Related Experiment Video
Updated: Mar 26, 2026
11:33
All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
10.4K
Voltage Quench Dynamics of a Kondo System
Andrey E Antipov1, Qiaoyuan Dong1, Emanuel Gull1
1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.
Physical Review Letters
|February 6, 2016
Summary
We studied quantum dot behavior after a voltage change. Current quickly stabilizes and shows Kondo physics, with saturation temperature revealing insights into transient and steady states.
Area of Science:
- Condensed matter physics
- Quantum electronics
- Mesoscopic physics
Background:
- Correlated quantum dots are crucial in nanoscale electronics.
- Understanding mixed valence regimes is key for device applications.
- Kondo physics governs low-temperature behavior in quantum dots.
Purpose of the Study:
- Investigate quantum dot current dynamics after a voltage quench.
- Analyze the influence of temperature on transient and steady-state currents.
- Characterize the time-dependent Kondo temperature.
Main Methods:
- Numerically exact calculations of quantum dot current.
- Simulations performed across a wide range of initial temperatures.
- Analysis of current response to rapid bias voltage application (quantum quench).
Main Results:
- Observed short equilibration times for the current.
- Current saturation at low temperatures, indicating Kondo behavior.
- Identified a time-dependent current saturation temperature linked to Kondo temperature.
Conclusions:
- Kondo physics is present in both transient and steady states of quantum dots.
- The time-dependent saturation temperature provides experimental signatures.
- Results offer insights into quantum dot dynamics beyond linear response.
Related Concept Videos
01:12Fermi Level Dynamics
962
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
962
02:42Valence Bond Theory
11.6K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.6K
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.4K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
1.4K
01:14RL Circuit without Source
2.5K
When a DC source is suddenly disconnected from an RL (Resistor-Inductor) circuit, the circuit becomes source-free. Assuming the inductor has an initial current denoted as I0, the initial energy stored in the inductor can be determined.
Applying Kirchhoff's voltage law around the loop of the circuit and substituting the voltages across the inductor and resistor yields a first-order differential equation. A logarithmic equation is obtained by rearranging the terms in this equation,...
Applying Kirchhoff's voltage law around the loop of the circuit and substituting the voltages across the inductor and resistor yields a first-order differential equation. A logarithmic equation is obtained by rearranging the terms in this equation,...
2.5K
01:21Electrical Systems
915
In electrical engineering, the analysis of networks composed of passive linear components — resistors (R), capacitors (C), and inductors (L) — is fundamental. These components are organized into circuits where the relationship between input and output can be analyzed using transfer functions. The transfer function of an RLC circuit, which relates the voltage across a capacitor to the input voltage, can be derived using Kirchhoff's laws.
To derive the transfer function, consider an RLC...
To derive the transfer function, consider an RLC...
915
02:54Trends in Lattice Energy: Ion Size and Charge
27.2K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
27.2K