Quantum Statistical Response Functions
... For our purposes it is most useful to use a Picture intermediate between the Schrödinger and Heisenberg Pictures, called the Intermediate or Interaction Picture. In this formulation the total Hamiltionian is split into an unperturbed part H 0 and a (possibly time dependent) perturbation H ′(t) . We ...
... For our purposes it is most useful to use a Picture intermediate between the Schrödinger and Heisenberg Pictures, called the Intermediate or Interaction Picture. In this formulation the total Hamiltionian is split into an unperturbed part H 0 and a (possibly time dependent) perturbation H ′(t) . We ...
notes
... infinite number of saddle points and if one evaluates the functional integral around them up to the quadratic fluctuations and adds up all the contributions one obtains the exact result known from the operator approach. The paradoxical situation consists in the fact that although the higher fluctuat ...
... infinite number of saddle points and if one evaluates the functional integral around them up to the quadratic fluctuations and adds up all the contributions one obtains the exact result known from the operator approach. The paradoxical situation consists in the fact that although the higher fluctuat ...
PDF Version - Physics (APS)
... chain [9]. We can demonstrate and use their basic arguments to understand the random-hopping problem described above. We begin by concentrating on the strongest hopping element, tmax , and ignore everything else in the Hamiltonian as a much weaker perturbation. A fermion put in two neighboring sites ...
... chain [9]. We can demonstrate and use their basic arguments to understand the random-hopping problem described above. We begin by concentrating on the strongest hopping element, tmax , and ignore everything else in the Hamiltonian as a much weaker perturbation. A fermion put in two neighboring sites ...
The Relation Between Classical and Quantum Mechanical Rigid
... is derived by assuming the system is rigid in all but a few coordinates. Although this will not be exact for the quantum system, it may be a reasonable limit of the actual dynamics, and it is useful to know what assumptions it involves. A particular case which has received much attention is the rota ...
... is derived by assuming the system is rigid in all but a few coordinates. Although this will not be exact for the quantum system, it may be a reasonable limit of the actual dynamics, and it is useful to know what assumptions it involves. A particular case which has received much attention is the rota ...
Quantum Monte Carlo Study of two dimensional electron gas with
... What we get is two different eigenstates for each wavevector k, consisting of different k-dependent spin states with two different ...
... What we get is two different eigenstates for each wavevector k, consisting of different k-dependent spin states with two different ...
Lecture 9
... count. The energy of course is not preserved because the Hamiltonian is changed. In addition the state given by this switch-on process will eventually decay into a collection of more complicated states (e.g. by exciting particle-hole pairs out of the Fermi sea) so that there is a finite lifetime. Th ...
... count. The energy of course is not preserved because the Hamiltonian is changed. In addition the state given by this switch-on process will eventually decay into a collection of more complicated states (e.g. by exciting particle-hole pairs out of the Fermi sea) so that there is a finite lifetime. Th ...
