BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Erhai Zhao\, George Mason University\n\n
Quantum spin liquids evade long-range magnetic order down to absolute zero temper ature. These anarchic\, yet highly entangled states break no symmetry but have remarkable properties such as fractional excitations. In this talk\, I will first give an example of spin liquid using \; a compass model r elevant to recently discovered honeycomb antiferromagnet NaNi2BiO6. Then I will introduce a new model\, the dipolar Heisenberg model\, motivated by recent experiments on artificial many-spin systems based on interacting di poles. I will argue that long-range magnetic \;order can be suppressed by simply tuning the direction of the dipoles using an external field.&nb sp\;The classical\, semiclassical\, and quantum phase diagram of this frus trated spin model will be presented to show an extended region where the g round state is a quantum paramagnet. By comparing to DMRG\, I will argue t hat it is likely a quantum spin liquid.
\n DTSTART:20181018T150000Z LOCATION:Physics Building\, Room 313 SUMMARY:Competing orders in a quantum spin model with long-range interactio ns END:VEVENT END:VCALENDAR