Partially separated Majorana modes in a disordered medium
Partially separated Majorana modes in a disordered medium
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无序介质中部分分离的马约拉纳模式
DOI：
10.1103/physrevb.105.205122
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发表时间：
2022
影响因子：
3.7
通讯作者：
Stanescu, Tudor
中科院分区：
文献类型：
--
作者：
Zeng, Chuanchang;Sharma, Girish;Tewari, Sumanta;Stanescu, Tudor
着眼于最近关于半导体-超导体(SM-SC)异质结中Majorana零模的实验结果，我们批判性地考察了零偏置微分电导的量子化，这是在无序存在的情况下Majorana物理的一个可能的明确特征。通过数值计算不同无序实现方式下零偏置电导(ZBC)随塞曼分裂和化学势的变化关系，我们发现与清洁系统相关的大的拓扑区随着无序强度的增加而分裂成逐渐变小的“岛”，该拓扑区以量子化的ZBC高度为特征。对于强无序，我们表明ZBC值(大约)等于的小岛的存在，我们称为“量子化岛”，代表了Majorana物理支持部分分离的Majorana模(PS-MMS)的独特特征。由于这些量化孤岛在参数空间中的面积/体积很小，在实验中观察它们可能需要样本选择和在控制参数空间中对大体积的系统扫描。当无序度减小时，量子化岛的大小增加，并最终合并成大的拓扑区。我们的结论是，观测到的ZBC值近似等于的量子化岛屿明确地证明了Majorana物理所必需的关键成分的存在，为评估无序强度提供了一个极好的诊断工具，因此，代表着Majorana搜索的下一个自然里程碑。
Focusing on the implications of recent experiments on Majorana zero modes in semiconductor-superconductor (SM-SC) heterostructures, we critically examine the quantization of the zero-bias differential conductance as a possible unambiguous signature of Majorana physics in the presence of disorder. By numerically calculating the zero-bias conductance (ZBC) maps as function of Zeeman splitting and chemical potential for different disorder realizations, we find that the large topological region associated with the clean system, which is characterized by a quantized ZBC height, breaks up into progressively smaller “islands” as the disorder strength increases. For strong disorder we show that the presence of small islands with ZBC value (approximately) equal to, which we refer to as “quantized islands,” represents a unique signature of Majorana physics supporting partially separated Majorana modes (ps-MMs). Because of the small area/volume of these quantized islands in the parameter space, observing them in experiments may require sample selection and the systematic scanning of a large volume in the control parameter space. Upon decreasing disorder, the quantized islands increase in size and eventually coalesce into large topological regions. We conclude that the observation of quantized islands with ZBC value approximately equal todemonstrates unambiguously the presence of the key ingredients necessary for Majorana physics, provides an excellent diagnostic tool for evaluating the disorder strength, and, consequently, represents the next natural milestone in Majorana search.
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影响因子：
56.9
作者：
Vaitiekenas, S.;Winkler, G. W.;Marcus, C. M.
通讯作者：
Marcus, C. M.
InAs/GaAs 量子点太阳能电池中的绝对发射光谱：电压偏压依赖性
DOI：
--
发表时间：
2020
期刊：
影响因子：
--
作者：
玉置亮;庄司靖;Jean-Francois Guillemoles;岡田至崇
通讯作者：
岡田至崇
影响因子：
56.9
作者：
Valentini, Marco;Penaranda, Fernando;Katsaros, Georgic
通讯作者：
Katsaros, Georgic
影响因子：
3.7
作者：
B. Woods;T. Stanescu
通讯作者：
B. Woods;T. Stanescu
混合马约拉纳纳米线中的电荷杂质效应
影响因子：
4.6
作者：
Woods, Benjamin D.;Das Sarma, Sankar;Stanescu, Tudor D.
通讯作者：
Stanescu, Tudor D.