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We study the magnetic field dependence of the ground state of $S=1/2$$J_1$-$J_2$ Heisenberg model on the square lattice by the DMRG method with thesine-square deformation. We obtain 8 different phases including plaquettevalence-bond crystal with a finite spin gap, transverse N$\acute{\rm e}$el,transverse stripe, 1/2 magnetization plateau with up-up-up-down (uuud), andthree new phases we named Y-like, V-like, and $\Psi$ phases around $J_2/J_1$=0.55-0.6 depending on the magnetic field. The phase transitions to uuud andY-like states from transverse N$\acute{\rm e}$el (at $J_2/J_1$ = 0.55) andstripe (at $J_2/J_1$ = 0.6) states are discontinuous, as in the case ofspin-flop.

Field Induced Quantum Phase Transitions in $S=1/2$ $J_1$-$J_2$ Heisenberg Model on the Square Lattice