Six Flux Composite Fermions

A team of physicists at Purdue University has discovered a new particle, the six-flux composite fermion, expanding the understanding of the fractional quantum Hall effect beyond the known two-flux and four-flux states. This significant finding highlights the critical role of high-quality semiconductor materials and supports the advancement of quantum physics research.

If the fractional quantum Hall regime were a series of highways, these highways would have either two or four lanes. The flow of the two-flux or four-flux composite fermions, like automobiles in this two- to four-flux composite fermion traffic scenario, naturally explains the more than 90 fractional quantum Hall states that form in a large variety of host materials.

Physicists at Purdue University have recently discovered, though, that fractional quantum Hall regimes are not limited to two-flux or four-flux and have discovered the existence of a new type of emergent particle, which they are calling six-flux composite fermion. They have recently published their groundbreaking findings in Nature Communications.    READ MORE...

Our Understanding of Distance

The researchers discovered that a new theoretical framework to unify Hermitian and 

non-Hermitian physics is established by the duality between non-Hermiticity and curved spaces.

According to traditional thinking, distorting a flat space by bending it or stretching it is necessary to create a curved space. A group of scientists at Purdue University has developed a new technique for making curved spaces that also provides the answer to a physics mystery. 

The team has developed a method using non-Hermiticity, which occurs in all systems coupled to environments, to build a hyperbolic surface and a number of other prototypical curved spaces without causing any physical distortions of physical systems.

“Our work may revolutionize the general public’s understanding of curvatures and distance,” says Qi Zhou, Professor of Physics and Astronomy.

“It has also answered long-standing questions in non-Hermitian quantum mechanics by bridging non-Hermitian physics and curved spaces. These two subjects were assumed to be completely disconnected. 

The extraordinary behaviors of non-Hermitian systems, which have puzzled physicists for decades, become no longer mysterious if we recognize that the space has been curved. 

In other words, non-Hermiticity and curved spaces are dual to each other, being the two sides of the same coin.”

The team’s results were published in the journal Nature Communications in an article titled “Curving the Space by Non-Hermiticity.” Most of the team’s members are employed at Purdue University’s West Lafayette campus. 

The Purdue team is made up of Professor Qi Zhou, Zhengzheng Zhai, a postdoctoral researcher, with graduate student Chenwei Lv serving as the primary author. Professor Ren Zhang from Xi’an Jiaotong University, who is a co-first author of the paper, was a visiting scholar at Purdue when the study was originally started.  READ MORE...

Taking a Giant Leap

ORNL’s Joseph Lukens runs experiments in an optics lab. Credit: Jason Richards/ORNL, U.S. Dept. of Energy

Scientists' increasing mastery of quantum mechanics is heralding a new age of innovation. Technologies that harness the power of nature's most minute scale show enormous potential across the scientific spectrum, from computers exponentially more powerful than today's leading systems, sensors capable of detecting elusive dark matter, and a virtually unhackable quantum internet.

Researchers at the Department of Energy's Oak Ridge National Laboratory, Freedom Photonics and Purdue University have made strides toward a fully quantum internet by designing and demonstrating the first ever Bell state analyzer for frequency bin coding.

Their findings were published in Optica.

Before information can be sent over a quantum network, it must first be encoded into a quantum state. This information is contained in qubits, or the quantum version of classical computing "bits" used to store information, that become entangled, meaning they reside in a state in which they cannot be described independently of one another.

Entanglement between two qubits is considered maximized when the qubits are said to be in "Bell states."

Measuring these Bell states is critical to performing many of the protocols necessary to perform quantum communication and distribute entanglement across a quantum network. And while these measurements have been done for many years, the team's method represents the first Bell state analyzer developed specifically for frequency bin coding, a quantum communications method that harnesses single photons residing in two different frequencies simultaneously.  READ MORE...

Witest White Paint

The whitest paint in the world has been created in a lab at Purdue University, a paint so white that it could eventually reduce or even eliminate the need for air conditioning, scientists say.

The paint has now made it into the Guinness World Records book as the whitest ever made.

So why did the scientists create such a paint? It turns out that breaking a world record wasn't the goal of the researchers: Curbing global warming was.

“When we started this project about seven years ago, we had saving energy and fighting climate change in mind,” said Xiulin Ruan, a professor of mechanical engineering at Purdue, in a statement.

The idea was to make a paint that would reflect sunlight away from a building, researchers said.  READ MORE

Critical Race Theory

Critical race theory (CRT) is an academic movement made up of civil-rights scholars and activists in the United States who seek to critically examine the law as it intersects with issues of race, and to challenge mainstream liberal approaches to racial justice.  Wikipedia

According to Purdue University
Critical Race Theory (1970s-present)
INTRODUCTION
Critical Race Theory, or CRT, is a theoretical and interpretive mode that examines the appearance of race and racism across dominant cultural modes of expression. In adopting this approach, CRT scholars attempt to understand how victims of systemic racism are affected by cultural perceptions of race and how they are able to represent themselves to counter prejudice.

Closely connected to such fields as philosophy, history, sociology, and law, CRT scholarship traces racism in America through the nation’s legacy of slavery, the Civil Rights Movement, and recent events. In doing so, it draws from work by writers like Sojourner Truth, Frederick Douglass, W.E.B. Du Bois, Martin Luther King, Jr., and others studying law, feminism, and post-structuralism. CRT developed into its current form during the mid-1970s with scholars like Derrick Bell, Alan Freeman, and Richard Delgado, who responded to what they identified as dangerously slow progress following Civil Rights in the 1960s.

Prominent CRT scholars like Kimberlé Crenshaw, Mari Matsuda, and Patricia Williams share an interest in recognizing racism as a quotidian component of American life (manifested in textual sources like literature, film, law, etc). In doing so, they attempt to confront the beliefs and practices that enable racism to persist while also challenging these practices in order to seek liberation from systemic racism.

As such, CRT scholarship also emphasizes the importance of finding a way for diverse individuals to share their experiences. However, CRT scholars do not only locate an individual’s identity and experience of the world in his or her racial identifications, but also their membership to a specific class, gender, nation, sexual orientation, etc. They read these diverse cultural texts as proof of the institutionalized inequalities racialized groups and individuals experience every day.

As Richard Delgado and Jean Stefancic explain in their introduction to the third edition of Critical Race Theory: The Cutting Edge, “Our social world, with its rules, practices, and assignments of prestige and power, is not fixed; rather, we construct with it words, stories and silence. But we need not acquiesce in arrangements that are unfair and one-sided. By writing and speaking against them, we may hope to contribute to a better, fairer world” (3). In this sense, CRT scholars seek tangible, real-world ends through the intellectual work they perform. This contributes to many CRT scholars’ emphasis on social activism and transforming everyday notions of race, racism, and power.

More recently, CRT has contributed to splinter groups focused on Asian American, Latino, and Indian racial experiences.  Read More