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Fernández González, C. and Schuch, N. and Wolf, M.M. and Cirac, J.I. and Pérez García, David (2015) Frustration Free Gapless Hamiltonians for Matrix Product States. Communications in Mathematical Physics, 333 (1). pp. 299333. ISSN 00103616

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Official URL: http://link.springer.com/article/10.1007%2Fs002200142173z
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http://link.springer.com  Publisher 
Abstract
For every Matrix Product State (MPS) one can always construct a socalled parent Hamiltonian. This is a local, frustration free, Hamiltonian which has the MPS as ground state and is gapped. Whenever that parent Hamiltonian has a degenerate ground state space (the socalled noninjective case), we construct another ’uncle’ Hamiltonian which is also local and frustration free, has the same ground state space, but is gapless, and its spectrum is R +. The construction is obtained by linearly perturbing the matrices building up the state in a random direction, and then taking the limit where the perturbation goes to zero. For MPS where the parent Hamiltonian has a unique ground state (the socalled injective case) we also build such uncle Hamiltonian with the same properties in the thermodynamic limit.
Item Type:  Article 

Uncontrolled Keywords:  Spin chains, Quantum 
Subjects:  Sciences > Physics > Mathematical physics Sciences > Physics > Quantum theory 
ID Code:  28340 
Deposited On:  12 Feb 2015 13:40 
Last Modified:  13 Feb 2015 13:24 
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