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南京大学超导电子学研究所研发新型“电热开关”超导二极管:突破实现全电控新路径

  • 2026-05-06 22:40:08
南京大学超导电子学研究所研发新型“电热开关”超导二极管:突破实现全电控新路径

在超导电子学领域，一项由南京大学、浙江大学及紫金山实验室联合完成的突破性研究，为低功耗、可编程的超导器件发展开辟了全新方向。研究团队成功研制出全球首款纳米级“电热开关”超导二极管，该器件通过微小栅极电流即可实现极性切换与开关控制，彻底摆脱了对外部磁场的依赖，为超导电路大规模集成与混合量子系统应用奠定了关键技术基础。成果以“Nanoscale Electrothermal Switch Superconducting Diode for Electrically Programmable Superconducting Circuits”为题，发表于国际知名期刊《Nano Letters》。

超导二极管：量子时代的“单向阀门”

超导二极管的核心功能在于实现超导电流的非互易传输——电流沿某一方向可零电阻通过，反向则被显著抑制。这一特性使其成为构建极低功耗超导电路的核心元件，尤其在量子计算、神经形态计算等前沿领域，其单向导电性可有效减少信号干扰，提升系统稳定性。然而，传统超导二极管的设计存在根本性局限：多数器件依赖异质结结构或精密界面工程实现非互易性，且需通过外部磁场调控极性。这种设计不仅增加了器件制造的复杂性，更导致局部控制能力缺失——磁场调控会同时影响电路中所有器件，难以实现单个元件的独立操作，从而严重制约了超导电路的集成密度与规模化应用。

电热驱动：从磁场依赖到电流操控的范式转变

研究团队从超导纳米低温管（nTron）的电热效应中获得灵感，创新性地提出以电热效应替代磁场调控的方案。他们设计了一种四端口铌氮（NbN）超导纳米线结构，通过栅极施加微小电流即可局部改变纳米线的温度分布，进而动态调控其超导态与正常态的相变过程。这一机制实现了三个关键突破：首先，器件极性切换完全由电信号控制，无需外部磁场，大幅简化了系统设计；其次，四端口结构支持正向全波整流、反向全波整流及半波整流等多种模式，通过电学指令即可实时重构电路功能；最后，器件与现有光刻工艺完全兼容，为大规模制造提供了可行性。
实验数据显示，该超导二极管在1.8开尔文的低温环境下表现出优异的非互易性：正向电流通过时电阻接近零，反向电流则被抑制超过90%。更关键的是，通过调节栅极电流强度，器件可在毫秒级时间内完成模式切换，且切换次数超过千万次仍保持性能稳定。这种动态可重构能力，使得单个器件即可替代传统电路中多个固定功能的元件，显著提升了电路设计的灵活性。

技术突破：微观物理机制与工程实现的双重创新

研究团队通过系统实验揭示了电热驱动非互易性的微观机制：栅极电流引起的局部加热会改变纳米线中超导涡旋的分布状态，形成方向依赖的势垒，从而产生单向导电性。这一发现不仅完善了超导非互易性的理论框架，更为器件优化提供了明确方向——通过调整纳米线宽度、栅极位置等参数，可精确调控器件的工作温度范围与响应速度。
在工程实现层面，团队攻克了纳米级超导结构的加工难题。铌氮材料在纳米尺度下易出现晶界缺陷，导致超导性能退化。研究人员通过优化溅射沉积工艺与退火条件，成功制备出宽度仅80纳米的超导纳米线，其临界电流密度达到每平方厘米1.2兆安培，接近理论极限值。此外，四端口结构的封装设计有效隔离了栅极电流与主电流路径，避免了信号串扰，确保了器件的高信噪比操作。

应用前景：从超导逻辑到量子计算的广阔空间

这款电热开关超导二极管的问世，为多个前沿领域带来了变革性可能。在高能效超导逻辑电路方面，其动态可重构特性可支持电路功能的实时编程，例如通过电信号切换实现加法器与乘法器的功能转换，从而构建更紧凑、更节能的超导处理器。在神经形态计算领域，器件的非线性响应特性与突触可塑性高度契合，有望用于模拟人脑的并行信息处理模式。
更引人注目的是，该技术为可重构量子信息系统提供了核心元件。量子比特的操作与读取需要精确控制超导电路的信号流向，传统固定功能的二极管难以满足动态调控需求。而电热开关超导二极管可通过电信号快速重构量子电路拓扑，为实施量子纠错、量子门操作等复杂任务提供了灵活工具。研究团队已初步演示了基于该器件的量子比特读取电路，其信号保真度超过99%，验证了技术可行性。

产业推进：从实验室到应用场的最后一公里

目前，研究团队正与半导体制造企业合作，推进器件的12英寸晶圆级兼容性测试。初步结果显示，采用标准光刻工艺制备的器件性能与实验室样品一致，且良率超过95%。这一进展意味着，该技术有望在3至5年内实现商业化落地。
这项研究得到了“量子通信与量子计算机”国家科技重大项目、国家重点研发计划等资金支持。随着材料科学与低温电子技术的持续进步，完全由电信号编程的超导处理器芯片或许将不再遥远。届时，计算设备的能耗将降低数个数量级，而量子计算机的实用化进程也将大幅提速——这或许正是超导电子学领域迈出的关键一步。
DOI：10.1021/acs.nanolett.6c00080
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  1. CONNECT:[ UseTime:0.000933s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001591s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000613s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000613s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001260s ]
  6. SELECT * FROM `set` [ RunTime:0.000518s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001526s ]
  8. SELECT * FROM `article` WHERE `id` = 554567 LIMIT 1 [ RunTime:0.001663s ]
  9. UPDATE `article` SET `lasttime` = 1778080766 WHERE `id` = 554567 [ RunTime:0.003877s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000735s ]
  11. SELECT * FROM `article` WHERE `id` < 554567 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003162s ]
  12. SELECT * FROM `article` WHERE `id` > 554567 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001541s ]
  13. SELECT * FROM `article` WHERE `id` < 554567 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016513s ]
  14. SELECT * FROM `article` WHERE `id` < 554567 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.009844s ]
  15. SELECT * FROM `article` WHERE `id` < 554567 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008085s ]
0.220556s