He3-He4 dilution refrigerator for temperatures below 0.3 K down to <50 mK with optical access and installed magnet coil

我们申请了一台具有光学通道的稀释式制冷机，用于在50MK以下的基温下进行实验。此外，应能够施加强磁场或/和电场。这一系统将用于处理将受益于超低温的广泛科学项目，如：(A)激子精细结构的高分辨率光谱学；(B)极化电子或激子凝聚体等集体相的研究；(C)扩展纳米结构中载流子和自旋系统的动力学；(D)预计在极端冷却时将显示集体相的核自旋系统及其对载流子自旋动力学的影响；(E)在MK温度范围内具有相变的相关材料，特别是自旋液体；以及(F)在少数声子或单个声子的情况下的超快声学。

We apply for a dilution refrigerator with optical access for performing experiments at a base temperature below 50 mK. In addition, it shall be possible to apply high magnetic or/and electric fields. The system will be used to address a broad spectrum of scientific projects that would benefit from the ultralow temperatures such as (a) high resolution spectroscopy of excitonic fine structure; (b) study of collective phases such as polariton- or exciton condensates, (c) dynamics of carrier and spin systems in extended nanostructures; (d) nuclear spin systems expected to show collective phases at extreme cooling and their influence on the carrier spin dynamics; (e) correlated materials with phase transitions in the mK-temperature range, in particular spin liquids; as well as (f) ultrafast acoustics in the regime of a few phonons or a single phonon.