DD - MM - YYYY ) 2 . REPORT TYPE 3 . DATES COVERED ( From - To ) New Reprint - 4
نویسندگان
چکیده
Observation of dipolar spin-exchange interactions with lattice-confined polar molecules Report Title With the production of polar molecules in the quantum regime1, 2, long-range dipolar interactions are expected to facilitate understanding of strongly interacting many-body quantum systems and to realize lattice spin models3 for exploring quantum magnetism. In ordinary atomic systems, where contact interactions require wavefunction overlap, effective spin interactions on a lattice can be mediated by tunnelling, through a process referred to as superexchange; however, the coupling is relatively weak and is limited to nearest-neighbour interactions4, 5. In contrast, dipolar interactions exist even in the absence of tunnelling and extend beyond nearest neighbours. This allows coherent spin dynamics to persist even for gases with relatively high entropy and low lattice filling. Measured effects of dipolar interactions in ultracold molecular gases have been limited to the modification of inelastic collisions and chemical reactions6, 7. Here we use dipolar interactions of polar molecules pinned in a three-dimensional optical lattice to realize a lattice spin model. Spin is encoded in rotational states of molecules that are prepared and probed by microwaves. Resonant exchange of rotational angular momentum between two molecules realizes a spin-exchange interaction. The dipolar interactions are apparent in the evolution of the spin coherence, which shows oscillations in addition to an overall decay of the coherence. The frequency of these oscillations, the strong dependence of the spin coherence time on the lattice filling factor and the effect of a multipulse sequence designed to reverse dynamics due to two-body exchange interactions all provide evidence of dipolar interactions. Furthermore, we demonstrate the suppression of loss in weak lattices due to a continuous quantum Zeno mechanism8. Measurements of these tunnelling-induced losses allow us to determine the lattice filling factor independently. Our work constitutes an initial exploration of the behaviour of many-body spin models with direct, long-range spin interactions and lays the groundwork for future studies of many-body dynamics in spin lattices. Observation of dipolar spin-exchange interaction Approved for public release; distribution is unlimited. 61841.8-PH REPORT DOCUMENTATION PAGE (SF298) (Continuation Sheet) Continuation for Block 13
منابع مشابه
DATE ( DD - MM - YYYY ) 06 - 2010 2 . REPORT TYPE Annual 3 . DATES COVERED ( From - To ) 4 . TITLE
متن کامل
Do Not Return Your Form to the above Address . 1 . Report Date ( Dd - Mm - Yyyy ) 2 . Report Type 3 . Dates Covered
18. NUMBER
متن کاملDATE ( DD - MM - YYYY ) 2007 2 . REPORT TYPE Open Literature 3 . DATES COVERED ( From - To ) 4 . TITLE AND SUBTITLE
Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this coll...
متن کاملDate ( Dd - Mm - Yyyy ) 2 . Report Type 3 . Dates
Form Approved OMB No. 0704-0188 Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this coll...
متن کاملDo Not Return Your Form to the above Address . 1 . Report Date ( Dd - Mm - Yyyy ) 2 . Report Type 3
Prescribed by ANSI Std. Z39.18 Form Approved OMB No. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimat...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2015