Degenerate Bose gases near a d-wave shape resonance

Abstract

Many unconventional quantum matters, such as fractional quantum Hall effect and d-wave high-Tc superconductor, are discovered in strongly interacting systems. Understanding quantum many-body systems with strong interaction and the unconventional phases therein is one of the most challenging problems in physics nowadays. Cold atom systems possess a natural way to create strong interaction by bringing the system to the vicinity of a scattering resonance. Although this has been a focused topic in cold atom physics for more than a decade, these studies have so far mostly been limited for s-wave resonance. Here we report the experimental observation of a broad d-wave shape resonance in degenerate 41 K gas. We further measure the molecular binding energy that splits into three branches as a hallmark of d-wave molecules, and find that the lifetime of this many-body system is reasonably long at strongly interacting regime. From analyzing the breathing mode excited by ramping through this resonance, it suggests that a quite stable low-temperature atom and molecule mixture is produced. Putting all the evidence together, our system offers great promise to reach a d-wave molecular superfluid.

Attosecond timing of electron emission from a molecular shape resonance

“…They play a crucial role in α-decay of radioactive nuclei ( 3 ), molecular fragmentation ( 4 ), rotational predissociation ( 5 ), electron detachment ( 6 ), ultracold collisions ( 7 ), low-energy electron scattering ( 8 , 9 ), and photoionization ( 10 , 11 ), to name a few. They are also thought to be at the origin of enhanced radiation damage of DNA and other biomolecules ( 12 ) and to play an important role in the stability of Bose-Einstein condensates ( 13 ). Shape resonances are usually associated to specific spectral features.…”

Observation of dipolar splittings in high-resolution atom-loss spectroscopy of Li6 p -wave Feshbach resonances

“…It is attributed to effective spin-spin (ss) interactions including the magnetic dipole-dipole interaction and the secondorder spin-orbit coupling [2]. Recently, the observation of dipolar splitting has been extended to d-wave resonances [12,13], and an additional splitting mechanism has been discovered for m l = +1 and m l = −1 due to spin-rotation interaction in p-wave FRs [14,15].…”

Microscopy of an ultranarrow Feshbach resonance using a laser-based atom collider: A quantum defect theory analysis

“…By separating the scattering problem into energy sensitive and insensitive components, QDT allows for an elegant description of resonance interactions, with the energy dependence encapsulated in a few analytic parameters. Recent demonstrations of the power of QDT include the prediction and interpretation of triplet structures for d-wave Feshbach resonances [16] and shape resonances [17].…”