Our faculty members publish their works in prestigious research journals. Take a look at what we have been working on here.
Department Highlights
New chips accelerate data transmission
14 July 2020A physicist from City University of Hong Kong (CityU) has played a pivotal role in advancing data transmission speed on the internet to make it the fastest in the world.
Such speed will facilitate downloading 1,000 high-definition movies in less than a second, according to the international team that undertook the research.
World’s first experimental observation of the Kondo cloud
13 Mar 2020Physicists have been trying to observe the quantum phenomenon Kondo cloud for many decades.
Full story
Fast-track PhD Admission (2020 autumn entry) 2020秋季入學全獎PhD申請快速通道
5 Jun 2020To facilitate the PhD application of students who are not able to study aboard due to the COVID-19 pandemic, the Department of Physics now offers a special fast-track arrangement for PhD admission (2020 autumn entry).
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Low-dimensional Systems
Low-dimensional Systems
Observation of the Kondo screening cloud
Nature
In research published in Nature, an international research group has ended a fifty-year quest by directly observing a quantum phenomenon known as a Kondo screening cloud. This phenomenon, which is important for many physical phenomena such as high-temperature superconductivity, is essentially a cloud that masks magnetic impurities in a material. It was known to exist but its spatial extension had never been experimentally observed, creating controversy over whether such an extension actually existed.
Read more at Nature:
https://www.nature.com/articles/s41586-020-2058-6
The paper has also featured in CityU Research:
https://www.cityu.edu.hk/research/stories/2020/03/12/worlds-first-experimental-observation-kondo-cloud
11 Mar 2020
Atomic, Molecular, and Optical Physics
Applied Physics
Atomic, Molecular, and Optical Physics
Applied Physics
Ultra-dense optical data transmission over standard fibre with a single chip source
Nature Communications
Optical micro-combs are tiny optical structures that convert a single laser into many different wavelengths of light. These devices have been used in a wide range of exciting demonstrations, including optical communications. The key to micro-combs are optical resonator structures, tiny rings (see picture) that when hit with enough light convert the incoming single wavelength into a precise rainbow of wavelengths. This work uses a novel kind of micro-comb called a “solition crystal”, that produces 80 separate wavelengths of light that can carry different signals at the same time. To prove the micro-comb could be used in a real-world environment, we transmitted the data through installed optical fibres in Melbourne (provided by AARNet) between RMIT’s City campus and Monash’s Clayton campus and back, for a round trip of 75 kilometres and demonstrated data transmission at > 40 Tbps. A world record in terms of spectral efficiency on a standard optical fiber.
Read more at Nature Communications:
https://www.nature.com/articles/s41467-020-16265-x
The paper has featured in CityU Research News:
https://www.cityu.edu.hk/media/news/2020/07/06/new-chips-accelerate-data-transmission
The paper has also featured in CityU Research Stories:
https://www.cityu.edu.hk/research/stories/2020/07/02/new-chips-developed-cityu-physicist-help-break-spectral-efficiency-record-optical-data-transmission
Please click the following links for media coverage:
- Australia 'records fastest internet speed ever' [BBC News] 2020-05-22 Technology
- 'Fastest ever' internet speed capable of downloading 1,000 HD movies in under a second is recorded in Australia - and it is four million times faster than the country's average connection [Daily Mail] 2020-05-22 Science & Tech
- Internet traffic is growing 25% each year. We created a fingernail-sized chip that can help the NBN keep up [The Conversation] 2020-05-22 Science & Technology
- World's fastest internet speed from a single optical chip [Science Daily] 2020-05-22 Science News
- Un record de débit Internet atteint par des scientifiques australiens [Radio-Canada] 2020-05-23 Techno
- 云爾錄 :城大研超快芯片 1秒下載千套戲 [Hong Kong Economic Journal] 2020-07-06 A16 獨眼香江 獨眼香江 紀曉風
- 城大研高速晶片傳輸速度全球最快 [Sing Tao Daily] 2020-07-06 F01 教育
- 城大研芯片 少於1秒下載千部高清電影 [Hong Kong Economic Times] 2020-07-06 A18 港聞
- 城大研新型芯片 一秒內下載千套戲 [Oriental Daily News] 2020-07-06 A13 港聞
- 1秒下載千套高清電影 城大研新芯片 網速升至史上最快 [Sky Post] 2020-07-06 P08 港聞
- 城大研新型芯片 1 秒下載千部電影 [Hong Kong Commercial Daily] 2020-07-06 A09 香港新聞
- 城大新芯片1 秒下載千部高清戲 [Lion Rock Daily] 2020-07-06 P07 港聞
- 城大研究高速晶片 傳輸速度全球最快 [BASTILLE POST] 2020-07-06
- 城大研高速晶片 傳輸速度全球最快 [Headline Daily online] 2020-07-06
- 1秒下載千套高清電影 城大研新芯片 網速升至史上最快 [HKET online] 2020-07-06
- CityU scholars develops new data chips [OpenGov Asia] 2020-07-08 Digital Transformation
22 May 2020
Education
Our Programmes
We aim to equip our students with knowledge and critical thinking skills that benefit them in physical-science-related careers and beyond. Explore our programmes below!
