Realization of superconductivity in Group IV semiconductors could have a strong impact in the direction quantum technologies will take in the future. Therefore, it is imperative to understand the nature of the superconducting phases in materials such as Silicon and Germanium. Here, we report systematic synthesis and characterization of superconducting phases in hyperdoped Germanium prepared by Gallium ion implantation beyond its solubility limits. The resulting structural and physical characteristics have been tailored by changing the implantation energy and activation annealing temperature. Surprisingly, in addition to the poly-crystalline phase with weakly-coupled superconducting Ga clusters we find a nano-crystalline phase with quasi-2D characteristics consisting of a thin Ga film constrained near top surfaces. The new phase shows signatures of strong disorder such as anomalous B${\rm c}$ temperature dependence and crossings in magentoresistance isotherms. Apart from using hyperdoped Ge as a potential test-bed for studying signatures of quantum phase transitions (e.g. quantum Griffith singularity), our results suggest the possibility of integration of hyperdoped Ge nano-crystalline phase into superconducting circuits due to its 2D nature.
Buried germanium quantum well proximitised by magnetic field-resilient superconducting platinum iridium germanosilicide
Delft University of Technology（代尔夫特理工大学）；QuTech and Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学量子纳米科学夸夫泰克研究所）；Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学夸夫泰克纳米科学研究所）；Catalan Institute of Nanoscience and Nanotechnology – ICN2 (CSIC and BIST)（加泰罗尼亚纳米科学与技术研究所）；ICREA（加泰罗尼亚高级研究学院）
Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）；CEA（法国原子能和替代能源委员会）；IRIG-MEM-L_Sim；Quantum Advanced Research Center (QuARC) - Consejo Superior de Investigaciones Científicas (CSIC)（量子先进研究中心（QuARC）- 西班牙高等科学研究理事会（CSIC））；Instituto de Ciencia de Materiales de Madrid (ICMM) - Consejo Superior de Investigaciones Científicas (CSIC)（马德里材料科学研究所（ICMM）- 西班牙高等科学研究理事会（CSIC））
Center for Quantum Information Physics, New York University（纽约大学量子信息物理中心）；Department of Materials Science and Engineering, The Ohio State University（俄亥俄州立大学材料科学与工程系）
Tailoring Germanium Heterostructures for Quantum Devices with Machine Learning
QuTech and Kavli Institute of Nanoscience, Delft University of Technology（代尔夫特理工大学奎克研究所和卡弗里纳米科学研究所）；Department of Materials Science and Engineering, Delft University of Technology（代尔夫特理工大学材料科学与工程系）；Climate Safety and Security Centre, TU Delft The Hague Campus, Delft University of Technology（代尔夫特理工大学海牙校区气候安全与安保中心）
Voltage-tunable Josephson Junctions on Germanium Quantum Wells with in-situ Aluminum Contacts
Laboratory for Physical Sciences（物理科学实验室）；University of Maryland, College Park（马里兰大学帕克分校）；Department of Materials Science & Engineering, University of Maryland, College Park（马里兰大学帕克分校材料科学与工程系）；University of Arkansas（阿肯色大学）；Pacific Northwest National Laboratory（太平洋西北国家实验室）
Low-Noise Quantum Dots in Ultra-Shallow Ge/SiGe Heterostructures for Prototyping Hybrid Semiconducting-Superconducting Devices
Institute of Science and Technology Austria（奥地利科学与技术研究所）；Catalan Institute of Nanoscience and Nanotechnology – ICN2 (CSIC and BIST)（加泰罗尼亚纳米科学技术研究所（CSIC和BIST））
