A new milestone has been set for levitated optomechanics as a group of scientists observed the Berry phase of electron spins in nano-sized diamonds levitated in vacuum.
A new milestone has been set for levitated optomechanics as Prof. Tongcang Li's group observed the Berry phase of electron spins in nano-sized diamonds levitated in vacuum.
The team made the diamonds rotate incredibly fast -- up to 1.2 billion times per minute! By doing this, they were able to observe how the rotation affected the spin qubits in a unique way known as the Berry phase. The authors of this paper were mostly from Purdue University and are members of Li's research group: Yuanbin Jin , Kunhong Shen , Xingyu Gao and Peng Ju . Li, Jin, Shen, and Ju conceived and designed the project and Jin and Shen built the setup. Jin subsequently performed measurements and calculations and the team collectively discussed the results.
"We can adjust the driving voltage to change the spinning direction," he explains."The levitated diamond can rotate around the z-axis , shown in the schematic, either clockwise or counterclockwise, depending on our driving signal. If we don't apply the driving signal, the diamond will spin omnidirectionally, like a ball of yarn."
"At Purdue University, we have state-of-the-art facilities for our research in levitated optomechanics," says Li."We have two specialized, home-built systems dedicated to this area of study. Additionally, we have access to the shared facilities at the Birck Nanotechnology Center, which enables us to fabricate and characterize the integrated surface ion trap on campus. We are also fortunate to have talented students and postdocs capable of conducting cutting-edge research.
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