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首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Exchange interaction effects in the thermodynamic properties of quantum dots
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Exchange interaction effects in the thermodynamic properties of quantum dots

机译:交换相互作用对量子点热力学性质的影响

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摘要

We study electron-electron interaction effects in the thermodynamic properties of quantum-dot systems. We obtain the direct and exchange contributions to the specific heat C_υ in the self-consistent Hartree-Fock approximation at finite temperatures. An exchange-induced phase transition is observed and the transition temperature is shown to be inversely proportional to the size of the system. The exchange contribution to C_υ dominates over the direct and kinetic contributions in the intermediate regime of interaction strength (r_s ~ 1). Furthermore, the electron-electron interaction modifies both the amplitude and the period of magnetic field-induced oscillations in C_υ.
机译:我们研究了量子点系统热力学性质中的电子-电子相互作用效应。我们在有限温度下以自洽的Hartree-Fock逼近法获得比热C_υ的直接贡献和交换贡献。观察到交换引起的相变,并且显示出转变温度与系统的大小成反比。对C_υ的交换贡献主要在相互作用强度的中间状态(r_s〜1)中的直接和动力学贡献上。此外,电子-电子相互作用会改变C_υ中磁场感应振荡的幅度和周期。

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