Related Experiment Video
Updated: Apr 30, 2026
11:03
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
7.6K
Two-level system in spin baths: non-adiabatic dynamics and heat transport
1Chemical Physics Theory Group, Department of Chemistry, University of Toronto, 80 Saint George St., Toronto, Ontario M5S 3H6, Canada.
The Journal of Chemical Physics
|May 3, 2014
Summary
This study explores non-adiabatic spin dynamics and heat current in a two-state system coupled to spin baths. The spin-spin-bath model shows unique thermal diode effects, outperforming spin-boson models at intermediate-strong coupling.
Area of Science:
- Quantum thermodynamics
- Condensed matter physics
- Non-adiabatic dynamics
Background:
- Investigating quantum systems interacting with their environment is crucial for understanding energy transport.
- Spin baths offer a unique platform to study quantum dynamics and thermalization.
- Non-adiabatic effects play a significant role in quantum transport phenomena.
Purpose of the Study:
- To derive an exact analytic expression for the memory kernel in a two-state subsystem coupled to a spin bath.
- To analyze the heat current characteristics of a spin-spin-bath model out-of-equilibrium.
- To compare the thermal diode effect in spin-spin-bath and spin-boson models.
Main Methods:
- Utilizing the non-interacting blip approximation for non-adiabatic dynamics.
- Deriving an exact analytic expression for the memory kernel.
- Analyzing heat current in a two-state subsystem bridging two thermal spin baths.
Main Results:
- The derived memory kernel reduces to known results in the thermodynamic limit.
- The spin-spin-bath model exhibits distinct heat current behavior compared to spin-boson models.
- The thermal diode effect is absent at weak coupling but prominent in the intermediate-strong coupling regime for the spin-spin-bath model.
Conclusions:
- The non-interacting blip approximation provides an accurate method for studying spin bath dynamics.
- The spin-spin-bath model presents a novel platform for exploring thermal transport and rectification.
- The coupling strength significantly influences the thermal diode performance in quantum systems.
More Related Videos
06:34In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging
Published on: September 2, 2016
5.8K
11:44Spin Saturation Transfer Difference NMR SSTD NMR: A New Tool to Obtain Kinetic Parameters of Chemical Exchange Processes
Published on: November 12, 2016
19.6K
Related Concept Videos
01:28Atomic Nuclei: Types of Nuclear Relaxation
1.1K
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
1.1K
01:14Atomic Nuclei: Nuclear Spin State Population Distribution
1.7K
Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
1.7K
01:20Mechanisms of Heat Transfer II
4.5K
In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
4.5K
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.1K
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.
1.1K
01:14Mechanisms of Heat Transfer I
5.8K
Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
5.8K
01:03Atomic Nuclei: Nuclear Spin State Overview
1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K