Tag archives: condensed matter
By Sarah Tesh in New Orleans, Louisiana, US
After much coffee and a lot of crispy bacon, the second day of the APS March Meeting began. The hot topic of the day – metallic hydrogen. Even though we arrived 15 minutes early to Isaac Silvera‘s talk, the crowd was overflowing from the room, but despite all the pushing and shoving (my foot has not recovered from being stood on), we did manage to get seats. Silvera began by saying that he had been working on the problem for “probably longer than [most of us] were born” before taking us through the nearly 45 years of research on the subject. He also gave a press conference that included talks by theoretical physicists David Ceperley from the University of Illinois and Jeffrey McMahon from Washington State University. My colleague Tushna Commissariat caught up with Silvera later on, so be on the lookout for a more detailed update from her.
By Sarah Tesh and Tushna Commissariat in New Orleans, Louisiana, US
It is that time of the year again when around 10,000 physicists gather for the American Physical Society (APS) March Meeting and this year we’re in the Big Easy. While yesterday was a jetlag-recovery day, it’s all kicking off today at the sprawling Ernest Morial Convention Center, where more than 9600 papers will be presented during the week.
Despite our sleep-deprived state yesterday, we played the traditional game of “spot the physicist” during our wanderings in the French Quarter. This was made particularly interesting with the simultaneous game of “spot the spring-breakers”. Relaxed, youthful students chatting loudly about their late-night escapades were a stark contrast to academics looking anxious and lost while over-burdened with poster tubes, suitcases and laptop bags.
By Hamish Johnston
A popular way of melding science and art is to create an image of a mythical being in your lab. Yoshio Hayasaki and colleagues at Utsunomiya University in Japan have made a pretty good likeness of a mermaid using a laser that forms tiny bubbles inside a liquid. “In our display, the microbubble voxels are three-dimensionally generated in a liquid using focused femtosecond laser pulses,” explains team member Kota Kumagai.
By James Dacey in Beijing on Friday 4 November
After enjoying clear blue skies for the first couple of days of my visit to Beijing, the breeze has disappeared and the smog has taken its hold. One local scientist told me this latest wave is due to pollution from factories south-west of the city, but others have told me it is difficult to pinpoint a particular source. Facemasks are being worn by every other person in the streets, but fortunately I’ve been sheltered by the walls and ceilings of Peking University (PKU).
By Hamish Johnston in Beijing
This morning I had a wonderful visit to see some condensed-matter physicists at the Institute of Physics of the Chinese Academy of Sciences (IOP CAS). First I met with theorists Zhong Fang and Hongming Weng and if you know your equations you can see from the above photo that they work on Weyl semi-metals. Fang is deputy director of the institute and is head of a theoretical physics group that includes six faculty members and about 20 postgraduate students. Avid readers might recall that Fang and Weng were named in the Physics World Top 10 Breakthroughs of 2015 for their work on Weyl fermions.
By Matin Durrani in Beijing, China
The last couple of days in the Chinese capital have been unusually damp and cool for the middle of June. Today, however, dawned sparklingly sunny as I headed off with my colleague Mingfang Lu from the Beijing office of the Institute of Physics, which publishes Physics World, to the Beijing Computational Science Research Center (CSRC) on the outskirts of the city.
Located on a shiny new software park, this sleek, five-storey building opened in March last year and looks just how you might expect the headquarters of IKEA to be – all minimalist corridors, big glass windows and the odd work of art dotted around. There’s even a fitness room in the basement. It’s currently got 43 full-time faculty, a third of whom are physicists, making this 45,000 m2 building – roughly the size of seven football pitches – seem remarkably sparse.
By Michael Banks in Shenzhen, Guangdong province, China
It is well documented how China seems to be able to build cities within weeks. But how quickly could it build its very own Silicon Valley?
Well, that question may well be answered very soon. Today, I was at the South University of Science and Technology of China (SUSTC), which is located in Shenzhen, Guangdong province.
The university was only created in 2011 and currently the physics department has a sole focus on experimental and theoretical condensed-matter physics, with around 20 undergraduate students each year (that number is expected to rise as the department expands into other areas of physics).
By Tushna Commissariat in Baltimore, Maryland, US
One of the most popular talks this morning at the APS March meeting was almost certainly given by Nobel-prize-winning physicist Anthony Leggett of the University of Illinois at Urbana-Champaign in the US. Leggett, who shared the 2003 Nobel Prize for Physics for his work on superconductors and superfluids, talked about his “Reflections on the past present and future of of condensed-matter physics”.
As the abstract of his talk suggests, Leggett looked at the ways, means and even the very definition of “condensed-matter physics” has changed and “evolved since its inception in the early 20th century, with particular reference to its relationship to neighbouring and even distant disciplines”. He went on to “speculate on some possible directions in which the discipline may develop over the next few decades, emphasizing that there are still some very basic questions to which we currently have no satisfactory answers”.
I missed the beginning of his talk as I was attending the morning’s first set of press briefings (more on those later) but when I did walk into the packed hall for his talk, his slide had the rather interesting title: “Would I encourage my grandchildren to go into condensed-matter physics?” Happlily enough, his answer at the end of his talk was a resounding “yes”.
By Matin Durrani and Tushna Commissariat in Baltimore, Maryland, US
So here we are in Baltimore to attend the 2016 March meeting of the American Physical Society (APS). We’re writing this at the window seats in a burrito bar on Pratt Street while staring at the hulk that is the Baltimore Convention Center, where nigh-on 10,000 physicists will be congregating all week.
We’ve been playing a game of “spot the APS attendee” while tucking into our burritos. Without wishing to stereotype physicists (okay, go on then, we will) they’re the ones with the backpacks stuffed with poster tubes, pulling little trolley suitcases, looking lost before veering towards the convention centre.
There are also some physicists inside Chipotle Mexican Grill – you can tell because they’re huddled around laptops looking at PowerPoint presentations showing graphs of Fermi surfaces and topological insultators. Probably not the usual subject of discussion in here.
By Hamish Johnston
Condensed matter is a physicist’s paradise because of the seemingly endless number of ways that atoms can be rearranged to create systems with new and exciting behaviours. A great example of this is the emerging field of “valleytronics”, which is concerned with a property of electrons that emerges in some semiconductors and 2D materials such as graphene.
The eponymous valley is a local minimum in the conduction band of a solid that “traps” electrons into a specific momentum state. Things get interesting when a material has two valleys that result in two distinct momentum states. In some materials these states resemble the quantum-mechanical property of spin: an electron can be in one of two spin states (up or down) and it can also be in one of two momentum states. As a result, this property is sometimes referred to as valley pseudospin.