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Title: Unified phase diagram of antiferromagnetic SU( N ) spin ladders

Journal Article · · Physical Review B
 [1];  [2];  [3];  [4];  [5]
  1. Ludwig-Maximilians-Univ., Munich (Germany). Physics Dept., Arnold Sommerfeld Center for Theoretical Physics, and Center for NanoScience; Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
  2. Univ. de Toulouse (France). Lab. de Physique Théorique, IRSAMC
  3. Univ. de Cergy-Pontoise, Cergy-Pontoise (France). Site de Saint-Martin
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Condensed Matter Physics and Materials Science
  5. Univ. Innsbruck (Austria). Inst. fur Theoretische Physik

Motivated by near-term experiments with ultracold alkaline-earth atoms confined to optical lattices, we establish numerically and analytically the phase diagram of two-leg SU ( N ) spin ladders. Two-leg ladders provide a rich and highly nontrivial extension of the single chain case on the way towards the relatively little explored two-dimensional situation. Focusing on the experimentally relevant limit of one fermion per site, antiferromagnetic exchange interactions, and 2 ≤ N ≤ 6, we show that the phase diagrams as a function of the interchain (rung) to intrachain (leg) coupling ratio, J/J, strongly differ for even versus odd N. For even N = 4 and 6, we demonstrate that the phase diagram consists of a single valence bond crystal (VBC) with a spatial period of N/2 rungs. For odd N = 3 and 5, we find surprisingly rich phase diagrams exhibiting three distinct phases. For weak rung coupling, we obtain a VBC with a spatial period of N rungs, whereas for strong coupling we obtain a critical phase related to the case of a single chain. In addition, we encounter intermediate phases for odd N, albeit of a different nature for N = 3 as compared to N = 5. For N = 3, we find a novel gapless intermediate phase with J-dependent incommensurate spatial fluctuations in a sizeable region of the phase diagram. For N = 5 , there are strong indications for a narrow potentially gapped intermediate phase, whose nature is not entirely clear. Lastly, our results are based on (i) field theoretical techniques, (ii) qualitative symmetry considerations, and (iii) large-scale density matrix renormalization group (DMRG) simulations keeping beyond a million of states by fully exploiting and thus preserving the SU (N) symmetry.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012704
OSTI ID:
1466592
Alternate ID(s):
OSTI ID: 1462793
Report Number(s):
BNL-207997-2018-JAAM; PRBMDO
Journal Information:
Physical Review B, Vol. 98, Issue 8; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Spontaneous Plaquette Formation in the SU(4) Spin-Orbital Ladder text January 2001
Spin ladders and quantum simulators for Tomonaga–Luttinger liquids text January 2013
Spin-Orbital Quantum Liquid on the Honeycomb Lattice text January 2012
Quantum phases of bosons in double-well optical lattices text January 2007
A Mott insulator of fermionic atoms in an optical lattice text January 2008
Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms text January 2009
Mott Insulators of Ultracold Fermionic Alkaline Earth Atoms: Underconstrained Magnetism and Chiral Spin Liquid text January 2009
The density-matrix renormalization group in the age of matrix product states text January 2010
Three-sublattice ordering of the SU(3) Heisenberg model of three-flavor fermions on the square and cubic lattices text January 2010
Probing nearest-neighbor correlations of ultracold fermions in an optical lattice text January 2010
Simultaneous dimerization and SU(4) symmetry breaking of 4-color fermions on the square lattice text January 2011
Topological liquids and valence cluster states in two-dimensional SU(N) magnets text January 2011
Spin-orbital quantum liquid on the honeycomb lattice text January 2012
Ultracold Fermi Gases with Emergent SU(N) Symmetry text January 2014
Spectroscopic observation of SU(N)-symmetric interactions in Sr orbital magnetism text January 2014
A one-dimensional liquid of fermions with tunable spin text January 2014
Variational Monte-Carlo investigation of SU($N$) Heisenberg chains text January 2015
Two-leg SU(2n) spin ladder: A low-energy effective field theory approach text January 2015
A Quantum Gas Microscope for Fermionic Atoms text January 2015
Site-resolved imaging of a fermionic Mott insulator text January 2015
Direct probing of the Mott crossover in the SU($N$) Fermi-Hubbard model text January 2015
Site-resolved measurement of the spin-correlation function in the Hubbard model text January 2016
Semi-synthetic zigzag optical lattice for ultracold bosons text January 2016
Non-perturbative methodologies for low-dimensional strongly-correlated systems: From non-abelian bosonization to truncated spectrum methods text January 2017
Generalization of the Haldane conjecture to SU(3) chains text January 2017
Spontaneous plaquette formation in the SU(4) Spin-Orbital ladder text January 2000
Magnetic phase diagram of the S=1/2 antiferromagnetic zigzag spin chain in the strongly frustrated region: cusp and plateau text January 2002
The density-matrix renormalization group text January 2004
A lattice of double wells for manipulating pairs of cold atoms text January 2006
Condensation of magnons and spinons in a frustrated ladder text January 2006
Antiferromagnetic spin ladders: crossover between spin S = 1/2 and S = 1 chains text January 1995
Entanglement in Many-Body Systems text January 2007

Cited By (3)

SU(3) fermions on the honeycomb lattice at 1 3 filling journal July 2019
Dimerization and effective decoupling in two spin-1 generalizations of the spin- 1 2 Majumdar-Ghosh chain journal September 2019
Non-Topological Majorana Zero Modes in Inhomogeneous Spin Ladders text January 2018

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