Detecting terahertz current fluctuations in a quantum point contact using a nanowire quantum dot

2008/05/09 by S. Gustavsson, Simon Gustavsson, I. Shorubalko +7
Physics and Astronomy · #Condensed matter physics #Laser #Nanowire #Open quantum system #Optoelectronics #Phonon #Photon #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum dot laser #Quantum mechanics #Quantum point contact #Quantum sensor #Quantum technology #Quantum well #Semiconductor #Semiconductor Quantum Structures and Devices #Terahertz radiation #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.78.035324

published as Phys. Rev. B 78, 035324 (2008)

arxiv created 2008/05/09 · openalex publication_date 2008/07/22 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We use a nanowire quantum dot to probe high-frequency current fluctuations in a nearby quantum point contact. The fluctuations drive charge transitions in the quantum dot, which are measured in real-time with single-electron detection techniques. The quantum point contact (GaAs) and the quantum dot (InAs) are fabricated in different material systems, which indicates that the interactions are mediated by photons rather than phonons. The large energy scales of the nanowire quantum dot allow radiation detection in the long-wavelength infrared regime.

Citations

• Discrete charging of traps visualized by scanning gate experiments on a quantum point contact
• Fano Factor Reduction on the 0.7 Conductance Structure of a Ballistic One-Dimensional Wire
• Experimental Test of the High-Frequency Quantum Shot Noise Theory in a Quantum Point Contact
• Allowed and forbidden transitions in artificial hydrogen and helium atoms
• Current measurement by real-time counting of single electrons
• Double-Dot Quantum Ratchet Driven by an Independently Biased Quantum Point Contact
• PROTECTIVE EFFECT OF LEYK ON LEUCOPENIA DURING RADIOTHERAPY.
• Differential Charge Sensing and Charge Delocalization in a Tunable Double Quantum Dot
• Single-shot read-out of an individual electron spin in a quantum dot