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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

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Quantum interferential Y-junction switch.

O A Tkachenko¹, V A Tkachenko, Z D Kvon

¹A V Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk, Russia. oatkach@gmail.com

|February 14, 2012

Summary

This summary is machine-generated.

We observed Fermi energy controlled electron flow redirection in a quantum dot system. This quantum interference effect, tunable by gate voltage, offers new possibilities for electron control in nanoscale devices.

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Area of Science:

Quantum physics
Mesoscopic physics
Condensed matter physics

Background:

Ballistic electron transport in nanoscale systems is crucial for future electronics.
Quantum dots offer a platform for controlling electron behavior at the quantum level.
Understanding electron flow redirection is key to designing novel electronic devices.

Purpose of the Study:

To investigate the Fermi energy controlled redirection of ballistic electron flow.
To analyze the behavior of a three-terminal quantum dot system.
To explore the influence of gate voltage and magnetic fields on electron transport.

Main Methods:

Fabrication of a 100 nm triangular quantum dot in a two-dimensional electron gas (2DEG).
Measurement of partial conductance coefficient differences (G(21) - G(23)) as a function of gate voltage.
Numerical simulations and theoretical analysis using quantum interference principles.

Main Results:

Observed strong, sign-changing oscillations in conductance difference with gate voltage in zero magnetic field.
Demonstrated Fermi energy controlled redirection of ballistic electron flow.
Showed that weak asymmetry or port inequality explains the observed quantum interference effect.

Conclusions:

Quantum interference in asymmetric quantum dots enables Fermi energy controlled electron flow redirection.
The effect is sensitive to gate voltage and can be modulated by magnetic fields.
This phenomenon provides a pathway for voltage-controlled electron routing in nanoscale devices.