BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260909T182953Z
LAST-MODIFIED:20160322T140757Z
DTSTART:20160323T150000Z
DTEND:20160323T170000Z
UID:event1582@bu.edu
URL:http://physics.bu.edu/internal/events/show/1582
SUMMARY:Rotated Heisenberg model and its applications to cold atom systems 
	and Kitaev materials with SOC
DESCRIPTION:Featuring Jinwu Ye\, Mississippi State University\n\nPart of th
	e Condensed Matter Theory Seminar Series.\n\nAbstract:\nRecently\, there ar
	e ground breaking experimental advances in generating 2 dimensional spin-or
	bit coupling (SOC) for cold atoms in both continuum and optical lattices. I
	n materials\, there are also 5d and 4d transition metal oxides with strong 
	SOC which are so called Kitaev materials. We study  interacting spionor bos
	ons ( or fermions ) at integer ( or hall ) fillings on a square lattice in 
	the presence of the SOC. In the strong coupling limit\, it leads to Rotated
	 Ferromagnetic ( Anti-ferromagnetic ) Heisenberg model ( RFHM or RAFHM ) wh
	ich is a new class of quantum spin models with SOC. In this talk\, we only 
	focus on RFHM. For a solvable line in the SOC parameter space\, we identify
	 a new spin-orbital entangled commensurate ground state. It supports not on
	ly commensurate ( C ) magnons\, but also a new gapped elementary excitation
	: in-commensurate ( IC)  magnons with their two gap minima continuously tun
	ed by the SOC parameter. A longitudinal Zeeman field will drag out these IC
	 magnons and drive their condensations to various quantum Commensurate and 
	In-commensurate phases. These commensurate phases include two collinear sta
	tes at low and high Zeeman field\, two co-planar canted states at Mirror re
	flected SOC parameters respectively. Most importantly\, there are non-copla
	nar incommensurate Skyrmion (IC-SkX) crystal phases surrounded by the 4 com
	mensurate phases. New excitation spectra above all the 5 phases are compute
	d. Three different classes of quantum C-IC transitions from the IC-SKX to i
	ts 4 neighboring commensurate phases are identified. Then starting from the
	 results achieved along the solvable line\, we study the RFHM  in the whole
	 SOC parameter space. Its global phase diagram displays many  quantum  phen
	omena such as masses generated from "order from disorder " mechanism\, quan
	tum C and  IC skyrmion phases\, quantum Lifshitz C-IC transitions\, spiral 
	phases\, metastable states\, hysteresis\, devil staircases and fractals\, e
	tc.   Implications to cold atom systems and so called Kitaev materials with
	 SOC are discussed. Various intriguing perspectives\, especially on possibl
	e spin liquids in SOC lattice systems are outlined.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR