Fast Thermodynamic Study on a Silicon Nanotransistor at Cryogenic Temperatures

Area of Science:

• Quantum Computing
• Nanoscale Thermodynamics
• Semiconductor Physics

Background:

• Quantum electronic devices require cryogenic temperatures for operation.
• Microwave and laser signals induce nanoscale heating, affecting device performance.
• Accurate temperature probing is essential for designing quantum computers.

Purpose of the Study:

• To demonstrate high-sensitivity, fast thermometry in silicon nanotransistors at cryogenic temperatures.
• To investigate thermodynamic processes and heat dissipation in nanotransistors under operational conditions.
• To provide insights into thermal budgets for quantum circuits.

Main Methods:

• Utilized radio frequency (RF) reflectometry for thermometry.
• Applied laser pulses to induce controlled heating.
• Analyzed thermodynamic responses during and after laser excitation.

Main Results:

• Achieved high-sensitivity and fast temperature measurements at the nanoscale.
• Identified dominant heat dissipation channels in the few-kelvin range.
• Characterized thermodynamic behavior of the nanotransistor.

Conclusions:

• Fast thermometry is feasible for quantum devices under cryogenic conditions.
• Understanding nanoscale heat dissipation is critical for quantum circuit design.
• The developed technique is versatile for studying various quantum electronic devices.