首页|Fermi level tuning in Sn1-xPbxTe/Pb heterostructure via changing interface roughness

Fermi level tuning in Sn1-xPbxTe/Pb heterostructure via changing interface roughness

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Superconducting SnTe-type topological crystalline insulators(TCIs)are predicted to host multiple Majorana zero modes(MZMs)which can coexist in a single vortex.Fermi level(FL)close to the Dirac points of topological surface states is helpful for detecting MZMs.However,the TCI SnTe is a heavily p-type semiconductor which is very difficult to modify to n-type via doping or alloying.In this work,we fabricate the atomically flat Sn1-xPbxTe/Pb heterostructure by molecular beam epitaxy,and make the p-type Sn1-xPbxTe become n-type through changing the interface roughness.Using scanning tunnelling microscope,we find the Dirac points of Sn1-xPbxTe/Pb heterostructure are always above the FL due to the Fermi level pinning(FLP)induced by topological surface states at atomically flat interface.After increasing the interface roughness,the FLP effect is suppressed and then the Dirac points of p-type Sn1.xPbxTe can be tuned very close to or even below the FL.Our work provides a new method for tuning the FL of SnTe-type TCI which has potential application in novel topological superconductor device.

topological crystalline insulatorsuperconductorheterostructureFermi level pinninginterface roughness

Tengteng Liu、Zhaoxia Yi、Bangjin Xie、Weiyan Zheng、Dandan Guan、Shiyong Wang、Hao Zheng、Canhua Liu、Hao Yang、Yaoyi Li、Jinfeng Jia

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Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education),Tsung-Dao Lee Institute,School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

Hefei National Laboratory,Hefei 230088,China

Ministry of Science and Technology of ChinaMinistry of Science and Technology of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of Chinese Academy of SciencesScience and Technology Commission of Shanghai MunicipalityScience and Technology Commission of Shanghai MunicipalityScience and Technology Commission of Shanghai MunicipalityInnovation program for Quantum Science and TechnologyChina National Postdoctoral Program for Innovative Talents

2019YFA03086002020YFA03090001186116100312104293923653022232520392265105920652011207424712174252XDB280000002019SHZDZX0119JC141270120QA14051002021ZD0302500BX2021185

2024

10.1007/s11433-024-2383-6

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(8)