公开(公告)号：US20230099931A1

公开(公告)日：2023-03-30

申请号：US17642706

申请日：2021-01-05

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaomin CHENG ,  Han LI ,  Yuntao ZENG ,  Yunlai ZHU ,  Xiangjun LIU ,  Xiangshui MIAO

IPC: H01L47/00

Abstract: A phase change memory device based on a nano current channel is provided. A nano current channel layer structure is adopted and configured to limit the current channel. As such, when flowing through the layer, the current enters the phase change layer from nano crystal grains with high electrical conductivity, and the current is thereby confined in the nano current channels. By using the nano-scale conductive channels, the contact area between the phase change layer and the electrode layer is significantly decreased, the current density at local contact channel is significantly increased, and heat generation efficiency of the current in the phase change layer is improved. Moreover, an electrically insulating and heat-insulating material with low electrical conductivity and low thermal conductivity prevents heat in the phase change layer from being dissipated to the electrode layer, and Joule heat utilization efficiency of the phase change layer is thereby improved.

公开(公告)号：US20240319563A1

公开(公告)日：2024-09-26

申请号：US18577702

申请日：2021-09-07

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaomin CHENG ,  Zhuli HE ,  Yunlai ZHU ,  Han LI ,  Xiangshui MIAO

IPC: G02F3/02 ,  G11C13/00 ,  H03K19/173

CPC classification number: G02F3/022 ,  G11C13/0004 ,  H03K19/173

Abstract: A Y-branch type phase-change all-optical Boolean logic device comprises a waveguide of a Y-branch structure and phase change function units covered over the waveguide. In the logic implementation method, a light pulse having a large power is employed to perform a write operation on the phase change function unit, so that the phase change function unit is heated to generate a crystallization or amorphization phase change, thereby causing a difference in optical properties under two states; the state of the phase change function unit is read by employing a light pulse having a small power, and the state of its phase change material is not changed. By defining input logic signals respectively and defining three operation steps, an operation mode reconfigurable logic can be implemented, and all 16 binary Boolean logic calculations are implemented in a simple structure by means of step-by-step operation.

公开(公告)号：US20230221619A1

公开(公告)日：2023-07-13

申请号：US17910835

申请日：2021-07-22

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaomin CHENG ,  Zhuli HE ,  Yunlai ZHU ,  Han LI ,  Xiangshui MIAO

IPC: G02F3/00

CPC classification number: G02F3/00 ,  G02F2201/307 ,  G02F2203/50 ,  G02F2203/11

Abstract: The disclosure provides a straight waveguide phase change all-photonic Boolean logic device and a full binary logic implementation method thereof, including a straight waveguide structure, a phase change functional unit covered on top of a waveguide and a protective layer thereof, and a waveguide Bragg grating structure. In terms of the logic implementation method, optical pulses are respectively input from two ends of the device to modulate the state of the phase change functional unit. The parameters of the waveguide Bragg grating structure are set to reflect the wavelength of the pump optical pulse, so that write pulses input from the two ends only act on the phase change functional unit closest to that end. A probe optical pulse with a specific wavelength is selected, and the probe light under the wavelength is less reflected by the waveguide Bragg grating and does not affect the reading of the state of the device. The disclosure has advantages such as anti-electromagnetic interference and parallel operation. Functions of 16 types of binary Boolean logic operation are implemented, which greatly improves the work efficiency of logic operation.