waiting time clock. As specific applications we consider a quantum point contact with a constant voltage and lorentzian voltage pulses applied to an electrode. 12 pages, 6 figures |
Databáze: | OpenAIRE |
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