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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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¹H NMR Signal Multiplicity: Splitting Patterns01:13

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When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Magnetic Field Tuning and Quantum Interference in a Cooper Pair Splitter.

G Fülöp1, F Domínguez2, S d'Hollosy3

  • 1Department of Physics, Budapest University of Technology and Economics, and Condensed Matter Research Group of the Hungarian Academy of Sciences, Budafoki út 8, 1111 Budapest, Hungary.

Physical Review Letters
|December 10, 2015
PubMed
Summary
This summary is machine-generated.

Cooper pair splitting (CPS) uses quantum dots to separate electron pairs from superconductors. An external magnetic field tunes the conductance correlations, optimizing CPS device performance and demonstrating coherent electron propagation.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Cooper pair splitting (CPS) is a fundamental quantum mechanical process.
  • CPS utilizes quantum dots to spatially separate entangled electrons from a superconductor.

Purpose of the Study:

  • Investigate the evolution of conductance correlations in an InAs CPS device under an external magnetic field.
  • Understand the role of local and nonlocal transport processes in shaping the observed signals.

Main Methods:

  • Experimental measurements of gate dependence of conductance correlations in an InAs CPS device.
  • Theoretical modeling using a three-site model to interpret experimental observations.

Main Results:

  • Observed continuous evolution of the signal from asymmetric Lorentzian to Fano-type resonance with increasing magnetic field.
  • Demonstrated that nonlocal CPS yields symmetric line shapes, while local transport exhibits asymmetry due to quantum interference.
  • Showcased coherent propagation of electrons after emission from the superconductor.

Conclusions:

  • External magnetic fields can effectively tune and optimize the performance of CPS devices.
  • The study provides insights into the coherent nature of electron transport post-CPS.
  • Experimental efficiency estimates represent a lower bound of the actual CPS efficiency.